Battery monomer, battery device and power utilization device

Abstract

The invention provides a battery monomer, a battery device and a power utilization device, and relates to the technical field of batteries, and the battery monomer comprises a shell, an electrode assembly and an exhaust valve. The shell comprises an end cover and a shell body, the shell body is provided with a containing space and an opening communicated with the containing space, and the end cover covers the opening. The electrode assembly is arranged in the accommodating space. The exhaust valve is arranged on the shell and provided with an exhaust port. The exhaust valve comprises an open state and a closed state, when the internal pressure of the battery monomer is greater than or equal to a preset threshold value, the exhaust valve is switched from the closed state to the open state, the accommodating space is communicated with the outside through the exhaust port, and when the internal pressure of the battery monomer is less than the preset threshold value, the exhaust valve is switched from the open state to the closed state. According to the battery monomer provided by the embodiment of the invention, in the use process, gas in the battery monomer can be exhausted, and the problem of overhigh air pressure in the battery monomer can be improved to a certain extent, so that the performance stability of the battery monomer is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, battery device, and power supply device. Background Technology

[0002] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are being used more and more in the field of energy storage.

[0003] In the manufacturing process of battery cells for battery devices, after placing the bare cell into a casing and closing the end cap, a casing-equipped battery cell is obtained. In related technologies, during normal use, the bare cell lacks a corresponding venting structure when it generates gas during cyclic expansion and charging / discharging. This gas remains inside the battery cell for extended periods, potentially leading to excessive internal pressure and affecting the battery cell's performance. Summary of the Invention

[0004] In view of this, this application aims to provide a battery cell, a battery device, and an electrical device that can discharge the gas inside the battery cell during use, thereby improving the problem of excessive gas pressure inside the battery cell to a certain extent and thus enhancing the performance stability of the battery cell.

[0005] To achieve the above objectives, embodiments of this application provide a single battery cell, comprising: The housing includes an end cap and a shell, the shell having a receiving space and an opening communicating with the receiving space, and the end cap covering the opening; An electrode assembly disposed within the receiving space; An exhaust valve is provided on the outer casing. The exhaust valve has an exhaust port and includes an open state and a closed state. When the internal pressure of the battery cell is greater than or equal to a predetermined threshold, the exhaust valve switches from the closed state to the open state. The accommodating space is connected to the outside through the exhaust port. When the internal pressure of the battery cell is less than the predetermined threshold, the exhaust valve switches from the open state to the closed state.

[0006] The battery cell provided in this application embodiment features a vent valve with a vent port on its outer casing. During use, when excessive gas accumulates inside the battery cell, causing the internal pressure to exceed or equal a predetermined threshold, the vent valve switches from a closed to an open state. The containment space connects to the outside through the vent port, allowing the accumulated gas to be released. Conversely, as the gas is released and the internal pressure falls below the predetermined threshold, the vent valve switches from an open to a closed state. This ensures a sealed environment within the battery cell after venting. Furthermore, it reduces the risk of casing deformation and cracking due to excessive gas pressure, and also minimizes the risk of connection failure between the casing and the end cap. The battery cell provided in this application embodiment, by releasing internal gas during use, mitigates the problem of excessive internal gas pressure, thereby improving the battery cell's performance stability.

[0007] In one embodiment, the exhaust valve includes a sealing medium, which is semi-solid. The sealing medium is disposed at the exhaust port and can seal the exhaust port. When the internal pressure of the battery cell is greater than or equal to a predetermined threshold, the gas inside the battery cell breaks through the sealing medium and is discharged through the exhaust port. In the closed state, the sealing medium flows back and seals the exhaust port.

[0008] By placing a sealing medium at the exhaust port, the exhaust port can be sealed.

[0009] In one embodiment, the sealing medium includes at least one of grease, petroleum jelly, and silicone oil.

[0010] In one embodiment, the end cap includes a body and a deformable region. The end cap includes a first state and a second state. In the first state, the deformable region is recessed relative to the body toward the receiving space. In the second state, the deformable region protrudes outward relative to the body. The exhaust valve is disposed in the deformable region.

[0011] When a battery cell accumulates too much gas inside, the deformed area can be pushed out to reduce the internal pressure of the battery cell. When the gas accumulated inside the battery cell continues to increase and reaches a predetermined threshold, the exhaust valve switches from the closed state to the open state, and then the gas is released through the exhaust valve.

[0012] In one embodiment, the wall thickness of at least a portion of the deformable region is less than the wall thickness of the body.

[0013] This facilitates the transition of the deformed area from the first state to the second state, allowing the deformed area to be easily pushed out when the battery cell has accumulated too much gas inside.

[0014] In one embodiment, the exhaust valve includes a deformable element, which includes a deformable portion and an exhaust port. When the internal pressure of the battery cell is greater than or equal to a predetermined threshold, the deformable portion undergoes elastic deformation under the action of the internal pressure of the battery cell and opens the exhaust port. When the internal pressure of the battery cell is less than the predetermined threshold, the deformable portion recovers its elastic deformation and closes the exhaust port.

[0015] In other words, the deformable part of the exhaust valve is provided with a deformable section, which opens and closes the exhaust port by undergoing elastic deformation and restoring elastic deformation.

[0016] In one embodiment, the exhaust valve further includes a seal, which is arranged along the thickness direction of the end cap and located on the side of the deformable member closer to the receiving space. In the closed state, the seal seals the exhaust port.

[0017] The seal and the deformable part are arranged along the thickness direction of the end cap. By placing the seal on the side of the deformable part close to the receiving space, it is easy for the seal to seal the exhaust port. When the deformable part undergoes elastic deformation under the internal pressure of the battery cell, the seal will not hinder the deformation of the deformable part.

[0018] In one embodiment, the sealing element includes a sealing portion and a vent. In the closed state, the sealing portion seals the vent, and the gas inside the battery cell can act on the deformable portion through the vent to cause the deformable portion to undergo elastic deformation. The vent is connected to the vent.

[0019] In other words, in the closed state, the sealing element and the deformation element cooperate to seal the vent of the deformation element. The gas inside the battery cell can act on the deformation element through the vent, causing the deformation element to undergo elastic deformation and open outward. A channel is formed between the deformation element and the sealing element, and the vent and the vent are connected. The gas inside the battery cell can be discharged sequentially through the vent and the vent.

[0020] In one embodiment, on a projection plane perpendicular to the thickness direction of the end cap, the projection of the vent overlaps with the projection of the deformed portion.

[0021] In other words, the vent is positioned to correspond to the deformation part, so that the gas inside the battery cell can directly act on the deformation part, causing the deformation part to undergo elastic deformation.

[0022] In one embodiment, the outer contour of the sealing portion is adapted to the outer contour of the exhaust port.

[0023] In this way, the exhaust port can be sealed well in the closed state, and after the deformation part undergoes elastic deformation, a larger gap can be created between the deformation part and the sealing part to improve exhaust efficiency.

[0024] In one embodiment, the exhaust valve further includes a sealing medium disposed at the exhaust port. When the internal pressure of the battery cell is greater than or equal to a predetermined threshold, the gas inside the battery cell breaks through the sealing medium and is discharged through the exhaust port. In the closed state, the sealing medium flows back and, together with the sealing part, seals the exhaust port.

[0025] In an embodiment where the deformable part and the seal are integrally molded, in order to separate the sealing part and the deformable part, that is, to allow the deformable part to move relative to the sealing part, a gap inevitably exists between the sealing part and the deformable part. In this case, a sealing medium can be filled into the vent, and the sealing medium can seal the gap between the sealing part and the deformable part.

[0026] In one embodiment, the exhaust port is constructed as a cut slit formed by cutting the deformable member, and the cut slit is in a sealed state under natural conditions.

[0027] In other words, by cutting an exhaust port on the deformable part, since the cut gap is sealed in its natural state, the deformable part does not deform when the internal pressure of the battery cell is less than a predetermined threshold. At this time, the exhaust valve is closed. When the internal pressure of the battery cell is greater than or equal to the predetermined threshold, the gas can open the cut gap and be discharged from the exhaust port.

[0028] In one embodiment, a portion of the deformable member forms the exhaust port through a recess.

[0029] A portion of the deformable part is recessed to form a hollow area, which serves as the vent.

[0030] In one embodiment, the exhaust port includes a plurality of exhaust holes.

[0031] In other words, pressure is released through multiple vents.

[0032] In one embodiment, the exhaust holes are formed in the exhaust valve in a uniformly distributed manner.

[0033] By forming the exhaust holes in an evenly distributed manner on the exhaust valve, it is beneficial to improve the stability of pressure release, avoid local blockage, and improve exhaust efficiency.

[0034] In one embodiment, the sidewall of the exhaust port includes a first curved surface segment and a second curved surface segment disposed opposite to each other. The first curved surface segment has a first arc as its cross-section in a cross-section parallel to the thickness direction of the end cap, and the second curved surface segment has a second arc as its cross-section in a cross-section parallel to the thickness direction of the end cap. The curvature centers of the first arc and the second arc are located outside the exhaust port.

[0035] Since the curvature centers of the first and second circular arcs are located outside the exhaust port, that is, the deformable part protrudes towards the center of the exhaust port, which is conducive to the deformation of the deformable part.

[0036] In one embodiment, the exhaust valve includes a sealing channel and a floating ball. The end of the sealing channel near the receiving space is the sealing end, and the end away from the receiving space is the exhaust port. The floating ball is disposed in the sealing channel. In the closed state, the floating ball is sealed to the side wall of the sealing channel. When the internal pressure of the battery cell is greater than or equal to a predetermined threshold, the floating ball floats under the action of the internal pressure of the battery cell, and the gas is discharged between the floating ball and the side wall of the sealing channel.

[0037] In other words, the exhaust valve has a floating ball embedded in it. When the internal pressure of the battery cell is less than a predetermined threshold, the floating ball seals with the side wall of the sealing channel. When the internal pressure of the battery cell is greater than or equal to the predetermined threshold, the floating ball floats under the action of the internal pressure of the battery cell, and a gap is formed between the floating ball and the sealing channel. Gas is discharged through the gap between the floating ball and the side wall of the sealing channel. This structure is simple and reliable.

[0038] A second aspect of this application provides a battery device including the battery cell described above.

[0039] A third aspect of this application provides an electrical device including the battery device described above, the battery device being used to provide electrical energy to the electrical device. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the structure of a single battery cell according to the first embodiment of this application; Figure 2 This is an exploded view of a single battery cell according to the second embodiment of this application; Figure 3 This is a partial structural diagram of the end cap according to the first embodiment of this application, wherein the exhaust valve is in the closed state; Figure 4 for Figure 3 A partial structural schematic diagram of the end cap from another perspective; Figure 5 for Figure 3 A cross-sectional view along the AA direction; Figure 6 for Figure 3 The diagram shows a cross-sectional view of the end cap located at the exhaust valve; Figure 7 for Figure 6 Enlarged view of point B in the middle; Figure 8 This is a partial structural diagram of the end cap according to the first embodiment of this application, wherein the exhaust valve is in the open state; Figure 9 for Figure 8 A cross-sectional view along the CC direction; Figure 10 This is a partial structural diagram of the end cap according to the second embodiment of this application; Figure 11 This is a partial structural diagram of the end cap according to the third embodiment of this application; Figure 12 This is a partial structural diagram of the end cap according to the fourth embodiment of this application; Figure 13 This is a schematic diagram of the vehicle structure according to some embodiments of this application; Figure 14 This is an exploded view of a battery device according to some embodiments of this application.

[0041] Explanation of reference numerals in the attached figures 10. Battery cell; 11. Casing; 12. End cap; 121. Body; 122. Deformation area; 123. Groove; 13. Exhaust valve; 131. Deformable part; 1311. Deformation section; 1312. Exhaust port; 1313. First curved surface section; 1314. Second curved surface section; 1315. Third curved surface section; 1316. Fourth curved surface section; 132. Seal; 1321. Seal part; 1322. Vent; 133. Sealing medium; 134. Floating ball; 135. Exhaust hole; 14. Electrode assembly; 15. Housing; 16. Pressure relief mechanism; 20. Battery box; 21. First box; 22. Second box; 100. Battery device; 200. Controller; 300. Motor; 1000. Vehicle. Detailed Implementation

[0042] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this application; the terms “comprising” and “having”, and any variations thereof, in the specification and the foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0044] In the description of the embodiments of this application, technical terms such as "first," "second," "third," and "fourth" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0045] In this document, the term "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. Unless otherwise specified, all embodiments and optional embodiments of this application may be combined with each other to form new technical solutions. The appearance of this phrase 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 will understand, explicitly and implicitly, that the embodiments described herein can be combined with other embodiments. Unless otherwise specified, all technical features and optional technical features of this application may be combined with each other to form new technical solutions.

[0046] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects are in an "or" relationship.

[0047] In the description of the embodiments of this application, the technical terms "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed, operated or used in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0048] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0049] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "contact" should be interpreted broadly, and can be direct contact, contact through an intermediate medium layer, contact between two contacting parties with substantially no interaction force, or contact between two contacting parties with interaction force.

[0050] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the technical term "projection" refers to an orthographic projection in which parallel projection lines are perpendicular to the projection plane.

[0051] The following is a detailed description of this application.

[0052] With the promotion and popularization of the concept of green development, new energy batteries are being used more and more widely in life and industry. For example, new energy vehicles equipped with batteries have been widely used. In addition, battery devices are being used more and more in the field of energy storage.

[0053] During normal use of the battery device, the internal materials of the battery cell generate gas during cyclic expansion and charging / discharging without a corresponding venting structure. This gas remains inside the battery cell for extended periods, potentially leading to excessive internal pressure and affecting battery cell performance. Furthermore, excessive pressure may cause the casing to deform outwards, even cracking and failing, or cause fatigue cracking at the connection between the casing and end caps, potentially leading to failure of the connection structure between the casing and end caps.

[0054] In view of this, in order to improve the problem of excessive internal pressure in a battery cell and enhance its performance stability, this application provides a battery cell including a casing, an electrode assembly, and an exhaust valve. The casing includes an end cap and a housing, the housing having a receiving space and an opening communicating with the receiving space, and the end cap covering the opening. The electrode assembly is disposed within the receiving space. The exhaust valve is disposed in the housing and has an exhaust port. The exhaust valve has an open state and a closed state. When the internal pressure of the battery cell is greater than or equal to a predetermined threshold, the exhaust valve switches from the closed state to the open state, and the receiving space communicates with the outside through the exhaust port. When the internal pressure of the battery cell is less than the predetermined threshold, the exhaust valve switches from the open state to the closed state.

[0055] The battery cell provided in this application embodiment features a vent valve with a vent port on its outer casing. During use, when excessive gas accumulates inside the battery cell, causing the internal pressure to exceed or equal a predetermined threshold, the vent valve switches from a closed to an open state. The containment space connects to the outside through the vent port, allowing the accumulated gas to be released. Conversely, as the gas is released and the internal pressure falls below the predetermined threshold, the vent valve switches from an open to a closed state. This ensures a sealed environment within the battery cell after venting. Furthermore, it reduces the risk of casing deformation and cracking due to excessive gas pressure, and also minimizes the risk of connection failure between the casing and the end cap. The battery cell provided in this application embodiment, by releasing internal gas during use, mitigates the problem of excessive internal gas pressure, thereby improving the battery cell's performance stability.

[0056] This application also provides a battery device, which includes a battery cell from any embodiment of this application.

[0057] The battery device provided in this application embodiment can be used, but is not limited to, in electrical devices such as vehicles, ships, or aircraft.

[0058] This application also provides an energy storage device, which includes the battery device in any embodiment of this application.

[0059] Energy storage devices can include energy storage containers, energy storage cabinets, etc.

[0060] This application also provides an electrical device including the above-described battery device. The electrical device can be, but is not limited to, a mobile phone, tablet, laptop, electric toy, power tool, electric vehicle, electric car, ship, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0061] In the following embodiments, for ease of explanation, an example of an electrical device according to an embodiment of this application is a vehicle.

[0062] Please see Figure 13The vehicle 1000 may contain a controller 200, a motor 300, and a battery device 100. The controller 200 controls the battery device 100 to supply power to the motor 300. For example, the battery device 100 may be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, it can serve as the operating power source for the vehicle 1000's electrical system, such as for the power requirements of starting, navigation, and operation. In another embodiment of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000 but also as the driving power source, replacing or partially replacing fuel or natural gas to provide driving power to the vehicle 1000.

[0063] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0064] Figure 14 This is an exploded view of a battery device according to some embodiments of this application; the battery device 100 mentioned in the embodiments of this application may include multiple battery cells 10 for providing voltage and capacity. The multiple battery cells 10 are connected in series, parallel, or mixed via a busbar.

[0065] In some embodiments, the battery apparatus 100 may include one or more battery cell assemblies. A battery cell assembly may include multiple battery cells 10, which are connected in series, parallel, or mixed connections via a busbar.

[0066] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells 10; as an example, one or more battery cell assemblies can constitute a battery module, which is formed by arranging and fixing multiple battery cell assemblies into a single module. As an example, a battery module can be formed by bundling multiple battery cell assemblies together with cable ties.

[0067] In some embodiments, the battery device 100 may be a battery pack, which includes a battery case 20 and one or more individual battery cells housed in the battery case 20.

[0068] As an example, one or more battery cell components can constitute a battery module, and the battery cell components can be housed in the battery case 20 by fixing the battery module in the battery case 20.

[0069] As an example, the battery cell assembly can also be housed in the battery box 20 by directly fixing multiple battery cells 10 to the battery box 20.

[0070] As an example, the battery box 20 may include a first box 21 and a second box 22. The first box 21 and the second box 22 are fastened together to form a closed space inside the battery box 20 to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first box 21 may be a top cover or a bottom plate.

[0071] As an example, the battery box 20 may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that the interior of the box forms an enclosed space to accommodate individual battery cells.

[0072] In some embodiments, the battery box 20 may be part of the chassis structure of the vehicle 1000. For example, a portion of the battery box 20 may be at least a portion of the floor of the vehicle 1000, or a portion of the battery box 20 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0073] Please see Figures 1 to 12 This application provides a battery cell 10, which includes a housing 11, an electrode assembly 14, and an exhaust valve 13. The housing 11 includes an end cap 12 and a casing 15. The casing 15 has a receiving space and an opening communicating with the receiving space, and the end cap 12 covers the opening. The electrode assembly 14 is disposed within the receiving space. The exhaust valve 13 is disposed on the housing 11 and has an exhaust port 1312. The exhaust valve 13 has an open state and a closed state. When the internal pressure of the battery cell 10 is greater than or equal to a predetermined threshold, the exhaust valve 13 switches from the closed state to the open state, and the receiving space communicates with the outside through the exhaust port 1312. When the internal pressure of the battery cell 10 is less than the predetermined threshold, the exhaust valve 13 switches from the open state to the closed state.

[0074] In this embodiment of the application, the battery cell 10 can be a secondary battery, which refers to the battery cell 10 that can be used again after being discharged by recharging to activate the active material.

[0075] The battery cell 10 can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0076] A battery cell 10 typically includes an electrode assembly 14. The electrode assembly 14 includes a positive electrode, a negative electrode, and a separator. During the charging and / or discharging process of the battery cell 10, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is disposed between the positive and negative electrodes to prevent short circuits between them while allowing active ions to pass through.

[0077] In some embodiments, the electrode assembly 14 further includes an isolator disposed between the positive and negative electrodes.

[0078] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0079] In some embodiments, the battery cell 10 further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application embodiment does not specifically limit the type of electrolyte and can select one according to requirements. The electrolyte can be liquid, gel, or solid.

[0080] In some embodiments, the electrode assembly 14 is a wound structure. The positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0081] In some embodiments, the electrode assembly 14 has a stacked structure.

[0082] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0083] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0084] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0085] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0086] As an example, the separator can be continuously arranged between any adjacent positive or negative electrode plates by folding or rolling.

[0087] In some embodiments, the electrode assembly 14 may be cylindrical, flat, or polygonal, etc.

[0088] In some embodiments, the electrode assembly 14 is provided with tabs (not shown) that allow current to be drawn from the electrode assembly 14. The tabs include a positive tab and a negative tab.

[0089] In some embodiments, please refer to Figures 1 to 2 The battery cell 10 may include a housing 11. The housing 11 is used to encapsulate the electrode assembly 14 and electrolyte components. The housing 11 may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing 15), or an aluminum-plastic film, etc.

[0090] As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell 10 of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic battery cells. Multi-prismatic battery cells are, for example, hexagonal prismatic battery cells. There are no particular limitations in the embodiments of this application.

[0091] In some embodiments, please refer to Figures 1 to 2 The outer casing 11 is provided with a pressure relief mechanism 16. The pressure relief mechanism 16 is used to release the internal pressure of the battery cell 10.

[0092] In other embodiments, the pressure relief mechanism 16 may also be referred to as an explosion-proof valve.

[0093] As an example, the internal pressure or temperature of the battery cell 10 is actuated to release the internal pressure or temperature when it reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 10 reaches the predetermined threshold, the pressure relief mechanism 16 is activated or a weak structure provided in the pressure relief mechanism 16 is destroyed, thereby forming an opening or channel for the release of internal pressure or temperature. The threshold design varies depending on design requirements. The threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 10.

[0094] As an example, the pressure relief mechanism 16 can be integrally formed with the housing 11.

[0095] As an example, the pressure relief mechanism 16 can also be separately configured and connected to the housing 11.

[0096] The term "actuation" as used in this application refers to the pressure relief mechanism 16 being activated or undergoing a certain state, thereby releasing the internal pressure and temperature of the battery cell 10. The actions of the pressure relief mechanism 16 may include, but are not limited to: movement of components within the pressure relief mechanism 16 to form an exhaust channel, rupture, breakage, tearing, or opening of at least a portion of the pressure relief mechanism 16, etc. When the pressure relief mechanism 16 is actuated, the high-temperature, high-pressure substances inside the battery cell 10 are discharged outwards from the actuated portion as waste. This method enables the battery cell 10 to release pressure and temperature under controllable pressure or temperature conditions, thereby preventing potentially more serious accidents.

[0097] The emissions from the battery cell 10 mentioned in this application include, but are not limited to: electrolyte, dissolved or split positive and negative electrode plates, fragments of separators, high-temperature and high-pressure gases generated by the reaction, flames, etc.

[0098] It should be noted that the exhaust valve 13 in this application differs from the pressure relief mechanism 16. The pressure relief mechanism 16 typically discharges the high-temperature, high-pressure substances inside the battery cell 10 as waste material from the actuated part during thermal runaway. This method allows for pressure and temperature relief of the battery cell 10 under controllable pressure or temperature, thereby preventing potentially more serious accidents. In contrast, the exhaust valve 13 switches from a closed state to an open state when the internal pressure of the battery cell 10 is greater than or equal to a predetermined threshold. This allows the gas accumulated inside the battery cell 10 to be discharged. As the gas is discharged, when the internal pressure of the battery cell 10 falls below the predetermined threshold, the exhaust valve 13 switches from an open state to a closed state, allowing the battery cell 10 to continue to be used.

[0099] In some embodiments, the housing 11 is provided with electrode terminals, which pass through the housing 11 and are electrically connected to the electrode assembly 14 via tabs.

[0100] In some specific embodiments, the electrode terminals are made of conductive metal, such as copper or aluminum.

[0101] The "multiple" mentioned in the embodiments of this application refers to two or more.

[0102] As an example, the exhaust valve 13 can be integrally formed with the housing 11.

[0103] As an example, the exhaust valve 13 can also be separately installed and connected to the housing 11.

[0104] As an example, the exhaust valve 13 may also be partially integrally formed with the housing 11, and the other part may be separately set and connected to the housing 11.

[0105] In some embodiments, the housing 11 includes an end cap 12 and a housing 15, the housing 15 having an opening, and the end cap 12 covering the opening. The housing 15 may have one or more openings. The end cap 12 may also be provided one or more times.

[0106] There can be one or more exhaust valves 13.

[0107] As an example, the exhaust valve 13 may be located on the end cap 12.

[0108] As an example, the exhaust valve 13 may be located in the housing 15.

[0109] As an example, the exhaust valve 13 may be located on the end cap 12 and the housing 15.

[0110] As an example, the predetermined threshold may depend on the materials of one or more of the positive electrode, negative electrode, electrolyte, and separator in the battery cell 10.

[0111] In embodiments including the pressure relief mechanism 16, the threshold for activating the exhaust valve 13 is less than the threshold for activating the pressure relief mechanism 16. That is, the predetermined threshold is less than the threshold for activating the pressure relief mechanism 16.

[0112] The exhaust valve 13 is provided with an exhaust port 1312. The exhaust valve 13 includes an open state and a closed state. Please refer to [link / reference]. Figures 8 to 9 When open, the exhaust port 1312 is open, and the receiving space communicates with the outside through the exhaust port 1312. Please refer to [link / reference]. Figures 3 to 5 When closed, the exhaust port 1312 is closed, and the accommodating space is not connected to the outside.

[0113] Thus, when venting is required, the vent valve 13 opens to release the gas accumulated inside the battery cell 10. After venting is completed, the vent valve 13 closes, without affecting the continued use of the battery cell 10.

[0114] The battery cell 10 provided in this embodiment features an exhaust valve 13 on the outer casing 11, with an exhaust port 1312. During use, when excessive gas accumulates inside the battery cell, causing its internal pressure to exceed or equal a predetermined threshold, the exhaust valve 13 switches from closed to open, allowing the containment space to connect to the outside through the exhaust port 1312. This releases the accumulated gas. Conversely, when the internal pressure falls below the predetermined threshold, the exhaust valve 13 switches from open to closed, maintaining a sealed interior after venting. Furthermore, this reduces the risk of deformation and cracking of the outer casing 11 due to excessive gas pressure, and also minimizes the risk of connection failure between the casing 15 and the end cap 12. The battery cell 10 provided in this embodiment, by releasing internal gas during use, alleviates the problem of excessive internal gas pressure and improves the performance stability of the battery cell 10.

[0115] It should be noted that the exhaust valve 13 has various structural forms.

[0116] In some embodiments, please refer to Figures 3 to 5The exhaust valve 13 includes a sealing medium 133, which is semi-solid. The sealing medium 133 is disposed at the exhaust port 1312 and can seal the exhaust port 1312. When the internal pressure of the battery cell 10 is greater than or equal to a predetermined threshold, the gas inside the battery cell 10 breaks through the sealing medium 133 and is discharged through the exhaust port 1312. In the closed state, the sealing medium 133 flows back and seals the exhaust port 1312.

[0117] For example, the sealing medium 133 is sealing grease.

[0118] Sealing grease is typically semi-solid and belongs to a thickened grease system. It combines shape retention and thixotropic flow characteristics, making it a functional lubricant specifically designed for sealing gaps and preventing media leakage or the intrusion of external impurities.

[0119] The sealing medium 133 has a large tension. During normal use, the sealing medium 133 plays the role of sealing the exhaust port 1312 and can prevent overflow to other areas to a certain extent.

[0120] By providing a sealing medium 133 at the exhaust port 1312, the sealing medium 133 can seal the exhaust port 1312. When the internal pressure of the battery cell 10 is greater than or equal to a predetermined threshold due to excessive gas accumulation inside, the gas inside the battery cell 10 breaks through the sealing medium 133 and is discharged through the exhaust port 1312. After the venting is completed, the sealing medium 133 flows back to the exhaust port 1312 and reseals the exhaust port 1312.

[0121] As an example, the sealing medium 133 includes at least one of grease, petroleum jelly, and silicone oil.

[0122] In other words, the sealing medium 133 may include one of the following: grease, petroleum jelly, and silicone oil, or any two or three of the following: grease, petroleum jelly, and silicone oil.

[0123] As an example, silicone oil can withstand temperatures above 200°C, making it suitable for the high-temperature environment during the charge and discharge process of a single battery cell. It possesses good chemical inertness, low volatility, and electrical insulation. It does not readily react with other substances, preventing corrosion or decomposition. Under long-term sealed conditions, it does not easily evaporate, reducing internal pressure fluctuations. As a non-conductor, it can isolate the internal conductive paths of the battery.

[0124] As an example, silicone oil with a viscosity greater than or equal to 500,000 cSt is used.

[0125] As an example, the sealing medium 133 can also be a liquid adhesive.

[0126] The sealing medium 133 can also be a semi-solid sealing medium 133 such as lubricating grease or petroleum jelly. The semi-solid sealing medium 133 is a substance between solid and liquid. Its core characteristic is that it is in a plastic state at room temperature and can flow when subjected to shear.

[0127] In some embodiments, please refer to Figures 1 to 5 The end cap 12 includes a body 121 and a deformable region 122. The end cap 12 includes a first state and a second state. In the first state, the deformable region 122 is recessed relative to the body 121 toward the receiving space. In the second state, the deformable region 122 protrudes outward relative to the body 121. An exhaust valve 13 is disposed in the deformable region 122.

[0128] In the initial state, the deformation area 122 is concave inward, and the end cap 12 is in the first state. When the battery cell 10 has too much gas inside, the deformation area 122 can be pushed out and become a convex bulge. That is, the end cap 12 switches from the first state to the second state. The internal volume of the battery cell 10 increases, and it can accommodate a certain amount of gas. To a certain extent, this can improve the problem of excessive gas pressure inside the battery cell 10, thereby reducing the deformation and cracking of the outer shell 11 caused by excessive gas pressure. It can also reduce the problem of failure of the connection structure between the shell 15 and the end cap 12.

[0129] Here, when the battery cell 10 has too much gas inside, the deformation area 122 can be pushed out to reduce the internal pressure of the battery cell 10. When the gas inside the battery cell 10 continues to increase and reaches a predetermined threshold, the exhaust valve 13 switches from the closed state to the open state, and then exhaust is performed through the exhaust valve 13.

[0130] In some embodiments, please refer to Figures 1 to 5 The wall thickness of at least a portion of the deformed region 122 is less than the wall thickness of the body 121.

[0131] Here, the deformation region 122 can be a region where the wall thickness is less than that of the body 121, or it can be a localized thinning, for example, only the edge of the deformation region 122 is thinned.

[0132] For example, the deformable region 122 may be formed by stamping the end cap 12, and the metal stretching caused during the stamping process thins the edge of the deformable region 122. There may be one or more deformable regions 122.

[0133] As an example, each deformed region 122 corresponds to an exhaust valve 13.

[0134] As an example, the deformable region 122 can be integrally formed with the body 121.

[0135] As an example, the deformable region 122 can also be separately set up and connected to the main body 121.

[0136] The deformable area 122 and the main body 121 can be made of the same material, such as aluminum, or they can be different, using an aluminum-stainless steel composite structure, with the deformable area 122 made of stainless steel and the main body 121 made of aluminum.

[0137] As an example, the deformed region 122 can be formed by processes such as drawing and upsetting.

[0138] It should be noted that the exhaust valve 13 has various structural forms.

[0139] In some embodiments, please refer to Figures 3 to 5 The exhaust valve 13 includes a deformation element 131, which includes a deformation portion 1311 and an exhaust port 1312. When the internal pressure of the battery cell 10 is greater than or equal to a predetermined threshold, the deformation portion 1311 undergoes elastic deformation under the action of the internal pressure of the battery cell 10 and opens the exhaust port 1312. When the internal pressure of the battery cell 10 is less than the predetermined threshold, the deformation portion 1311 recovers its elastic deformation and closes the exhaust port 1312.

[0140] In other words, the deformable part 131 of the exhaust valve 13 is provided with a deformable part 1311, which opens and closes the exhaust port 1312 by undergoing elastic deformation and restoring elastic deformation.

[0141] The structure of the deformation part 1311 can be determined according to the size of the predetermined threshold. For example, the force required for the deformation part 1311 to undergo elastic deformation can be determined. The structure is simple, reliable, and easy to set.

[0142] As an example, the deformable portion 1311 at least defines a portion of the sidewall of the vent 1312; in other words, the deformable portion 1311 is formed at the same time as the vent 1312 is formed.

[0143] Thus, when the deformable part 1311 undergoes elastic deformation, it can change the shape and size of the exhaust port 1312, thereby enabling the accommodating space to communicate with the outside through the exhaust port 1312.

[0144] Understandably, under the internal pressure of the battery cell 10, the end of the deformable part 1311 near the exhaust port 1312 is more likely to open outward.

[0145] There may be one or more deformable parts 1311. As an example, there are two deformable parts 1311, which are arranged opposite to each other.

[0146] There can be one or more exhaust ports 1312.

[0147] The end cap 12 can be made of a material with high ductility so that when the battery cell 10 has too much gas inside, the deformed area 122 can be pushed out smoothly, and the deformed part 1311 can undergo elastic deformation smoothly under the internal pressure of the battery cell 10 and open the exhaust port 1312.

[0148] In one specific embodiment, please refer to Figure 3 There is one exhaust port 1312 and two deformation parts 1311. The two deformation parts 1311 are arranged on opposite sides of the exhaust port 1312 and each defines part of the sidewall of the exhaust port 1312. When the gas inside the battery cell 10 acts on the deformation parts 1311, the two deformation parts 1311 undergo elastic deformation and open outward, the exhaust port 1312 becomes larger and communicates with the accommodating space.

[0149] In one specific embodiment, please refer to Figure 10 There are two exhaust ports 1312 and two deformation parts 1311. The two deformation parts 1311 correspond to the two exhaust ports 1312 respectively. That is, each deformation part 1311 defines a part of the sidewall of each exhaust port 1312. When the gas inside the battery cell 10 acts on the deformation part 1311, the two deformation parts 1311 undergo elastic deformation and open outward. The exhaust port 1312 becomes larger and communicates with the accommodating space.

[0150] As an example, the deformable portion 1311 protrudes toward the center of the deformable member 131, or in other words, the deformable portion 1311 protrudes toward the exhaust port 1312. This facilitates the deformation of the deformable portion 1311.

[0151] In some embodiments, please refer to Figures 3 to 5 The exhaust valve 13 also includes a seal 132, which is arranged along the thickness direction of the end cap 12 and is located on the side of the deformable element 131 close to the receiving space. In the closed state, the seal 132 seals the exhaust port 1312.

[0152] As an example, the seal 132 can be integrally formed with the deformable part 131.

[0153] As an example, the seal 132 can also be separately configured and connected to the deformable element 131.

[0154] The sealing element 132 and the deformation element 131 are arranged along the thickness direction of the end cap 12. By placing the sealing element 132 on the side of the deformation element 131 close to the receiving space, the sealing element 132 can seal the exhaust port 1312. When the deformation part 1311 undergoes elastic deformation under the internal pressure of the battery cell 10, the sealing element 132 will not hinder the deformation of the deformation part 1311.

[0155] In the embodiment where the exhaust valve 13 and the end cap 12 are integrally formed, the sealing element 132 and the deformation element 131 are arranged along the thickness direction of the end cap 12. That is, the sum of the thicknesses of the sealing element 132 and the deformation element 131 is less than or equal to the thickness of the end cap 12, which is beneficial to improving the elasticity of the deformation part 1311.

[0156] As an example, the sum of the thicknesses of the seal 132 and the deformable element 131 is equal to the wall thickness of the deformable region 122.

[0157] It should be noted that there are multiple ways in which the seal 132 seals the exhaust port 1312.

[0158] In some embodiments, please refer to Figures 3 to 5 The sealing element 132 includes a sealing part 1321 and a vent 1322. In the closed state, the sealing part 1321 seals the exhaust port 1312. The gas inside the battery cell 10 can act on the deformation part 1311 through the vent 1322 to cause the deformation part 1311 to undergo elastic deformation. The vent 1322 is connected to the exhaust port 1312.

[0159] In other words, in the closed state, the seal 132 cooperates with the deformable part 131 so that the sealing part 1321 of the seal 132 seals the exhaust port 1312 of the deformable part 131. The gas inside the battery cell 10 can act on the deformable part 1311 through the vent 1322, so that the deformable part 1311 undergoes elastic deformation and opens outward. A channel is formed between the deformable part 1311 and the sealing part 1321. The vent 1322 is connected to the exhaust port 1312, and the gas inside the battery cell 10 can be discharged sequentially through the vent 1322 and the exhaust port 1312.

[0160] As an example, the sealing portion 1321 at least defines a portion of the sidewall of the vent 1322; in other words, the sealing portion 1321 is formed at the same time as the vent 1322 is formed.

[0161] In some embodiments, please refer to Figures 6 to 9 On the projection plane perpendicular to the thickness direction of the end cap 12, there is an overlapping area between the projection of the vent 1322 and the projection of the deformed part 1311.

[0162] In other words, the vent 1322 is provided corresponding to the deformation part 1311, so that the gas inside the battery cell 10 can directly act on the deformation part 1311, causing the deformation part 1311 to undergo elastic deformation.

[0163] As an example, on a projection plane perpendicular to the thickness direction of the end cap 12, the projection of the deformable part 1311 is located within the projection range of the vent 1322.

[0164] As an example, on a projection plane perpendicular to the thickness direction of the end cap 12, the projection range of the vent 1322 is greater than the projection range of the deformable part 1311.

[0165] This helps improve exhaust efficiency.

[0166] As an example, on a projection plane perpendicular to the thickness direction of the end cap 12, the projection range of the vent 1322 is greater than the projection range of the exhaust port 1312.

[0167] This helps improve exhaust efficiency.

[0168] As an example, the vent 1322 and the exhaust port 1312 are offset. The sealing part 1321 and the deformation part 1311 are also offset.

[0169] To improve the manufacturing convenience of the end cap 12, the projection range of the vent 1322 on the projection plane perpendicular to the thickness direction of the end cap 12 is larger than the projection range of the deformable part 1311. In this way, the deformable part 131 and the sealing part 132 can be integrally molded so that the sealing part 1321 and the deformable part 1311 can be separated. However, a gap is unavoidable between the sealing part 1321 and the deformable part 1311. At this time, the gap between the sealing part 1321 and the deformable part 1311 can be sealed by filling the vent 1312 with a sealing medium 133.

[0170] In some embodiments, please refer to Figures 6 to 7 The outer contour of the sealing part 1321 is adapted to the outer contour of the exhaust port 1312.

[0171] In other words, the outer contour of the sealing part 1321 is roughly the same as that of the exhaust port 1312, and the dimensions can be the same or have some differences.

[0172] In this way, the exhaust port 1312 can be sealed well in the closed state, and after the deformation part 1311 undergoes elastic deformation, a larger gap can be generated between the deformation part 1311 and the sealing part 1321 to improve exhaust efficiency.

[0173] In some embodiments, please refer to Figures 3 to 5 The exhaust valve 13 also includes a sealing medium 133, which is disposed at the exhaust port 1312. When the internal pressure of the battery cell 10 is greater than or equal to a predetermined threshold, the gas inside the battery cell 10 breaks through the sealing medium 133 and is discharged through the exhaust port 1312. In the closed state, the sealing medium 133 flows back and seals the exhaust port 1312 together with the sealing part 1321.

[0174] In the embodiment where the deformable part 131 and the seal 132 are integrally formed, in order to separate the seal 1321 and the deformable part 1311, that is, to allow the deformable part 1311 to move relative to the seal 1321, an unavoidable gap exists between the seal 1321 and the deformable part 1311. In this case, the gap between the seal 1321 and the deformable part 1311 can be sealed by filling the vent 1312 with a sealing medium 133.

[0175] In other words, by setting a sealing medium 133, the sealing medium 133 and the sealing part 1321 jointly seal the exhaust port 1312, which is beneficial to further improve the sealing performance.

[0176] It should be noted that there are various specific structural forms of the exhaust port 1312.

[0177] In some embodiments, please refer to Figure 10 The exhaust port 1312 is constructed by a cutting slit formed by the deformable part 131 through cutting, and the cutting slit is in a sealed state under natural conditions.

[0178] In other words, by cutting an exhaust port 1312 on the deformable part 131, since the cut gap is sealed in its natural state, the deformable part 131 does not deform when the internal pressure of the battery cell 10 is less than a predetermined threshold. At this time, the exhaust valve 13 is in a closed state. When the internal pressure of the battery cell 10 is greater than or equal to the predetermined threshold, the gas can open the cut gap and be discharged from the exhaust port 1312.

[0179] Of course, in some embodiments, a sealing medium 133 can be provided at the cut gap to seal the cut gap, further improving the sealing performance. In other embodiments, a sealing element 132 can be provided to seal the exhaust port 1312.

[0180] In some embodiments, please refer to Figures 3 to 5 A portion of the deformable part 131 forms an exhaust port 1312 through a recess.

[0181] In other words, a portion of the deformable part 131 is recessed to form a hollow area, which is the exhaust port 1312.

[0182] In some embodiments, please refer to Figures 3 to 7The sidewall of the exhaust port 1312 includes a first curved surface segment 1313 and a second curved surface segment 1314 arranged opposite to each other. The first curved surface segment 1313 has a first arc in the cross section parallel to the thickness direction of the end cap 12, and the second curved surface segment 1314 has a second arc in the cross section parallel to the thickness direction of the end cap 12. The curvature centers of the first and second arcs are located outside the exhaust port 1312.

[0183] As an example, the first curved surface segment 1313 also forms the sidewall of the deformed part 1311, and the second curved surface segment 1314 also forms the sidewall of another deformed part 1311. That is, the exhaust port 1312 shares part of the sidewall with the deformed part 1311.

[0184] Since the curvature centers of the first and second arcs are located outside the exhaust port 1312, that is, the deformable part 1311 protrudes toward the center of the exhaust port 1312, which is conducive to the deformation of the deformable part 1311.

[0185] As an example, the first surface segment 1313 and the second surface segment 1314 are mirrored.

[0186] As an example, the sidewall of the exhaust port 1312 also includes a third curved surface segment 1315 and a fourth curved surface segment 1316 arranged opposite to each other. The first curved surface segment 1313, the third curved surface segment 1315, the second curved surface segment 1314 and the fourth curved surface segment 1316 are connected in sequence to enclose and form the exhaust port 1312. The cross-section of the third curved surface segment 1315 in a cross-section parallel to the thickness direction of the end cap 12 is a third arc. The cross-section of the fourth curved surface segment 1316 in a cross-section parallel to the thickness direction of the end cap 12 is a fourth arc. The curvature centers of the third arc and the fourth arc are located inside the exhaust port 1312.

[0187] As an example, the third surface segment 1315 and the fourth surface segment 1316 are mirrored.

[0188] The first curved surface segment 1313, the third curved surface segment 1315, the second curved surface segment 1314 and the fourth curved surface segment 1316 are connected in sequence to enclose and form an exhaust port 1312 that is roughly axe-shaped.

[0189] As an example, the vent 1322 is provided corresponding to the deformable part 1311, and the projection of the vent 1322 on the projection plane perpendicular to the thickness direction of the end cap 12 is approximately elliptical.

[0190] In some embodiments, please refer to Figure 11 The exhaust port 1312 includes multiple exhaust holes 135.

[0191] In other words, pressure is released through multiple vents 135.

[0192] As an example, the diameter of the vent hole 135 ranges from 0.1 mm to 1 mm. In this way, while allowing air to be released through the vent hole 135, it is also beneficial to seal the vent hole 135.

[0193] As an example, sealing performance can be further improved by providing a sealing medium 133 at the vent 135, which can seal the vent 135. Furthermore, since the vent 135 has a diameter ranging from 0.1 mm to 1 mm, the entry of the sealing medium 133 into the receiving space through the vent 135 can also be improved.

[0194] As an example, the housing 11 is also provided in the groove 123, and the vent hole 135 is formed in the groove wall of the groove 123. This facilitates the placement of the sealing medium 133 in the groove 123, improves the situation where the sealing medium 133 overflows, and also facilitates the return of the sealing medium 133 after venting, further improving the reliability of the vent valve 13.

[0195] As an example, groove 123 is formed in deformed region 122.

[0196] The total area of ​​all vent holes 135 determines the pressure relief capacity; the larger the total area of ​​all vent holes 135, the faster the pressure relief speed.

[0197] It should be noted that the arrangement of the exhaust port 135 is not restricted here.

[0198] In some embodiments, please refer to Figure 11 Each exhaust port 135 is formed in a uniformly distributed manner on the exhaust valve 13.

[0199] It should be noted that the exhaust holes 135 are "uniformly distributed," meaning that the exhaust holes 135 are arranged in a matrix or concentric circles. In other words, the arrangement of each exhaust hole 135 is uniform. However, it is understandable that the exhaust holes 135 may not be uniformly distributed within the cross-section of the exhaust valve 13. That is, while the exhaust holes 135 are uniformly distributed, they do not uniformly divide the entire exhaust valve 13. For example, if the cross-section of the exhaust valve 13 is circular, the matrix-distributed exhaust holes 135 are not uniformly distributed within the circular cross-section.

[0200] As an example, each exhaust port 135 is distributed as multiple groups of air ports, which are evenly distributed on the circumference of the exhaust valve 13. Each group of air ports includes multiple exhaust ports 135 arranged radially along the exhaust valve 13.

[0201] As an example, the vent 135 can be arranged in shapes such as circles, hexagons, and squares.

[0202] By forming the exhaust ports 135 in a uniformly distributed manner on the exhaust valve 13, it is beneficial to improve the stability of pressure release, avoid local blockage, and improve exhaust efficiency.

[0203] In some embodiments, please refer to Figure 12 The exhaust valve 13 includes a sealing channel and a floating ball 134. The end of the sealing channel near the receiving space is the sealing end, and the end away from the receiving space is the exhaust port 1312. The floating ball 134 is disposed in the sealing channel. In the closed state, the floating ball 134 is sealed with the side wall of the sealing channel. When the internal pressure of the battery cell 10 is greater than or equal to a predetermined threshold, the floating ball 134 floats under the action of the internal pressure of the battery cell 10, and the gas is discharged between the floating ball 134 and the side wall of the sealing channel.

[0204] In other words, the exhaust valve 13 has a built-in floating ball 134. When the internal pressure of the battery cell 10 is less than a predetermined threshold, the floating ball 134 is sealed to the side wall of the sealing channel. When the internal pressure of the battery cell 10 is greater than or equal to the predetermined threshold, the floating ball 134 floats under the action of the internal pressure of the battery cell 10, and a gap is formed between the floating ball 134 and the sealing channel. Gas is discharged through the gap between the floating ball 134 and the side wall of the sealing channel. This structure is simple and reliable.

[0205] In the description of this application, the references to terms such as "in one embodiment," "in some embodiments," "in other embodiments," "in yet another embodiment," or "exemplary," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the embodiments of this application. In this application, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine the different embodiments or examples described in this application, as well as the features of the different embodiments or examples.

[0206] The above description is merely a preferred embodiment of this application and is not intended to limit the application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application are included within the scope of protection of this application.

Claims

1. A battery cell, characterized by, The application relates to a battery cell, which comprises: a housing, the housing comprising an end cover and a shell, the shell being provided with a containing space and an opening communicating with the containing space, the end cover covering the opening; an electrode assembly arranged in the containing space; an exhaust valve arranged on the housing, the exhaust valve being provided with an exhaust port, the exhaust valve comprising an open state and a closed state, when the internal pressure of the battery cell is greater than or equal to a predetermined threshold value, the exhaust valve is switched from the closed state to the open state, the containing space is in communication with the outside through the exhaust port, when the internal pressure of the battery cell is less than the predetermined threshold value, the exhaust valve is switched from the open state to the closed state.

2. The battery cell of claim 1, wherein, The exhaust valve comprises a sealing medium, the sealing medium being semi-solid, the sealing medium being arranged in the exhaust port and capable of sealing the exhaust port, when the internal pressure of the battery cell is greater than or equal to the predetermined threshold value, the gas in the battery cell breaks through the sealing medium and is discharged through the exhaust port, in the closed state, the sealing medium flows back and seals the exhaust port.

3. The battery cell of claim 2, wherein, The sealing medium comprises at least one of lubricating grease, vaseline and silicon oil.

4. The battery cell of claim 1, wherein, The end cover comprises a body and a deformation area, the end cover comprising a first state and a second state, in the first state, the deformation area is recessed towards the containing space relative to the body, in the second state, the deformation area is outwardly convex relative to the body, the exhaust valve is arranged in the deformation area.

5. The battery cell of claim 4, wherein, The wall thickness of at least a part of the deformation area is less than the wall thickness of the body.

6. The battery cell of claim 1, wherein, The exhaust valve comprises a deformation member, the deformation member comprising a deformation part and the exhaust port, when the internal pressure of the battery cell is greater than or equal to the predetermined threshold value, the deformation part is elastically deformed under the action of the internal pressure of the battery cell and opens the exhaust port, when the internal pressure of the battery cell is less than the predetermined threshold value, the deformation part restores the elastic deformation and closes the exhaust port.

7. The battery cell of claim 6, wherein, The exhaust valve further comprises a sealing member, the sealing member being arranged along the thickness direction of the end cover and located on the side of the deformation member close to the containing space, in the closed state, the sealing member seals the exhaust port.

8. The battery cell of claim 7, wherein, The sealing member comprises a sealing part and a vent port, in the closed state, the sealing part seals the exhaust port, the gas in the battery cell can act on the deformation part through the vent port to make the deformation part elastically deform, the vent port is in communication with the exhaust port.

9. The battery cell of claim 8, wherein, In a projection plane perpendicular to the thickness direction of the end cover, the projection of the vent port and the projection of the deformation part have an overlapping area.

10. The battery cell of claim 8, wherein, The outer contour of the sealing part is adapted to the outer contour of the exhaust port.

11. The battery cell of claim 8, wherein, The exhaust valve further comprises a sealing medium, the sealing medium being arranged in the exhaust port, when the internal pressure of the battery cell is greater than or equal to the predetermined threshold value, the gas in the battery cell breaks through the sealing medium and is discharged through the exhaust port, in the closed state, the sealing medium flows back and seals the exhaust port together with the sealing part.

12. The battery cell of any one of claims 6 to 11, wherein, The exhaust port is configured as a cutting gap formed by cutting of the shape-changing member, and the cutting gap is in a sealed state in a natural state.

13. The battery cell of any one of claims 6 to 11, wherein, A partial area of the shape-changing member is recessed to form the exhaust port.

14. The battery cell of any one of claims 1 to 11, wherein, The exhaust port includes a plurality of exhaust holes.

15. The battery cell of claim 14, wherein, Each of the exhaust holes is formed in a uniformly distributed manner in the exhaust valve.

16. The battery cell of any one of claims 1 to 11, wherein, A side wall of the exhaust port includes oppositely arranged first and second curved segments, a tangent line of the first curved segment in a cross section parallel to a thickness direction of the end cover is a first circular arc, a tangent line of the second curved segment in the cross section parallel to the thickness direction of the end cover is a second circular arc, and centers of curvatures of the first and second circular arcs are located outside the exhaust port.

17. The battery cell of any one of claims 1 to 5, wherein, The exhaust valve includes a sealing channel and a floating ball, one end of the sealing channel close to the containing space is a sealed end, and an end of the sealing channel away from the containing space is the exhaust port, the floating ball is arranged in the sealing channel, in the closed state, the floating ball is in sealing cooperation with a side wall of the sealing channel, when an internal pressure of the battery cell is greater than or equal to a predetermined threshold value, the floating ball floats under the action of the internal pressure of the battery cell, and gas is discharged between the floating ball and the side wall of the sealing channel.

18. A battery device characterized by comprising: The battery device includes at least one battery cell according to any one of claims 1-17.

19. An electrical device, comprising: The battery device according to claim 18 is used to provide electric energy for the electric device.

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