Battery cell, battery and electric device

Abstract

The utility model discloses a single battery, a battery and a power utilization device, the single battery comprises a shell and an air suction assembly, the shell is provided with a containing cavity, and the air suction assembly is arranged in the containing cavity. The air suction assembly can be started and absorb air in the containing cavity when the pressure intensity of the containing cavity reaches a threshold value. By arranging the gas suction assembly, gas generated in the operation process of the battery monomer can be absorbed, the risk of deformation of a shell of the battery monomer caused by increase of the gas amount in the accommodating cavity is reduced, and the operation stability of the battery monomer is improved. Moreover, the air suction assembly is opened only when the pressure intensity reaches a threshold value, so that the waste of an adsorption material caused by the fact that the air suction assembly sucks air by mistake in the assembly process of the battery monomers can be reduced, and the utilization rate of the adsorption material and the adsorption efficiency of redundant gas in the accommodating cavity are improved.

Description

Technical Field

[0001] This application relates to the field of batteries, and particularly to a battery cell, a battery, and an electrical device. Background Art

[0002] Batteries are widely used in electronic devices, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, electric tools, and energy storage systems, etc.

[0003] During the operation of a battery cell, gas is generated. An increase in the amount of gas will cause deformation of the outer shell of the battery cell. Therefore, the above structure needs to be improved. Summary of the Utility Model

[0004] In view of the above problems, this application provides a battery cell, a battery, and an electrical device, which can absorb the gas inside the outer shell of the battery cell, reduce the deformation of the outer shell of the battery cell caused by excessive gas inside the shell, and thus improve the operating stability of the battery cell.

[0005] In a first aspect, this application provides a battery cell, including an outer shell and an air intake assembly. The outer shell has a receiving cavity, and the air intake assembly is arranged in the receiving cavity. The air intake assembly can be opened and absorb the gas in the receiving cavity when the pressure in the receiving cavity reaches a threshold value.

[0006] In the technical solution of the embodiments of this application, by setting the air intake assembly, the gas generated during the operation of the battery cell can be absorbed, the risk of deformation of the outer shell of the battery cell caused by an increase in the gas volume in the receiving cavity can be reduced, and the operating stability of the battery cell can be improved. Moreover, the air intake assembly is only opened when the pressure reaches the threshold value, which can reduce the waste of the adsorption material caused by the air intake assembly accidentally inhaling air during the assembly process of the battery cell, improve the utilization rate of the adsorption material, and the adsorption efficiency of the excess gas in the receiving cavity.

[0007] In some embodiments, the battery cell further includes an electrode assembly. The electrode assembly includes a straight portion and bent portions connected to both ends of the straight portion. The air intake assembly is arranged between the bent portion and the outer shell. In the above structure, the space between the bent portion and the outer shell is relatively large in volume compared to the space at other positions, which is suitable for the arrangement of the air intake assembly. At the same time, the internal space of the outer shell is fully utilized, the extra space occupied by the air intake assembly is reduced, the space utilization rate is improved, and the energy density of the battery cell is increased.

[0008] In some embodiments, the number of the air intake assemblies is four, and the four air intake assemblies are arranged at intervals along the circumferential direction of the electrode assembly. In the above structure, by setting multiple air intake assemblies, the air intake volume can be increased. By arranging the multiple air intake assemblies at intervals along the circumferential direction of the electrode assembly, the gas can be adsorbed from multiple directions, the risk of local gas accumulation in the receiving cavity can be reduced, and the gas adsorption efficiency can be improved.

[0009] In some embodiments, the battery cell further includes a plurality of electrode assemblies, the plurality of electrode assemblies are stacked in the accommodation cavity, and at least one gas suction assembly is disposed between any two adjacent electrode assemblies. In the above structure, arranging a plurality of electrode assemblies in the accommodation cavity can improve the energy density of the battery cell. Disposing the gas suction assembly between two electrode assemblies can reduce the distance between the gas suction assembly and the electrode assemblies and improve the gas adsorption efficiency.

[0010] In some embodiments, the gas suction assembly is further disposed between the electrode assembly and the housing. In the above structure, adding a gas suction assembly between the housing and the electrode assembly adsorbs the gas between the electrode assembly and the housing, improving the adsorption efficiency.

[0011] In some embodiments, the gas suction assembly includes a sealing shell, a valve plate, and an adsorption material. The sealing shell is disposed in the accommodation cavity, the sealing shell is provided with a gas suction port, and the sealing shell has an inner cavity. The valve plate covers the gas suction port and is sealingly connected to the sealing shell, and the valve plate has a weak part. The weak part can be broken under a certain pressure. The adsorption material is disposed in the inner cavity. Among them, the rupture of the valve plate communicates the inner cavity with the accommodation cavity, so that the adsorption material absorbs the gas in the accommodation cavity. In the above structure, the adsorption material can react with the gas in the accommodation cavity and absorb the gas, reducing the pressure in the accommodation cavity and reducing the risk of deformation of the housing. The sealing shell is used to accommodate the adsorbed gas, and at the same time, the sealing shell can reduce the risk of waste caused by the adsorption material accidentally adsorbing air during the assembly process. The weak part is provided on the valve plate, which can control the opening of the valve plate according to the pressure in the accommodation cavity, realizing the automatic opening of the sealing shell and improving the utilization efficiency of the adsorption material.

[0012] In some embodiments, the cross-sectional contour shape of the sealing shell is any one of a triangle, a circle, an ellipse, a rhombus, a square, or a rectangle. The above structure can facilitate the arrangement of the gas suction assembly.

[0013] In some embodiments, the adsorption material includes at least one of a zirconium-based alloy, a magnesium-based alloy, a rare earth alloy, a titanium-based alloy, activated carbon, zinc oxide, a nanocrystalline oxide, aluminum oxide, silica gel, polyvinyl alcohol, activated carbon, or zeolite. The above materials have high adsorption efficiency and are easy to obtain.

[0014] In some embodiments, the outer casing includes an end cap and a housing. A pressure relief mechanism is provided on the end cap, and the valve opening threshold of the pressure relief mechanism is higher than that of the air intake assembly. The air intake assembly is disposed between the housing and the electrode assembly. In the above structure, the pressure relief mechanism is provided and is opened when the gas inside the battery cell reaches the threshold, reducing the risk of combustion and explosion of the battery cell and the damage to surrounding personnel or equipment caused by the combustion and explosion of the battery cell. Moreover, the air intake assembly is opened prior to the pressure relief mechanism, capable of absorbing at least part of the gas inside the accommodation chamber, prolonging the valve opening time of the battery cell, and improving the operating stability of the battery cell.

[0015] In a second aspect, the present application provides a battery, which includes the battery cell in the above embodiments.

[0016] In a third aspect, the present application provides an electrical device, which includes the battery in the above embodiments, and the battery is used to provide electrical energy.

[0017] The above description is only an overview of the technical solutions of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. 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 implementation manners of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The features, advantages, and technical effects of the exemplary embodiments of the present application will be described below with reference to the drawings.

[0019] Figure 1 Schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0020] Figure 2 Explosion schematic diagram of a battery provided in some embodiments of the present application;

[0021] Figure 3 Schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0022] Figure 4 Schematic structural diagram of an electrode assembly and an air intake assembly provided in some embodiments of the present application;

[0023] Figure 5 Schematic structural diagram of an electrode assembly and an air intake assembly provided in some other embodiments of the present application;

[0024] Figure 6 Schematic structural diagram of an electrode assembly and an air intake assembly provided in some other embodiments of the present application;

[0025] Figure 7 Schematic structural diagram of an electrode assembly and an air intake assembly provided in some other embodiments of the present application;

[0026] Figure 8 Structural schematic diagram of the air intake component for some embodiments of the present application;

[0027] Figure 9 Structural schematic diagram of the air intake component for other embodiments of the present application.

[0028] Detailed description of the reference numerals:

[0029] 1. Vehicle; 2. Battery; 10. Electrode assembly; 101. Straight part; 102. Bent part; 20. Housing; 21. Accommodation cavity; 24. Pressure relief mechanism; 25. Electrode terminal; 30. End cover; 40. Outer shell; 3. Controller; 4. Motor; 5. Box body; 51. First box body part; 52. Second box body part; 53. Accommodation space; 6. Air intake component; 601. Sealing shell; 602. Valve plate; 603. Adsorption material; 604. Inner cavity; 7. Battery cell. Specific embodiments

[0030] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to illustrate the technical solutions of the present application more clearly, so they are only examples and cannot be used to limit the protection scope of the present application.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present application belongs; the terms used herein 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 drawings are intended to cover non-exclusive inclusion.

[0032] In the description of the embodiments of the present application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order or primary-secondary relationship of the indicated technical features. In the description of the embodiments of the present application, "a plurality" means more than two unless otherwise specifically defined.

[0033] Referring to "embodiments" herein means that the 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 places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0034] In the description of the embodiments of the present application, the term "and / or" is merely a relational description of associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in this document, the character " / " generally represents an "or" relationship between the associated objects before and after.

[0035] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two). Similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0036] In the description of the embodiments of the present application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is 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. Therefore, it should not be construed as a limitation to the embodiments of the present application.

[0037] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. 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.

[0038] In the present application, the term "and / or" is merely a relational description of associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Additionally, in the present application, the character " / " generally represents an "or" relationship between the associated objects before and after.

[0039] In the embodiments of the present application, the same reference numerals represent the same components. And for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components shown in the drawings in the embodiments of the present application, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to the present application.

[0040] The "plurality" mentioned in the present application refers to two or more (including two).

[0041] During the charge and discharge process of a battery cell, gases are generated inside the battery cell due to factors such as redox reactions between the electrolyte and the active material, decomposition of the SEI film, or oxidation reactions between the active oxygen released by the decomposition of the positive electrode material at high temperatures and the electrolyte. The interior of the outer shell of the battery cell is usually a sealed structure, and the accumulation of gases inside the outer shell causes an increase in the pressure in the accommodation cavity. The increase in pressure can lead to deformation of the outer shell, a decrease in the capacity of the battery cell, and a reduction in the charge and discharge efficiency, etc.

[0042] To reduce the above-mentioned hazards caused by the increase in gases inside the battery cell, an embodiment of the present application provides a battery cell with an air intake assembly provided therein, which can absorb the gases generated during the operation of the battery cell, reduce the risk of deformation of the outer shell of the battery cell caused by the increase in the amount of gases in the accommodation cavity, and improve the operating stability of the battery cell. Moreover, the air intake assembly only opens when the pressure reaches a threshold value, which can reduce the waste of the adsorption material caused by the accidental inhalation of air during the assembly of the battery cell, and improve the utilization rate of the adsorption material and the adsorption efficiency of the excess gases in the accommodation cavity.

[0043] The battery cell of the embodiment of the present application will be introduced in detail below.

[0044] In the embodiment of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging after discharging to continue use.

[0045] The battery cell can include, but is not limited to, lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium-metal battery cells, sodium-metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-metal hydride battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc.

[0046] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, or a battery cell of other shapes. The prismatic battery cell includes a square-shell battery cell, a blade-shaped battery cell, a multi-prismatic battery, and the multi-prismatic battery is, for example, a hexagonal prism battery, etc. There is no special limitation in the present application.

[0047] The battery mentioned in the embodiment of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0048] In some embodiments, the battery can be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0049] In some embodiments, the battery can be a battery pack, and the battery pack includes a box body and battery cells, and the battery cells or battery modules are accommodated in the box body.

[0050] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can form at least part of the floor of the vehicle, or part of the box body can form at least part of the cross beams and longitudinal beams of the vehicle.

[0051] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage electrical cabinet, etc.

[0052] The battery disclosed in the embodiments of the present application can be used in electrical devices that use the battery as a power source or various energy storage systems that use the battery as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet computer, a laptop computer, an electric toy, an electric tool, a battery car, an electric vehicle, a ship, a spacecraft, and so on. Among them, the electric toy can include a fixed or mobile electric toy. For example, a game console, an electric vehicle toy, an electric ship toy, an electric aircraft toy, etc. The spacecraft can include an airplane, a rocket, a space shuttle, a spaceship, and so on.

[0053] For the convenience of description in the following embodiments, the electrical device is taken as a vehicle as an example for description.

[0054] Figure 1 It is a schematic structural diagram of a vehicle provided in some embodiments of the present application.

[0055] As Figure 1 shown, a battery 2 is disposed inside the vehicle 1. The battery 2 can be disposed at the bottom, head, or tail of the vehicle 1. The battery 2 can be used for power supply of the vehicle 1. For example, the battery 2 can be used as the operating power source of the vehicle 1.

[0056] The vehicle 1 may further include a controller 3 and a motor 4. The controller 3 is used to control the battery 2 to supply power to the motor 4. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1.

[0057] In some embodiments of the present application, the battery 2 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, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0058] Figure 2 It is an exploded view of the battery provided in some embodiments of the present application. As Figure 2 shown, the battery 2 includes a box body 5 and battery cells 7. The battery cells 7 are accommodated in the box body 5.

[0059] The housing 5 is used to accommodate battery cells 7, and the housing 5 can have various structures. In some embodiments, the housing 5 can include a first housing part 51 and a second housing part 52. The first housing part 51 and the second housing part 52 cover each other, and the first housing part 51 and the second housing part 52 jointly define an accommodation space 53 for accommodating the battery cells. The second housing part 52 can be a hollow structure with one end open, and the first housing part 51 is a plate-like structure. The first housing part 51 covers the open side of the second housing part 52 to form the housing 5 with the accommodation space 53; both the first housing part 51 and the second housing part 52 can also be hollow structures with one side open, and the open side of the first housing part 51 covers the open side of the second housing part 52 to form the housing 5 with the accommodation space 53. Of course, the first housing part 51 and the second housing part 52 can have various shapes, such as a cylinder, a cuboid, etc.

[0060] To improve the sealing performance after the connection between the first housing part 51 and the second housing part 52, a sealing member can also be provided between the first housing part 51 and the second housing part 52, such as sealant, sealing ring, etc.

[0061] Assuming that the first housing part 51 covers the top of the second housing part 52, the first housing part 51 can also be called the upper cover, and the second housing part 52 can also be called the lower housing.

[0062] In the battery 2, there can be one or multiple battery cells 7. If there are multiple battery cells 7, they can be connected in series, parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells 7. The multiple battery cells 7 can be directly connected in series, parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells 7 is accommodated in the housing 5; of course, it can also be that multiple battery cells are first connected in series, parallel, or in a mixed connection to form battery modules, and then multiple battery modules are connected in series, parallel, or in a mixed connection to form a whole and are accommodated in the housing 5.

[0063] Exemplarily, the battery cell 7 can be the smallest unit that makes up the battery 2.

[0064] Figure 3 It is an exploded view of the battery cell provided in some embodiments of the present application.

[0065] As Figure 3 shown, in some embodiments, the battery cell 7 includes a housing 40 and an electrode assembly 10 accommodated in the housing 40.

[0066] In some embodiments, the battery cell 7 further includes an electrolyte accommodated in the housing 40. The electrolyte plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid.

[0067] In some embodiments, the battery cell 7 includes an electrode terminal 25. The electrode terminal 25 is electrically connected to the electrode assembly 10 for outputting or inputting electrical energy of the battery cell 7.

[0068] Please refer to Figures 3 to 5 , Figure 3 , which is a schematic structural diagram of the battery cell 7 provided in some embodiments of the present application. Figure 4 , which is a schematic structural diagram of the electrode assembly 10 and the gas absorption assembly 6 provided in some embodiments of the present application. Figure 5 , which is a schematic structural diagram of the electrode assembly 10 and the gas absorption assembly 6 provided in some other embodiments of the present application.

[0069] As shown in the figure, the battery cell 7 of the embodiments of the present application includes: a housing 40 and a gas absorption assembly 6. The housing 40 has a receiving cavity 21, and the gas absorption assembly 6 is disposed in the receiving cavity 21. The gas absorption assembly 6 can be opened when the pressure in the receiving cavity 21 reaches a threshold value and absorb the gas in the receiving cavity 21.

[0070] The housing 40 is used to encapsulate components such as the electrode assembly 10 and the electrolyte. The housing 40 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite housing 40), or an aluminum-plastic film, etc.

[0071] In the technical solution of the embodiments of the present application, by providing the gas absorption assembly 6, the gas generated during the operation of the battery cell 7 can be absorbed, reducing the risk of deformation of the housing 40 of the battery cell 7 caused by an increase in the gas volume in the receiving cavity 21, and improving the operating stability of the battery cell 7. Moreover, the gas absorption assembly 6 is only opened when the pressure reaches the threshold value, which can reduce the waste of the adsorption material caused by accidentally inhaling air during the assembly of the battery cell 7, improving the utilization rate of the adsorption material and the adsorption efficiency of the excess gas in the receiving cavity 21.

[0072] In some embodiments of the present application, the battery cell 7 further includes an electrode assembly 10. The electrode assembly 10 includes a flat portion 101 and bent portions 102 connected to both ends of the flat portion 101. The gas absorption assembly 6 is disposed between the bent portion 102 and the housing 40.

[0073] The electrode assembly 10 includes a positive electrode plate and a negative electrode plate. During the charging and discharging process of the battery cell 7, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode plate and the negative electrode plate. Optionally, the electrode assembly 10 further includes a separator disposed between the positive electrode plate and the negative electrode plate. The separator can reduce the risk of short circuit between the positive and negative electrode plates and allow active ions to pass through at the same time.

[0074] A plurality of positive electrode plates, separators, and negative electrode plates are stacked and wound around an axis to form an electrode element, and the electrode element is pressed to form an electrode assembly 10 with a cross-section similar to a runway shape. The middle part of the electrode assembly 10 that is pressed forms a flat part 101, and both sides of the flat part 101 are connected by bending parts 102.

[0075] In the above structure, the space between the bending part 102 and the housing 40 is relatively larger than the space at other positions. Such a design enables the air intake assembly 6 to be more easily placed in this area without requiring additional space. By making full use of the space inside the housing 40, the additional space occupied by the air intake assembly 6 is reduced, thereby improving the space utilization rate of the entire battery cell 7. The improvement of the space utilization rate further brings an increase in the energy density of the battery cell 7. The energy density is one of the important indicators of the performance of the battery 2, which represents the energy that the battery 2 can store per unit volume or per unit mass. Therefore, increasing the energy density means that the battery 2 can store more energy under the same volume or mass, thereby improving the performance and efficiency of the battery 2.

[0076] As Figure 5 shown, in some embodiments of the present application, the number of the air intake assemblies 6 is four, and the four air intake assemblies 6 are arranged at intervals along the circumferential direction of the electrode assembly 10.

[0077] In some alternative embodiments, the number of the air intake assemblies 6 is two or three, and the two or three air intake assemblies 6 are arranged at intervals along the circumferential direction of the electrode assembly 10.

[0078] In the above structure, by setting four air intake assemblies 6, compared with a single or a small number of air intake assemblies 6, the overall air intake volume can be increased. The design of multiple air intake assemblies 6 can effectively absorb the gas generated by the battery cell 7 and reduce their impact on the operation of the battery cell 7. Arranging the four air intake assemblies 6 at intervals along the circumferential direction of the electrode assembly 10 can simultaneously adsorb gas from different positions of the battery cell 7. Such a layout can adsorb gas from multiple directions simultaneously, preventing the gas from excessively accumulating at a certain position in the accommodation cavity 21. Local gas accumulation may cause uneven pressure distribution inside the battery cell 7, which may further damage the battery 2. The simultaneous operation of the four air intake assemblies 6 can cover a larger area, thereby improving the efficiency of gas adsorption. Compared with the traditional single air intake assembly 6, this design can absorb and discharge the gas inside the battery 2 faster and maintain the stability of the internal environment of the battery 2.

[0079] As Figure 6 shown, in some embodiments of the present application, the battery cell 7 further includes a plurality of electrode assemblies 10, the plurality of electrode assemblies 10 are stacked in the accommodation cavity 21, and at least one air intake assembly 6 is arranged between any two adjacent electrode assemblies 10.

[0080] Optionally, the number of battery 2 components is N, where N is an integer greater than or equal to 2. Exemplarily, N can be: 2, 3, 4, or 5. The number of air intake components 6 is M, where 1 ≤ M ≤ (N - 1) * 2.

[0081] Exemplarily, Figure 6 There are three electrode components 10, and the number M of the air intake components 6 can be 1, 2, 3, or 4. The design of arranging the air intake components 6 between adjacent electrode components 10 has flexibility. According to the specific requirements of the battery cell 7, the number and position of the air intake components 6 can be adjusted to optimize the gas adsorption efficiency and the performance of the battery 2.

[0082] In the above structure, by stacking multiple electrode components 10 in the accommodation cavity 21, the internal space of the battery cell 7 can be fully utilized, so that more energy can be stored under the same volume, thereby increasing the energy density of the battery 2.

[0083] Placing the air intake component 6 close to the electrode component 10 can quickly sense and respond to the pressure change around the electrode component 10, thereby quickly starting the adsorption process and reducing the risk of gas accumulation inside the battery 2. The accumulation of gas inside the battery 2 may cause the internal pressure of the battery 2 to increase, which may in turn lead to safety problems such as the expansion, leakage, or even explosion of the battery cell 7. By arranging the air intake components 6 between adjacent electrode components 10, the generated gas can be adsorbed and removed in a timely manner, reducing the internal pressure of the battery cell 7 and improving the safety of the battery cell 7.

[0084] Arranging multiple electrode components 10 in the accommodation cavity 21 can increase the energy density of the battery cell 7. Placing the air intake component 6 between two electrode components 10 can reduce the distance between the air intake component and the electrode component 10 and improve the gas adsorption efficiency.

[0085] As Figure 7 shown, in some embodiments of the present application, the air intake component 6 is also arranged between the electrode component 10 and the housing 40.

[0086] In the above structure, by adding the air intake component 6 between the electrode component 10 and the housing 40, there is also an air intake component 6 for gas adsorption in the area between the electrode component 10 and the housing 40. This design can cover more space inside the battery cell 7, thereby improving the overall gas adsorption efficiency.

[0087] As Figure 8 and Figure 9As shown, in some embodiments of the present application, the air suction assembly 6 includes a sealing shell 601, a valve sheet 602, and an adsorption material 603. The sealing shell 601 is disposed in the accommodation cavity 21. An air suction port is provided on the sealing shell 601, and the sealing shell 601 has an inner cavity 604. The valve sheet 602 covers the air suction port and is sealingly connected to the sealing shell 601. The valve sheet 602 has a weak part. The weak part can rupture under a certain pressure. The adsorption material 603 is disposed in the inner cavity 604. Wherein, when the valve sheet 602 ruptures, the inner cavity 604 communicates with the accommodation cavity 21, so that the adsorption material 603 absorbs the gas in the accommodation cavity 21.

[0088] In the above structure, the sealing shell 601, as the main structural component for accommodating the adsorption material 603, is disposed in the accommodation cavity 21, so that the gas absorption process is carried out in a closed environment. The air suction port on the sealing shell 601 is the channel for gas to enter the inner cavity 604, and can effectively prevent gas leakage when the valve sheet 602 does not rupture.

[0089] The valve sheet 602 covers the air suction port and is sealingly connected to the sealing shell 601. In the initial state, the inner cavity 604 is isolated from the accommodation cavity 21. The weak part can rupture under a certain pressure, thereby opening the air suction port and communicating the inner cavity 604 with the accommodation cavity 21. This design enables the air suction assembly 6 to automatically open according to the pressure in the accommodation cavity 21 without external intervention.

[0090] Exemplarily, the valve sheet 602 can be made of a metal sheet or an organic material. The weak part can be a thickness-reduced area provided on the metal sheet. Annular or cross-line grooves can be provided on the metal sheet or the organic material sheet, and the thickness at the grooves is less than that of other areas. After being subjected to pressure, the valve sheet 602 ruptures along the annular groove or the groove at the cross-line, thereby communicating the inner cavity 604 with the accommodation cavity 21.

[0091] The adsorption material 603 is the core part of the air suction assembly 6, and it can react with the gas in the accommodation cavity 21 and absorb the gas. This helps to reduce the pressure in the accommodation cavity 21 and further reduces the risk of deformation of the housing 20.

[0092] The adsorption material 603 is disposed in the inner cavity 604 of the sealing shell 601, ensuring its effective contact with the gas and improving the absorption efficiency. The weak part controls the opening of the valve sheet 602 according to the pressure in the accommodation cavity 21, realizing the automatic opening of the sealing shell 601 and improving the utilization efficiency of the adsorption material.

[0093] In some embodiments of the present application, the profile shape of the cross-section of the sealing shell 601 is any one of a triangle, a circle, an ellipse, a rhombus, a square, or a rectangle. The above structure can facilitate the setting of the air suction assembly. Exemplarily, Figure 8The sealed housing 601 therein is cylindrical with a circular cross-section. Figure 9 The sealed housing 601 therein is triangular prism-shaped with a triangular cross-section.

[0094] In some embodiments of the present application, the adsorption material 603 includes at least one of zirconium-based alloy, magnesium-based alloy, rare earth alloy, titanium-based alloy, activated carbon, zinc oxide, nanocrystalline oxide, alumina, silica gel, polyvinyl alcohol, activated carbon or zeolite.

[0095] In the above technical solution, alloy materials usually have high chemical activity and a large specific surface area, and can effectively adsorb and react with certain components in the gas, such as oxygen, nitrogen, hydrogen, etc. They are often used in the gas absorption process of high vacuum and ultra-high vacuum systems.

[0096] Activated carbon is a porous carbonaceous material with an extremely high specific surface area and adsorption capacity. It can adsorb various gases inside the housing 40, such as carbon monoxide and ethylene. Oxide materials usually have excellent chemical stability and thermal stability, and can adsorb and react with certain harmful components in the gas, such as sulfides, nitrogen oxides, and ethylene, etc. Silica gel is a porous silicic acid gel with good hygroscopicity and thermal stability. It can adsorb moisture and other polar substances in the gas. Polyvinyl alcohol is a polymer material with excellent hygroscopicity and film-forming properties. It can remove moisture and gases in the housing 40, such as ethylene and methane, through physical adsorption and chemical adsorption. Zeolite is a natural or synthetic porous silicate material with excellent adsorption performance and ion exchange ability. It can adsorb and remove moisture and gases in the gas, such as ethylene and methane, etc.

[0097] In some embodiments of the present application, the housing 40 includes an end cap 30 and a housing body 20. A pressure relief mechanism 24 is provided on the end cap 30. The opening threshold of the pressure relief mechanism 24 is higher than the opening threshold of the gas absorption assembly 6. The gas absorption assembly 6 is disposed between the housing body 20 and the electrode assembly 10.

[0098] In some embodiments, the housing 40 includes a housing body 20 and an end cap 30. The housing body 20 has an opening, and the end cap 30 is used to cover the opening.

[0099] The housing body 20 is a component for cooperating with the end cap 30 to form the internal cavity of the battery cell 7. The formed internal cavity can be used to accommodate the electrode assembly 10, the electrolyte, and other components.

[0100] The housing body 20 and the end cap 30 can be independent components. Exemplarily, an opening can be provided on the housing body 20, and the end cap 30 is covered at the opening to form the internal cavity of the battery cell 7.

[0101] The end cap 30 is connected to the housing 20 by welding, bonding, snap - fitting or other means.

[0102] In some embodiments, the battery cell 7 includes a pressure - relief mechanism 24. The pressure - relief mechanism 24 is configured to rupture when the internal pressure of the battery cell 7 exceeds a threshold value, so as to release the internal pressure of the battery cell 7. The pressure - relief mechanism 24 is generally disposed on the outer shell 40 and forms a sealed connection with the outer shell 40. The pressure - relief mechanism 24 plays an important role in the stable operation of the battery cell 7. For example, when short - circuit, over - charge and other phenomena occur, it may cause thermal runaway inside the battery cell 7, resulting in a sudden increase in pressure. In this case, the internal pressure can be released outward through the actuation of the pressure - relief mechanism 24 to prevent the battery cell 7 from exploding or catching fire.

[0103] Specifically, the pressure - relief mechanism 24 can be an element or component that is actuated when the battery cell 7 reaches certain conditions. Exemplarily, the pressure - relief mechanism 24 can be an element or component that is actuated to release the internal pressure and internal substances when the internal pressure or internal temperature of the battery cell 7 reaches a predetermined threshold value. This threshold value is designed differently according to design requirements, and this threshold value may depend on one or several materials of the positive electrode tab, negative electrode tab, electrolyte and separator in the battery cell 7.

[0104] The pressure - relief mechanism 24 can be in the form of, for example, an explosion - proof valve, a gas valve, a pressure - relief valve or a safety valve, etc., and can specifically adopt a pressure - sensitive element or structure. That is, when the internal pressure of the battery cell 7 reaches a predetermined threshold value, the pressure - relief mechanism 24 performs an action or a weak part provided in the pressure - relief mechanism 24 ruptures, thereby forming an opening or channel for the internal pressure to be released. Optionally, the pressure - relief mechanism 24 can also adopt a temperature - sensitive element or structure. That is, when the internal temperature of the battery cell 7 reaches a predetermined threshold value, the pressure - relief mechanism 24 performs an action, thereby forming an opening or channel for the internal pressure to be released. Optionally, the pressure - relief mechanism 24 can also be a component that can be actively actuated. Exemplarily, the pressure - relief mechanism 24 can be actuated when receiving a control signal of the battery 2.

[0105] The "actuation" mentioned in this application refers to a certain state in which the pressure - relief mechanism 24 generates an action or is activated, so that the internal pressure of the battery cell 7 can be released. The actions generated by the pressure - relief mechanism 24 can include: at least a part of the pressure - relief mechanism 24 ruptures, breaks, is torn or opened, etc. When the pressure - relief mechanism 24 is actuated, the high - temperature and high - pressure substances inside the battery cell 7 are discharged outward from the actuated part as emissions. In this way, the battery cell 7 can be depressurized under a controllable pressure, thus avoiding potential more serious accidents.

[0106] In the above structure, the pressure relief mechanism 24 is opened when the gas inside the battery cell 7 reaches a set threshold, allowing the internal gas to escape, thereby reducing the internal pressure of the battery cell 7 and preventing combustion or explosion caused by excessive pressure. The valve opening threshold is set higher than that of the gas suction component 6 to ensure that when the internal pressure of the battery cell 7 gradually increases, the gas suction component 6 starts to work first, absorbs part of the gas, and reduces the internal pressure.

[0107] The gas suction component 6 is arranged between the housing 20 and the electrode assembly 10, and can absorb the gas generated inside the battery cell 7 to further reduce the internal pressure. The gas suction component 6 is opened prior to the pressure relief mechanism 24. By absorbing at least part of the gas inside the accommodation cavity 21, the valve opening time of the battery cell 7 is extended, providing more safety buffer time for the battery cell 7. The materials used in the gas suction component 6 (such as zirconium-based alloys, magnesium-based alloys, activated carbon, etc.) have the characteristics of high adsorption efficiency and easy availability, and can effectively remove the harmful gases inside the battery cell 7.

[0108] The pressure relief mechanism 24 is provided to be opened when the gas inside the battery cell 7 reaches the threshold, reducing the risk of combustion and explosion of the battery cell 7 and the damage to surrounding personnel or equipment caused by the combustion and explosion of the battery cell 7. Moreover, the gas suction component 6 is opened prior to the pressure relief mechanism 24, which can absorb at least part of the gas inside the accommodation cavity 21, extend the valve opening time of the battery cell 7, and improve the operating stability of the battery cell 7.

[0109] In some alternative embodiments of the present application, the battery cell 7 includes a housing 40 and a gas suction component 6. The housing 40 has an accommodation cavity 21, and the gas suction component 6 is arranged in the accommodation cavity 21. The gas suction component 6 can be opened when the pressure in the accommodation cavity 21 reaches the threshold and absorb the gas in the accommodation cavity 21. The battery cell 7 further includes an electrode assembly 10. The electrode assembly 10 includes a straight portion 101 and bent portions 102 connected to both ends of the straight portion 101. The gas suction component 6 is arranged between the bent portion 102 and the housing 40. The battery cell 7 further includes a plurality of electrode assemblies 10. The plurality of electrode assemblies 10 are stacked in the accommodation cavity 21, and at least one gas suction component 6 is arranged between any two adjacent electrode assemblies 10. The gas suction component 6 includes a sealing shell 601, a valve plate 602, and an adsorption material 603. The sealing shell 601 is arranged in the accommodation cavity 21. The sealing shell 601 is provided with a gas suction port, and the sealing shell 601 has an inner cavity 604. The valve plate 602 covers the gas suction port and is hermetically connected to the sealing shell 601. The valve plate 602 has a weak portion. The weak portion can be broken under a certain pressure. The adsorption material 603 is arranged in the inner cavity 604. The adsorption material 603 includes at least one of zirconium-based alloys, magnesium-based alloys, rare earth alloys, titanium-based alloys, activated carbon, zinc oxide, nanocrystalline oxides, alumina, silica gel, polyvinyl alcohol, activated carbon, or zeolites.

[0110] Embodiments of the present application provide a battery 2, which includes the battery cell 7 in the above embodiments. Embodiments of the present application also provide an electrical device, which includes the battery 2 in the above embodiments, and the battery 2 is used to provide electrical energy. Both the battery 2 and the electrical device include the battery cell 7 in the above embodiments. An air suction component 6 is provided in the battery cell 7, which can absorb the gas generated during the operation of the battery cell 7, reduce the risk of deformation of the outer shell 40 of the battery cell 7 caused by the increase in the gas volume in the accommodation cavity 21, and improve the operation stability of the battery cell 7. Moreover, the air suction component 6 is opened only when the pressure reaches the threshold value, which can reduce the waste of the adsorption material caused by the accidental inhalation of air during the assembly of the battery cell 7, and improve the utilization rate of the adsorption material and the adsorption efficiency of the excess gas in the accommodation cavity 21.

[0111] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the 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 embodiments of the present application, and they should all be covered by 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 that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that, Comprising: A housing having a receiving cavity; An air suction assembly disposed in the receiving cavity, the air suction assembly being capable of opening and sucking the gas in the receiving cavity when the pressure in the receiving cavity reaches a threshold value. The air suction assembly includes: A sealed housing disposed in the receiving cavity, the sealed housing being provided with an air suction port and having an inner cavity; A valve plate covering the air suction port and sealingly connected to the sealed housing, the valve plate having a weak portion that can be broken under a certain pressure; An adsorption material disposed in the inner cavity; Wherein, when the valve plate is broken, the inner cavity is communicated with the receiving cavity so that the adsorption material absorbs the gas in the receiving cavity.

2. The battery cell according to claim 1, wherein The battery cell further includes an electrode assembly, the electrode assembly including a straight portion and bent portions connected to both ends of the straight portion, and the air suction assembly is disposed between the bent portion and the housing.

3. The battery cell according to claim 2, characterized in that, The number of the air suction assemblies is four, and the four air suction assemblies are arranged at intervals along the circumferential direction of the electrode assembly.

4. The battery cell according to claim 1, characterized in that, The battery cell further includes a plurality of electrode assemblies, the plurality of electrode assemblies are stacked in the receiving cavity, and at least one air suction assembly is disposed between any two adjacent electrode assemblies.

5. The battery cell according to claim 4, wherein The air suction assembly is further disposed between the electrode assembly and the housing.

6. The battery cell according to claim 5, wherein, The cross-sectional contour shape of the sealed housing is any one of a triangle, a circle, an ellipse, a rhombus, a square or a rectangle.

7. The battery cell according to claim 5, wherein, The adsorption material includes at least one of a zirconium-based alloy, a magnesium-based alloy, a rare earth alloy, a titanium-based alloy, activated carbon, zinc oxide, a nanocrystal oxide, alumina, silica gel, polyvinyl alcohol, activated carbon or zeolite.

8. The battery cell according to any one of claims 2-5, characterized in that, The housing includes an end cap and a housing body, the end cap is provided with a pressure relief mechanism, the opening threshold value of the pressure relief mechanism is higher than the opening threshold value of the air suction assembly, and the air suction assembly is disposed between the housing body and the electrode assembly.

9. A battery, characterized in that, Comprising the battery cell according to any one of claims 1-8.

10. An electrical device, characterized in that, The electrical device includes the battery according to claim 9, and the battery is used to provide electrical energy.

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