Battery device and electric device
A flexible exhaust structure with a pressure relief mechanism addresses space occupation and safety issues in battery cells by efficiently exhausting gas during thermal runaway, enhancing safety and utilization.
Patent Information
- Application Number
- CN202422409604.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2024-12-20
- Estimated Expiration
- 2034-09-30
AI Technical Summary
The existing exhaust structures for battery cells occupy a large space, affecting the utilization rate and increasing the risk of thermal interference and gas leakage, which compromises the safety and efficiency of battery devices.
A flexible exhaust structure with a pressure relief mechanism and an exhaust channel connected to a battery cell, which deforms to accommodate gas during thermal runaway, reducing space occupation and enhancing safety by sealing the connection to the pressure relief port.
Improves safety and space utilization by efficiently exhausting high-temperature and high-pressure gas, reducing thermal interference and gas leakage, and simplifying assembly.
Smart Images
Figure CN222214397U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of battery technology, and in particular to a battery device and an electrical device. Background Art
[0002] In recent years, power batteries have made great progress. Power batteries can be widely used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, as well as electric vehicles, power tools, military equipment, aerospace and other fields. As the main component of power batteries, the safety performance of battery cells directly affects the safety of power batteries. The electrode components in the battery cells will continuously generate heat during operation. When the heat inside the battery cells accumulates to a certain extent, thermal runaway will occur inside and a large amount of high-temperature and high-pressure gas will be generated, which may lead to risks such as explosion of the battery cells.
[0003] In order to reduce the risk of battery cell explosion, a pressure relief valve can be installed on the battery cell, and an exhaust structure with an exhaust channel can be installed on the outside of the battery cell. The high-temperature and high-pressure gas generated when the battery cell thermally runs away can be discharged through the pressure relief valve and the exhaust channel. However, due to the complex design of the current exhaust structure, it occupies a large space, which affects the utilization rate of the space around the battery cell. Utility Model Content
[0004] The embodiments of the present application provide a battery device and an electrical device, which can improve the space utilization of the battery device.
[0005] In the first aspect, an embodiment of the present application provides a battery device, comprising at least one battery cell and an exhaust structure, the battery cell comprising a first pressure relief mechanism, the first pressure relief mechanism comprising a pressure relief port; the exhaust structure is arranged on one side of the battery cell and connected to the battery cell, an exhaust channel is formed in the exhaust structure, the exhaust channel is connected to the first pressure relief mechanism of at least one battery cell, an air inlet is formed in the exhaust structure, the exhaust structure close to the air inlet is arranged around the circumference of the pressure relief port and is sealed with the first pressure relief mechanism, the air inlet is connected to the pressure relief port, and the exhaust structure is a flexible structure.
[0006] In the above scheme, the battery device includes at least one battery cell and an exhaust structure, the battery cell includes a first pressure relief mechanism, the first pressure relief mechanism includes a pressure relief port, the first pressure relief mechanism can adjust the internal and external pressure difference of the battery cell, when the battery cell has thermal runaway and generates high temperature and high pressure gas, the first pressure relief mechanism can discharge the gas, thereby helping to improve the safety of the battery cell. The exhaust structure is arranged on one side of the battery cell and connected to the battery cell, an exhaust channel is formed in the exhaust structure, the exhaust channel is connected to the first pressure relief mechanism of at least one battery cell, the exhaust structure is a flexible structure, when the first pressure relief mechanism exhausts outward, the exhaust structure can be deformed under the action of gas pressure to quickly swell in the direction away from the first pressure relief mechanism, the exhaust channel can accommodate gas and allow the gas to circulate, so as to improve the exhaust efficiency and ensure the pressure balance in the battery cell, when the first pressure relief mechanism does not exhaust, the exhaust structure shrinks to a flat shape in the direction close to the first pressure relief mechanism, thereby reducing the space occupied by the exhaust structure and improving the utilization rate of the internal space of the battery device. In addition, the exhaust structure near the air inlet is arranged around the circumference of the pressure relief port and is sealed and connected to the first pressure relief mechanism, thereby reducing the risk of leakage of the high-temperature and high-pressure gas and affecting other surrounding components. Moreover, the exhaust structure is sealed and connected to the first pressure relief mechanism so that the pressure relief port is connected to the air inlet. Compared with setting the exhaust structure to be sealed and connected to the outer shell so that the pressure relief port is connected to the air inlet, on the one hand, the thermal interference between the exhaust structure and the outer shell can be reduced, and the risk of heat of the gas in the exhaust channel being transferred from the exhaust structure to the outer shell, and then transferred to the internal electrode assembly through the outer shell is reduced, so as to further improve the safety performance of the battery cell. On the other hand, the sealed connection path between the exhaust structure and the battery cell can be shortened, the sealing failure points between the two can be reduced, and the risk of leakage of high-temperature and high-pressure gas affecting other surrounding structures can be reduced.
[0007] In some embodiments, at least a portion of the exhaust structure corresponding to the air inlet is arranged around the outer peripheral side of the first pressure relief mechanism, and the exhaust structure is sealedly connected to the outer peripheral side of the first pressure relief mechanism toward at least a portion of the inner wall of the air inlet; or, at least a portion of the exhaust structure corresponding to the air inlet is located inside the pressure relief port, and the exhaust structure is adhered to and sealedly connected to the inner wall of the pressure relief port away from at least a portion of the outer wall of the air inlet.
[0008] In the above scheme, at least part of the exhaust structure corresponding to the air inlet is arranged around the outer peripheral side of the first pressure relief mechanism, and at least part of the inner wall of the exhaust structure facing the air inlet is sealed and connected to the outer peripheral side of the first pressure relief mechanism, that is, the exhaust structure corresponding to the air inlet is sleeved on the outer peripheral side of the first pressure relief mechanism, thereby increasing the contact area between the exhaust structure and the first pressure relief mechanism, and improving the sealing connection effect between the exhaust structure and the first pressure relief mechanism. Alternatively, at least part of the exhaust structure corresponding to the air inlet is located in the pressure relief port, and at least part of the outer wall of the exhaust structure facing away from the air inlet is attached to and sealed with the inner wall of the pressure relief port, thereby increasing the contact area between the exhaust structure and the first pressure relief mechanism, and improving the sealing connection effect between the exhaust structure and the first pressure relief mechanism.
[0009] In some embodiments, the battery device further includes a sealant, and the exhaust structure is sealed and connected to the first pressure relief mechanism via the sealant.
[0010] In the above solution, the exhaust structure is sealed and connected to the first pressure relief mechanism by means of sealant, which can reduce the difficulty of assembling the exhaust structure and the first pressure relief mechanism, while ensuring the sealing effect between the exhaust structure and the first pressure relief mechanism.
[0011] In some embodiments, a slot is disposed around the outer circumference of the first pressure relief mechanism, at least a portion of the exhaust structure corresponding to the air inlet is disposed around the outer circumference of the first pressure relief mechanism, and a portion of the exhaust structure is disposed in the slot.
[0012] In the above scheme, a slot is provided on the outer peripheral side of the first pressure relief mechanism, and the slot is arranged around the circumference of the first pressure relief mechanism. When at least part of the exhaust structure corresponding to the air inlet is arranged around the outer peripheral side of the first pressure relief mechanism, the part of the exhaust structure can be inserted into the slot, so as to limit the exhaust structure through the slot, and realize the connection between the first pressure relief mechanism and the exhaust structure. At the same time, the part of the exhaust structure is inserted into the slot, which can also increase the contact area between the exhaust structure and the first pressure relief mechanism, and improve the sealing effect between the exhaust structure and the first pressure relief mechanism.
[0013] In some embodiments, there are multiple battery cells, and the exhaust passage is connected to the first pressure relief mechanisms of the multiple battery cells.
[0014] In the above scheme, the exhaust channel of the exhaust structure is simultaneously connected to the first pressure relief mechanisms of multiple battery cells. Compared with the one-to-one arrangement of multiple exhaust structures and multiple battery cells, it helps to simplify the overall structure of the exhaust structure and the battery cells, reduce their occupation of the internal space of the battery device, and reduce costs.
[0015] In some embodiments, there are multiple exhaust structures, and the exhaust passage of each exhaust structure is connected to the first pressure relief mechanisms of multiple battery cells.
[0016] In the above scheme, a plurality of exhaust structures are provided, and the exhaust passages of each exhaust structure are connected to the first pressure relief mechanisms of a plurality of battery cells. This can improve the overall exhaust efficiency of the battery device on the basis of simplifying the exhaust structure and the structure of the battery cells. When large-scale thermal runaway of battery cells occurs in the battery device, the high-temperature and high-pressure gases generated in the battery cells can be quickly exhausted through the exhaust passages of the plurality of exhaust structures, thereby improving the safety performance of the battery device.
[0017] In some embodiments, the battery cells connected to the exhaust channel of the same exhaust structure are distributed along a first direction to form a battery cell group, the exhaust structure extends along the first direction, the battery cell groups and the exhaust structures are distributed along a second direction, and the first direction and the second direction are arranged to intersect.
[0018] In the above scheme, the battery cells connected to the exhaust channel of the same exhaust structure are distributed along the first direction, so that the exhaust structure extends in a straight line along the first direction, which can shorten the length of the exhaust structure and reduce the space occupied by the exhaust structure. At the same time, compared with the exhaust structure extending in a curved manner, the exhaust channel of the exhaust structure extending in a straight line usually extends in a straight line, so it can also facilitate the flow of gas in the exhaust channel. The battery cell groups and the exhaust structures are distributed along the second direction, which can improve the neatness of the battery device and reduce the overall space occupied by the components in the battery device.
[0019] In some embodiments, the exhaust structures are separated from each other, and each exhaust structure is provided with an exhaust port, which is connected to the exhaust channel of the corresponding exhaust structure; or, the exhaust channels of the exhaust structures are connected to each other, and at least one of the exhaust structures is formed with an exhaust port, which is connected to the exhaust channel.
[0020] In the above scheme, the exhaust channels of the exhaust structures are interconnected, and at least one of the exhaust structures is formed with an exhaust port, so that the gas in the exhaust channel can be discharged through the exhaust port, avoiding the accumulation of high-temperature and high-pressure gas and affecting the safety of the battery device. Alternatively, the exhaust structures are separated from each other, and their exhaust channels are isolated from each other and not connected, so as to reduce the mutual interference between the battery cells, and avoid the high-temperature and high-pressure gas generated when some battery cells have thermal runaway to flow to other battery cells through the exhaust channel, thereby affecting the safety of other battery cells. In addition, each exhaust structure is provided with an exhaust port, so that the high-temperature and high-pressure gas in each exhaust channel can be discharged through the corresponding exhaust port, thereby accelerating the exhaust efficiency and improving the safety performance of the battery device.
[0021] In some embodiments, the battery device further includes a box body and a second pressure relief mechanism, the box body is formed with a accommodating cavity, the exhaust structure and each battery cell are accommodated in the accommodating cavity, the second pressure relief mechanism is arranged in the box body, and the exhaust port is connected to the second pressure relief mechanism.
[0022] In the above scheme, a second pressure relief mechanism is arranged on the box of the battery device, so that the second pressure relief mechanism is connected to the exhaust port of the exhaust structure. The second pressure relief mechanism can be opened in time when the pressure inside the exhaust channel is too high to quickly release the pressure and reduce the risk of explosion of the exhaust structure due to excessive air pressure.
[0023] In some embodiments, the exhaust structure is a high temperature resistant air bag.
[0024] In the above scheme, the exhaust structure is set as a high-temperature resistant air bag. On the one hand, the exhaust structure can be more easily bulged in the direction away from the first pressure relief mechanism under the action of air pressure, so that the exhaust channel can allow gas to flow. On the other hand, it can reduce the risk of the exhaust structure being melted by high-temperature and high-pressure gas, thereby increasing the service life of the exhaust structure.
[0025] In a second aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery device.
[0026] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0028] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;
[0029] Figure 2 An exploded view of a battery device according to some embodiments of the present application;
[0030] Figure 3 A schematic diagram of the structure of a battery cell in some embodiments of the present application;
[0031] Figure 4 An exploded view of a battery cell provided for some embodiments of the present application;
[0032] Figure 5 A cross-sectional schematic diagram of a battery device provided in some embodiments of the present application when the exhaust structure is in one state;
[0033] Figure 6A cross-sectional schematic diagram of a battery device provided in some embodiments of the present application when the exhaust structure is in another state;
[0034] Figure 7 A partial enlarged view of the exhaust structure of a battery device provided in some embodiments of the present application;
[0035] Figure 8 A partial enlarged view of the exhaust structure of a battery device provided in some other embodiments of the present application;
[0036] Fig. 9 A partial enlarged view of the exhaust structure of a battery device provided in some other embodiments of the present application;
[0037] Fig.10 is an axonometric diagram of a battery device provided in some embodiments of the present application;
[0038] Fig.11 A top view of a battery device provided for some embodiments of the present application;
[0039] Fig.12 Another isometric view of a battery device provided for some embodiments of the present application.
[0040] The figures are as follows:
[0041] Vehicle 1000; battery device 100; controller 200; motor 300; first part 10; battery cell 20; first pressure relief mechanism 21; pressure relief port 211; slot 212; electrode assembly 22; shell 23; end cover 24; accommodating space 25; battery cell group 26; second part 30; exhaust structure 40; exhaust channel 41; second pressure relief mechanism 50; first direction X; second direction Y. DETAILED DESCRIPTION
[0042] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0043] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as those commonly understood by technicians in the technical field to which this application belongs; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.
[0044] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.
[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.
[0046] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.
[0047] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.
[0048] The term “plurality” used in this application refers to two or more (including two).
[0049] In the present application, the term "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; meanwhile, "vertical" includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.
[0050] In the embodiment of the present application, the battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.
[0051] The battery cells can be 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-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc., which are not limited in the embodiments of the present application.
[0052] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode and a negative electrode. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are inserted and removed back and forth between the positive electrode and the negative electrode.
[0053] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.
[0054] In some embodiments, the battery cell may include a shell. The shell may be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film. In some embodiments, the shell may be a sealed structure or a non-sealed structure. As an example, when the shell is a non-sealed structure, the shell plays a role in protecting the electrode assembly, and a sealed bag is also included between the shell and the electrode assembly, and the sealed bag is used to encapsulate the electrode assembly and the electrolyte. Specifically, the sealed bag may be a bag-shaped insulating member or an aluminum-plastic film. When the shell is a sealed structure, it is used to encapsulate components such as the electrode assembly and the electrolyte.
[0055] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack 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 polygonal battery, such as a hexagonal battery.
[0056] In some embodiments, a pressure relief mechanism is provided on the housing, and the pressure relief mechanism is used to release the internal pressure of the battery cell.
[0057] As an example, when the internal pressure or temperature of the battery cell reaches a predetermined threshold, it is actuated to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell reaches a predetermined threshold, the pressure relief mechanism performs an action or a weak structure provided in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released. The threshold design varies according to different design requirements. The threshold may depend on one or more materials of the positive electrode plate, negative electrode plate, electrolyte and separator in the battery cell.
[0058] As an example, the pressure relief mechanism may be integrally formed with the housing. For example, notches may be made on the housing to form a weak structure, and the weak structure serves as the pressure relief mechanism.
[0059] The pressure relief mechanism can also be separately arranged and connected with the housing, for example, the pressure relief mechanism is welded to the housing or connected through other components. As an example, notches are arranged on the pressure relief mechanism to form a weak structure.
[0060] As an example, the pressure relief mechanism may take the form of an explosion-proof valve, a balancing valve, a gas valve, a pressure relief valve, or a safety valve.
[0061] In some embodiments, the housing includes an end cap and a shell, the shell is provided with an opening, and the end cap is provided to cover the opening. The shell may be provided with one or more openings. One or more end caps may also be provided.
[0062] In some embodiments, at least one electrode terminal is disposed on the housing, and the electrode terminal is electrically connected to the electrode tab. The electrode terminal may be directly connected to the electrode tab, or may be indirectly connected to the electrode tab through a current collecting member. The electrode terminal may be disposed on an end cap, or may be disposed on the housing.
[0063] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar.
[0064] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.
[0065] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by a cable tie.
[0066] In some embodiments, the battery device may be a battery pack, which includes a case and one or more battery cell assemblies, wherein the battery cell assemblies are accommodated in the case.
[0067] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.
[0068] As an example, the battery cell assembly may also be housed in the case by directly fixing a plurality of battery cells to the case.
[0069] As an example, the box body 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 a closed space is formed inside the box body to accommodate the battery cell assembly.
[0070] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.
[0071] The technical solutions described in the embodiments of the present application are applicable to various electrical devices that use battery cells, such as mobile phones, portable devices, laptop computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, for example, spacecraft include airplanes, rockets, space shuttles and spacecraft, etc.
[0072] With the development of new energy technology, batteries are used more and more widely, for example, in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes and electric tools, etc.
[0073] A battery cell is usually composed of a shell and an electrode assembly arranged in the shell. In addition, the battery cell also includes an electrolyte filled in the shell. The electrolyte soaks the electrode assembly. During the charge and discharge process of the battery device, the electrolyte can conduct ions between the positive electrode sheet and the negative electrode sheet of the electrode assembly.
[0074] During the operation of the battery cell, the electrode assembly will continuously generate heat. When the heat accumulates to a certain extent inside the battery cell, thermal runaway will occur inside the battery cell and a large amount of high-temperature and high-pressure gas will be generated, which may lead to risks such as explosion of the battery cell. In order to reduce the risk of battery cell explosion, a first pressure relief mechanism can be set on the battery cell, and an exhaust structure with an exhaust channel can be set on the outside of the battery cell, so that the high-temperature and high-pressure gas generated by thermal runaway of the battery cell can be discharged through the first pressure relief mechanism and the exhaust channel. However, when the current exhaust structure is set on the outside of the battery cell, it occupies a large space, which is easy to affect the utilization rate of the space around the battery cell, and then affect the space utilization rate of the battery module and the entire battery device.
[0075] Based on the above considerations, an embodiment of the present application provides a battery device, comprising at least one battery cell and an exhaust structure, the battery cell comprising a first pressure relief mechanism, the first pressure relief mechanism comprising a pressure relief port; an exhaust channel is formed in the exhaust structure, the exhaust channel is connected to the first pressure relief mechanism of at least one battery cell, the exhaust structure is formed with an air inlet, the exhaust structure close to the air inlet is arranged around the circumference of the pressure relief port and is sealed with the first pressure relief mechanism, the air inlet is connected to the pressure relief port, and the exhaust structure is a flexible structure.
[0076] In the above technical solution, the battery device includes at least one battery cell and an exhaust structure. The battery cell includes a first pressure relief mechanism. The first pressure relief mechanism can adjust the internal and external pressure difference of the battery cell. When the battery cell has thermal runaway and generates high-temperature and high-pressure gas, the first pressure relief mechanism can discharge the gas, which is beneficial to improve the safety of the battery cell. An exhaust channel is formed in the exhaust structure, and the exhaust channel is connected to the first pressure relief mechanism of at least one battery cell. The exhaust structure is a flexible structure. When the first pressure relief mechanism exhausts gas outward, the exhaust structure can be deformed under the action of gas pressure to bulge in the direction away from the first pressure relief mechanism. The exhaust channel can accommodate gas and allow the gas to circulate, so as to improve the exhaust efficiency and ensure the pressure balance in the battery cell. When the first pressure relief mechanism does not exhaust gas, the exhaust structure shrinks to a flat shape in the direction close to the first pressure relief mechanism, so as to reduce the space occupied by the exhaust structure and improve the utilization rate of the space in the battery device. In addition, the exhaust structure near the air inlet is arranged around the circumference of the pressure relief port and is sealed and connected to the first pressure relief mechanism, thereby reducing the risk of leakage of the high-temperature and high-pressure gas and affecting other surrounding components. Moreover, the exhaust structure is sealed and connected to the first pressure relief mechanism so that the pressure relief port is connected to the air inlet. Compared with setting the exhaust structure to be sealed and connected to the outer shell so that the pressure relief port is connected to the air inlet, on the one hand, the thermal interference between the exhaust structure and the outer shell can be reduced, and the risk of heat of the gas in the exhaust channel being transferred from the exhaust structure to the outer shell, and then transferred to the internal electrode assembly through the outer shell is reduced, so as to further improve the safety performance of the battery cell. On the other hand, the sealed connection path between the exhaust structure and the battery cell can be shortened, the sealing failure points between the two can be reduced, and the risk of leakage of high-temperature and high-pressure gas affecting other surrounding structures can be reduced.
[0077] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.
[0078] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000, for example, the battery device 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.
[0079] In some embodiments of the present application, the battery device 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.
[0080] Please refer to Figure 2 , Figure 2 An exploded view of a battery device provided for some embodiments of the present application. The battery device 100 includes a box body and a battery cell 20. In some embodiments, the box body may include a first portion 10 and a second portion 30, the first portion 10 and the second portion 30 cover each other, and the first portion 10 and the second portion 30 jointly define a housing cavity for accommodating the battery cell 20. The second portion 30 may be a hollow structure with one end open, the first portion 10 may be a plate-like structure, the first portion 10 covers the open side of the second portion 30, so that the first portion 10 and the second portion 30 jointly define a housing cavity; the first portion 10 and the second portion 30 may also be hollow structures with one side open, and the open side of the first portion 10 covers the open side of the second portion 30. Of course, the box body formed by the first portion 10 and the second portion 30 may be in a variety of shapes, such as a cylinder, a cuboid, etc.
[0081] Figure 3 for Figure 2 The schematic diagram of the structure of the battery cell shown. In the battery device 100, there can be multiple battery cells 20, and the multiple battery cells 20 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the box; of course, the battery device 100 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and are accommodated in the box. The battery device 100 can also include other structures. For example, the battery device 100 can also include a busbar component for realizing electrical connection between the multiple battery cells 20.
[0082] Each battery cell 20 may be a secondary battery cell or a primary battery cell, or a lithium-sulfur battery cell, a sodium-ion battery cell, or a magnesium-ion battery cell, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular, or in other shapes.
[0083] Figure 4 An exploded view of a battery cell provided in some embodiments of the present application, Figure 5 A cross-sectional schematic diagram of a battery device provided in some embodiments of the present application when the exhaust structure is in a certain state, Figure 6A schematic cross-sectional view of a battery device provided in some embodiments of the present application when the exhaust structure is in another state.
[0084] See also Figure 4-Figure 6 In the first aspect, the embodiment of the present application provides a battery device 100, including at least one battery cell 20 and an exhaust structure 40, the battery cell 20 including a first pressure relief mechanism 21, the first pressure relief mechanism 21 including a pressure relief port 211; the exhaust structure 40 is arranged on one side of the battery cell 20 and connected to the battery cell 20, an exhaust channel 41 is formed in the exhaust structure 40, the exhaust channel 41 is communicated with the first pressure relief mechanism 21 of at least one battery cell 20, an air inlet is formed in the exhaust structure 40, the exhaust structure 40 close to the air inlet is arranged around the circumference of the pressure relief port 211, and is sealed with the first pressure relief mechanism 21, the air inlet is communicated with the pressure relief port 211, and the exhaust structure 40 is a flexible structure.
[0085] Specifically, the battery cell 20 may include an outer shell, an electrode assembly 22 and a first pressure relief mechanism 21. The outer shell includes a shell body 23 and an end cover 24. The shell body 23 and the end cover 24 may enclose a receiving space 25. The electrode assembly 22 is arranged in the receiving space 25. The first pressure relief mechanism 21 is arranged on the outer shell. Its pressure relief port 211 is respectively connected to the air inlet of the exhaust structure 40 and the receiving space 25 of the battery cell 20. When thermal runaway occurs inside the battery cell 20 and high-temperature and high-pressure gas is generated, the pressure relief port 211 can be quickly opened, so that the high-temperature and high-pressure gas in the receiving space 25 can quickly pass through the pressure relief port 211 and the air inlet and enter the exhaust channel 41, thereby reducing the risk of explosion of the battery cell 20.
[0086] The exhaust structure 40 is disposed on one side of the battery cell 20 and connected to the battery cell 20. An exhaust channel 41 is formed inside the exhaust structure 40, and the exhaust channel 41 is connected to the first pressure relief mechanism 21. Therefore, the high-temperature and high-pressure gas exhausted through the first pressure relief mechanism 21 can enter the exhaust channel 41 of the exhaust structure 40 to ensure the pressure balance of the internal accommodation space 25 of the battery cell 20. The exhaust structure 40 can be connected to the first pressure relief mechanism 21 of one battery cell 20, and can also be connected to the first pressure relief mechanisms 21 of multiple battery cells 20 at the same time. The exhaust structure 40 is a flexible structure, which may include a first state and a second state. The first state may be the state in which the exhaust structure 40 is located when thermal runaway occurs inside the battery cell 20 and high-temperature and high-pressure gas is generated, and the high-temperature and high-pressure gas enters the exhaust channel 41 through the first pressure relief mechanism 21. The second state may be the state in which the exhaust structure 40 is located when high-temperature and high-pressure gas is not generated inside the battery cell 20. For example, the second state may be the state in which the exhaust structure 40 is located when the battery cell 20 is working normally and thermal runaway does not occur, or the state in which the exhaust structure 40 is located when thermal runaway occurs in the battery cell 20 and the high-temperature and high-pressure gas generated is completely discharged. In the first state, the high-temperature and high-pressure gas generated by thermal runaway inside the battery cell 20 enters the exhaust channel 41 through the first pressure relief mechanism 21. The exhaust structure 40 may bulge in a direction away from the first pressure relief mechanism 21 under the action of the pressure of the high-temperature and high-pressure gas, and the volume of the exhaust channel 41 increases, which may allow gas to circulate. In the second state, no high-temperature and high-pressure gas is generated in the battery cell 20, and the exhaust structure 40 is not impacted by gas pressure. It can shrink to a flat shape toward the first pressure relief mechanism 21, and the exhaust channel 41 in the exhaust structure 40 is approximately in the shape of a gap.
[0087] The air inlet of the exhaust structure 40 can be in the shape of an opening or in the shape of an annular channel. When the air inlet is in the shape of an opening, the air inlet can be a through hole opened on the wall of the exhaust structure 40, and the inner wall of the exhaust structure 40 facing the air inlet can be arranged around the outer peripheral side of the first pressure relief mechanism 21. When the air inlet is in the shape of an annular channel, the air inlet can be formed by enclosing part of the exhaust structure 40, that is, at this time, the exhaust structure 40 can include a first part and a third part, the first part encloses to form the exhaust channel 41, and the third part encloses to form the air inlet. The exhaust structure 40 close to the air inlet, that is, the third part of the exhaust structure 40, is arranged around the circumference of the pressure relief port 211 and is sealed and connected to the first pressure relief mechanism 21, which can avoid the leakage of high-temperature and high-pressure gas generated by thermal runaway inside the battery cell 20. It should be noted that the sealed connection in the embodiment of the present application can be a viscose connection, or it can be any method that can achieve a sealed connection between the exhaust structure 40 and the first pressure relief mechanism 21, such as crimping, magnetic connection, etc. When the air inlet is in the shape of an annular channel and the exhaust structure 40 close to the air inlet is arranged around the circumference of the pressure relief port 211, the partial exhaust structure 40 can be circumferentially arranged on the outer peripheral side of the first pressure relief mechanism 21, or it can also be located inside the pressure relief port 211 and circumferentially adhere to the inner wall of the pressure relief port 211 along the circumference of the pressure relief port 211, or the partial exhaust structure 40 can also be sealed and connected to the first pressure relief mechanism 21 at the end face of the first pressure relief mechanism 21 away from the outer shell of the battery cell 20.
[0088] In the above scheme, the battery device 100 includes at least one battery cell 20 and an exhaust structure 40. The battery cell 20 includes a first pressure relief mechanism 21. The first pressure relief mechanism 21 can adjust the internal and external pressure difference of the battery cell 20. When the battery cell 20 undergoes thermal runaway and generates high-temperature and high-pressure gas, the first pressure relief mechanism 21 can discharge the gas, thereby helping to improve the safety of the battery cell 20. The exhaust structure 40 is arranged on one side of the battery cell 20 and is connected to the battery cell 20. An exhaust channel 41 is formed in the exhaust structure 40. The exhaust channel 41 is connected to the first pressure relief mechanism 21 of at least one battery cell 20. The exhaust structure 40 is a flexible structure. When the first pressure relief mechanism 21 exhausts air outward, the exhaust structure 40 is in a first state. The exhaust structure 40 can be deformed under the action of gas pressure to bulge in a direction away from the first pressure relief mechanism 21. The exhaust channel 41 can accommodate gas and allow the gas to circulate to improve the exhaust efficiency and ensure the pressure balance in the battery cell 20. When the first pressure relief mechanism 21 does not exhaust air, the exhaust structure 40 is in a second state. The exhaust structure 40 shrinks to a flat shape in a direction close to the first pressure relief mechanism 21, thereby reducing the space occupied by the exhaust structure 40 and improving the utilization rate of the internal space of the battery device 100. In addition, the exhaust structure 40 near the air inlet is arranged along the circumference of the pressure relief port 211 and is sealed and connected to the first pressure relief mechanism 21, thereby reducing the risk of leakage of the high-temperature and high-pressure gas and affecting other surrounding components. Moreover, the exhaust structure 40 is sealed and connected to the first pressure relief mechanism 21 so that the pressure relief port 211 is connected to the air inlet. Compared with setting the exhaust structure 40 to be sealed and connected to the outer shell, on the one hand, it can reduce the thermal interference between the exhaust structure 40 and the outer shell, and reduce the risk of heat of the gas in the exhaust channel 41 being transferred from the exhaust structure 40 to the outer shell, and then transferred to the internal electrode assembly 22 through the outer shell, thereby improving the safety performance of the battery cell 20. On the other hand, it can also shorten the sealed connection path between the exhaust structure 40 and the battery cell 20, reduce the sealing failure points between the two, and reduce the risk of leakage of high-temperature and high-pressure gas affecting other surrounding structures.
[0089] In addition, in the embodiment of the present application, since the exhaust structure 40 shrinks to a flat shape in the direction close to the first pressure relief mechanism 21 in the second state, when installing the exhaust structure 40, there is no need to consider the compatibility between the first part 10 of the battery device 100 and the exhaust structure 40, which can reduce the difficulty of assembling the battery device 100 and improve its assembly efficiency.
[0090] Optionally, the exhaust structure 40 may be a structure made of flexible materials such as an air bag or an airbag. When not subjected to air pressure shock, the exhaust structure 40 may shrink to a flat shape in a direction close to the first pressure relief mechanism 21. When gas enters the exhaust channel 41 from the first pressure relief mechanism 21, the exhaust structure 40 may swell in a direction away from the first pressure relief mechanism 21 under the action of air pressure, thereby increasing the volume of the exhaust channel 41. Of course, the exhaust structure 40 may also be other structures, so that it can swell after being subjected to air pressure shock and shrink when not subjected to air pressure shock.
[0091] In some embodiments, the exhaust structure 40 is formed with an exhaust port, which is communicated with the exhaust channel 41 .
[0092] The exhaust port can be connected to the external environment, so that the gas in the exhaust channel 41 can flow to the external environment through the exhaust port. It can be understood that the exhaust port can be in the shape of an opening, which can be a through hole opened on the wall of the exhaust structure 40, or the exhaust port can also be in the shape of an annular channel formed by a part of the exhaust structure 40. When the exhaust port is in the shape of an annular channel, the exhaust port can be formed by a part of the exhaust structure 40, that is, the exhaust structure 40 can include a first part and a second part, the first part encloses the exhaust channel 41, and the second part encloses the exhaust port. Optionally, one exhaust port can be formed on the same exhaust structure 40, or multiple exhaust ports can be formed.
[0093] In the above scheme, the exhaust structure 40 is formed with an exhaust port, which is connected to the exhaust channel 41 to exhaust gas in a directional manner through the exhaust structure 40, so that the gas in the exhaust channel 41 can be discharged through the exhaust port, avoiding the accumulation of high-temperature and high-pressure gas and affecting the safety of the battery device 100.
[0094] Figure 7 This is a partial enlarged view of the exhaust structure of the battery device provided in some embodiments of the present application. Figure 8 A partial enlarged view of the exhaust structure of a battery device provided in some other embodiments of the present application.
[0095] See also Figure 7 and Figure 8 In some embodiments, at least a portion of the exhaust structure 40 corresponding to the air inlet is arranged around the outer peripheral side of the first pressure relief mechanism 21, and at least a portion of the inner wall of the exhaust structure 40 facing the air inlet is sealedly connected to the outer peripheral side of the first pressure relief mechanism 21; or, at least a portion of the exhaust structure 40 corresponding to the air inlet is located in the pressure relief port 211, and at least a portion of the outer wall of the exhaust structure 40 facing away from the air inlet is adhered to and sealedly connected to the inner wall of the pressure relief port 211.
[0096] When at least part of the exhaust structure 40 corresponding to the air inlet is disposed around the outer peripheral side of the first pressure relief mechanism 21, the air inlet is in the shape of an annular channel, and the inner wall of the exhaust structure 40 facing the air inlet is attached to and sealed with the outer peripheral side surface of the first pressure relief mechanism 21, which is equivalent to at least part of the first pressure relief mechanism 21 being located in the air inlet. Alternatively, at least part of the exhaust structure 40 corresponding to the air inlet is located in the pressure relief port 211, in which case the air inlet is in the shape of an annular channel, and the outer wall of the exhaust structure 40 away from the air inlet can be attached to and sealed with the inner wall of the pressure relief port 211 along the circumference of the pressure relief port 211. It can be understood that there are various ways of sealing and connecting the exhaust structure 40 and the first pressure relief mechanism 21. For example, the exhaust structure 40 and the first pressure relief mechanism 21 can be fixed by bonding with adhesive, or, when the exhaust structure 40 corresponding to the air inlet is arranged around the outer peripheral side of the first pressure relief mechanism 21, a pressure ring can be sleeved on the outer peripheral side of the exhaust structure 40 corresponding to the air inlet, and the exhaust structure 40 is pressed against the outer peripheral side surface of the first pressure relief mechanism 21 by the pressure ring; when the exhaust structure 40 corresponding to the air inlet is located in the pressure relief port 211, the outer wall of the exhaust structure 40 facing away from the air inlet is in contact with the inner wall of the pressure relief port 211, a pressure ring can be arranged around the inner wall of the exhaust structure 40 facing the air inlet, and the exhaust structure 40 is pressed against the inner wall of the pressure relief port 211 by the pressure ring.
[0097] In the above scheme, at least part of the exhaust structure 40 corresponding to the air inlet is arranged around the outer peripheral side of the first pressure relief mechanism 21, and at least part of the inner wall of the exhaust structure 40 facing the air inlet is sealed and connected to the outer peripheral side of the first pressure relief mechanism 21, that is, the exhaust structure 40 corresponding to the air inlet is sleeved on the outer peripheral side of the first pressure relief mechanism 21, so that the contact area between the exhaust structure 40 and the first pressure relief mechanism 21 can be increased, and the sealing connection effect between the exhaust structure 40 and the first pressure relief mechanism 21 can be improved. Alternatively, at least part of the exhaust structure 40 corresponding to the air inlet is located in the pressure relief port 211, and at least part of the outer wall of the exhaust structure 40 facing away from the air inlet is attached to and sealed with the inner wall of the pressure relief port 211, so that the contact area between the exhaust structure 40 and the first pressure relief mechanism 21 can be increased, and the sealing connection effect between the exhaust structure 40 and the first pressure relief mechanism 21 can be improved.
[0098] In some embodiments, the battery device 100 further includes a sealant, and the exhaust structure 40 is sealed and connected to the first pressure relief mechanism 21 via the sealant.
[0099] When at least part of the exhaust structure 40 corresponding to the air inlet is arranged around the outer peripheral side of the first pressure relief mechanism 21, a sealant may be provided between the inner wall of the exhaust structure 40 facing the air inlet and the outer peripheral side surface of the first pressure relief mechanism 21, so as to achieve a sealed connection between the exhaust structure 40 and the first pressure relief mechanism 21 through the sealant. When at least part of the exhaust structure 40 corresponding to the air inlet is located in the pressure relief port 211, a sealant may be provided between the outer wall of the exhaust structure 40 facing away from the air inlet and the inner wall of the pressure relief port 211, so as to achieve a sealed connection between the exhaust structure 40 and the first pressure relief mechanism 21 through the sealant. Alternatively, when the exhaust structure 40 corresponding to the air inlet is sealedly connected to the first pressure relief mechanism 21 at the end face of the first pressure relief mechanism 21 away from the outer shell of the battery cell 20, a sealant may be provided between the end face of the exhaust structure 40 corresponding to the air inlet and the end face of the first pressure relief mechanism 21, so as to achieve a sealed connection between the two end faces through the sealant. It is understandable that when the exhaust structure 40 is sealed and connected to the first pressure relief mechanism 21 through the sealant, the sealant is arranged around the circumference of the pressure relief port 211 to ensure the sealing effect.
[0100] In the above solution, the exhaust structure 40 is sealed and connected to the first pressure relief mechanism 21 by sealant, which can reduce the difficulty of assembling the exhaust structure 40 and the first pressure relief mechanism 21 while ensuring the sealing effect between the exhaust structure 40 and the first pressure relief mechanism 21.
[0101] Fig. 9 A partial enlarged view of the exhaust structure of a battery device provided in some other embodiments of the present application.
[0102] like Fig. 9 As shown, in some embodiments, a slot 212 is arranged around the outer peripheral side of the first pressure relief mechanism 21 , and at least a portion of the exhaust structure 40 corresponding to the air inlet is arranged around the outer peripheral side of the first pressure relief mechanism 21 , and a portion of the exhaust structure 40 is clamped in the slot 212 .
[0103] The card slot 212 is formed on the outer peripheral side of the first pressure relief mechanism 21 , and can be formed by the outer peripheral side surface of the first pressure relief mechanism 21 , or it can also be formed by the outer peripheral side surface of the first pressure relief mechanism 21 and the outer surface of the battery cell 20 shell.
[0104] In the above scheme, a clamping groove 212 is provided on the outer peripheral side of the first pressure relief mechanism 21, and the clamping groove 212 is arranged around the circumference of the first pressure relief mechanism 21. When at least part of the exhaust structure 40 corresponding to the air inlet is arranged around the outer peripheral side of the first pressure relief mechanism 21, the part of the exhaust structure 40 can be clamped into the clamping groove 212, so as to limit the exhaust structure 40 through the clamping groove 212, so as to realize the connection between the first pressure relief mechanism 21 and the exhaust structure 40. At the same time, the clamping of part of the exhaust structure 40 into the clamping groove 212 can also increase the contact area between the exhaust structure 40 and the first pressure relief mechanism 21, and improve the sealing effect between the exhaust structure 40 and the first pressure relief mechanism 21.
[0105] Fig.10 is an axonometric diagram of a battery device provided in some embodiments of the present application.
[0106] See also Fig.10 In some embodiments, there are multiple battery cells 20 , and the exhaust passage 41 is connected to the first pressure relief mechanisms 21 of the multiple battery cells 20 .
[0107] The battery device 100 may include a plurality of battery cells 20, and the actual number of battery cells 20 may be reasonably set in actual applications. The exhaust channel 41 of the exhaust structure 40 may be connected to the first pressure relief mechanism 21 of at least some of the battery cells 20, or may be connected to the first pressure relief mechanism 21 of all the battery cells 20.
[0108] In the above scheme, the exhaust channel 41 of the exhaust structure 40 is simultaneously connected to the first pressure relief mechanisms 21 of multiple battery cells 20. Compared with the one-to-one arrangement of multiple exhaust structures 40 and multiple battery cells 20, it helps to simplify the overall structure of the exhaust structure 40 and the battery cells 20, reduce its occupancy of the internal space of the battery device 100, and reduce costs.
[0109] Fig.11 A top view of a battery device provided in some embodiments of the present application.
[0110] like Fig.11 As shown, in some embodiments, there are multiple exhaust structures 40 , and the exhaust channel 41 of each exhaust structure 40 is connected to the first pressure relief mechanisms 21 of multiple battery cells 20 .
[0111] The number of exhaust structures 40 can be flexibly set according to actual needs. Among the multiple exhaust structures 40 , each exhaust structure 40 is formed with an exhaust channel 41 , wherein the exhaust channel 41 of each exhaust structure 40 is connected to the first pressure relief mechanisms 21 of the multiple battery cells 20 .
[0112] In the above scheme, a plurality of exhaust structures 40 are provided, and the exhaust channels 41 of each exhaust structure 40 are connected to the first pressure relief mechanisms 21 of a plurality of battery cells 20. This can improve the overall exhaust efficiency of the battery device 100 on the basis of simplifying the structure of the exhaust structure 40 and the battery cells 20. When a large-scale thermal runaway of the battery cells 20 occurs in the battery device 100, the high-temperature and high-pressure gas generated in the battery cells 20 can be quickly exhausted through the exhaust channels 41 of the plurality of exhaust structures 40, thereby improving the safety performance of the battery device 100.
[0113] Please continue reading Fig.11 In some embodiments, the battery cells 20 connected to the exhaust channel 41 of the same exhaust structure 40 are distributed along the first direction X to form a battery cell group 26. The exhaust structure 40 extends along the first direction X. The battery cell groups 26 and the exhaust structures 40 are distributed along the second direction Y. The first direction X and the second direction Y are intersected.
[0114] Specifically, the first direction X and the second direction Y are arranged to intersect, and preferably the first direction X and the second direction Y are perpendicular to each other. When the first direction X and the second direction Y are perpendicular to each other, the first direction X can be one of the length direction and the width direction of the battery device 100, and the second direction Y is the other. A plurality of battery cells 20 can form a plurality of battery cell groups 26 distributed along the second direction Y, and each battery cell group 26 includes a plurality of battery cells 20 distributed along the first direction X, wherein each battery cell 20 in the same battery cell group 26 is connected to the exhaust channel 41 of the same exhaust structure 40, so that the exhaust structure 40 can extend approximately in a straight line along the first direction X. It should be noted that the number of battery cells 20 in each battery cell group 26 can be the same or different, and correspondingly, the length of each exhaust structure 40 can be the same or different.
[0115] In the above scheme, the battery cells 20 connected to the exhaust channel 41 of the same exhaust structure 40 are distributed along the first direction X, so that the exhaust structure 40 extends in a straight line along the first direction X, which can shorten the length of the exhaust structure 40 and reduce the space occupied by the exhaust structure 40. At the same time, compared with the exhaust structure 40 extending in a curved manner, the exhaust channel 41 of the exhaust structure 40 extending in a straight line usually extends in a straight line, so that it is also convenient for gas to flow in the exhaust channel 41. The battery cell groups 26 and the exhaust structures 40 are distributed along the second direction Y, which can improve the neatness of the interior of the battery device 100 and reduce the overall space occupied by the components in the battery device 100.
[0116] In some embodiments, the exhaust structures 40 are separated from each other, and each exhaust structure 40 is provided with an exhaust port, which is connected to the exhaust channel 41 of the corresponding exhaust structure 40; or, the exhaust channels 41 of each exhaust structure 40 are connected to each other, and at least one of the exhaust structures 40 is formed with an exhaust port, which is connected to the exhaust channel 41.
[0117] It is understandable that when the exhaust channels 41 of each exhaust structure 40 are interconnected, the battery device 100 may further include a connecting structure for connecting the exhaust channels 41 of two adjacent exhaust structures 40, wherein a connecting channel is formed in the connecting structure, and the exhaust channels 41 of two adjacent exhaust structures 40 may be connected through the connecting channel. The connecting structure and the exhaust structure 40 may be an integrally formed structure or a separate structure.
[0118] In the above scheme, the exhaust channels 41 of each exhaust structure 40 are interconnected, and at least one of the exhaust structures 40 is formed with an exhaust port, so that the gas in the exhaust channel 41 can be discharged through the exhaust port, avoiding the accumulation of high-temperature and high-pressure gas and affecting the safety of the battery device 100. Alternatively, the exhaust structures 40 are separated from each other, and their exhaust channels 41 are isolated from each other and not connected, so that the mutual interference between the battery cells 20 can be reduced, and the high-temperature and high-pressure gas generated when some battery cells 20 have thermal runaway can be avoided. Flow to other battery cells 20 through the exhaust channel 41, thereby affecting the safety of other battery cells 20. In addition, each exhaust structure 40 is provided with an exhaust port, so that the high-temperature and high-pressure gas in each exhaust channel 41 can be discharged through the corresponding exhaust port, thereby accelerating the exhaust efficiency and improving the safety performance of the battery device 100.
[0119] Fig.12 Another isometric view of a battery device provided for some embodiments of the present application.
[0120] See also Fig.12 In some embodiments, the battery device 100 further includes a box body and a second pressure relief mechanism 50 , the box body is formed with a receiving cavity, the exhaust structure 40 and each battery cell 20 are received in the receiving cavity, the second pressure relief mechanism 50 is disposed in the box body, and the exhaust port is connected to the second pressure relief mechanism 50 .
[0121] It is understandable that when the exhaust port is connected to the second pressure relief mechanism 50, the pressure relief port 211 of the second pressure relief mechanism 50 is opened when the internal air pressure of the corresponding exhaust channel 41 reaches a threshold value, so that the gas in the exhaust channel 41 can be discharged, and the pressure relief port 211 of the second pressure relief mechanism 50 is closed when the internal air pressure of the corresponding exhaust channel 41 does not reach the threshold value, and the gas in the exhaust channel 41 is contained in the exhaust channel 41. In the battery device 100, the number of the second pressure relief mechanism 50 can be one or more. When the number of the exhaust ports is multiple, the number of the second pressure relief mechanism 50 can be multiple, and each second pressure relief mechanism 50 is arranged one-to-one in each exhaust port.
[0122] In the above scheme, a second pressure relief mechanism 50 is arranged on the box body of the battery device 100, so that the second pressure relief mechanism 50 is connected to the exhaust port of the exhaust structure 40. The second pressure relief mechanism 50 can be opened in time when the pressure inside the exhaust channel 41 is too high to quickly release the pressure and reduce the risk of explosion of the exhaust structure 40 due to excessive air pressure.
[0123] In some embodiments, the exhaust structure 40 is a high temperature resistant air bag.
[0124] Specifically, the exhaust structure 40 is a high temperature resistant air bag, which can be made of a plastic high temperature resistant material. Preferably, the exhaust structure 40 can be made of an elastic high temperature resistant material, so that after being deformed by air pressure impact and bulging in a direction away from the first pressure relief mechanism 21, the exhaust structure 40 can automatically restore the deformation to a contracted state in a direction close to the first pressure relief mechanism 21 after the exhaust is completed.
[0125] In the above scheme, the exhaust structure 40 is set as a high-temperature resistant air bag. On the one hand, the exhaust structure 40 can be more easily bulged in the direction away from the first pressure relief mechanism 21 under the action of air pressure, so that the exhaust channel 41 can be used for gas circulation. On the other hand, the risk of the exhaust structure 40 being melted by high-temperature and high-pressure gas can be reduced, thereby increasing the service life of the exhaust structure 40.
[0126] In the second aspect, the present application also provides an electric device, including the battery device 100. The electric device provided by the present application has the technical effect of the technical solution of the battery device 100 in any of the above embodiments, and the explanation of the same or corresponding structures and terms as the above embodiments will not be repeated here.
[0127] The embodiment of the present application provides a battery device, including at least one battery cell 20 and an exhaust structure 40, wherein the battery cell 20 includes a first pressure relief mechanism 21; an exhaust channel 41 is formed in the exhaust structure 40, and the exhaust channel 41 is connected to the first pressure relief mechanism 21 of at least one battery cell 20, and the exhaust structure 40 is a flexible structure. The exhaust structure 40 is formed with an exhaust port, and the exhaust port is connected to the exhaust channel 41. The first pressure relief mechanism 21 includes a pressure relief port 211, and the exhaust structure 40 is formed with an air inlet, and the exhaust structure 40 near the air inlet is arranged around the circumference of the pressure relief port 211 and is sealed and connected to the first pressure relief mechanism 21, and the air inlet is connected to the pressure relief port 211.
[0128] 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 aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.
Claims
1. A battery device, characterized in that: include: at least one battery cell, the battery cell comprising a first pressure relief mechanism, the first pressure relief mechanism comprising a pressure relief port; An exhaust structure is provided at one side of the battery cell and connected to the battery cell, an exhaust channel is formed in the exhaust structure, the exhaust channel is communicated with a first pressure relief mechanism of at least one of the battery cells, an air inlet is formed in the exhaust structure, the exhaust structure close to the air inlet is arranged around the circumference of the pressure relief port and is sealed with the first pressure relief mechanism, the air inlet is communicated with the pressure relief port, and the exhaust structure is a flexible structure.
2. The battery device according to claim 1, characterized in that: At least a portion of the exhaust structure corresponding to the air inlet is disposed around the outer peripheral side of the first pressure relief mechanism, and at least a portion of the inner wall of the exhaust structure facing the air inlet is sealed and connected to the outer peripheral side of the first pressure relief mechanism; or, At least a portion of the exhaust structure corresponding to the air inlet is located in the pressure relief port, and at least a portion of the outer wall of the exhaust structure facing away from the air inlet is attached to and sealedly connected to the inner wall of the pressure relief port.
3. The battery device according to claim 1, characterized in that: The battery device further comprises a sealant, and the exhaust structure is sealed and connected to the first pressure relief mechanism via the sealant.
4. The battery device according to claim 1, characterized in that: A slot is arranged around the outer circumference of the first pressure relief mechanism, and at least part of the exhaust structure corresponding to the air inlet is arranged around the outer circumference of the first pressure relief mechanism, and part of the exhaust structure is arranged in the slot.
5. The battery device according to claim 1, characterized in that: There are multiple battery cells, and the exhaust passage is connected to the first pressure relief mechanisms of the multiple battery cells.
6. The battery device according to claim 5, characterized in that: There are multiple exhaust structures, and the exhaust passage of each exhaust structure is connected to the first pressure relief mechanisms of multiple battery cells.
7. The battery device according to claim 6, characterized in that: The battery cells connected to the exhaust channel of the same exhaust structure are distributed along a first direction to form a battery cell group. The exhaust structure extends along the first direction. The battery cell groups and the exhaust structures are distributed along a second direction. The first direction intersects with the second direction.
8. The battery device according to claim 6, characterized in that: The exhaust structures are separated from each other, and each exhaust structure is provided with an exhaust port, and the exhaust port is connected to the exhaust channel corresponding to the exhaust structure; or, The exhaust passages of the exhaust structures are connected to each other, and at least one of the exhaust structures is formed with an exhaust port, which is connected to the exhaust passage.
9. The battery device according to claim 8, characterized in that: The battery device further includes a box body and a second pressure relief mechanism, wherein the box body is formed with a receiving chamber, wherein the exhaust structure and each of the battery cells are received in the receiving chamber, and the second pressure relief mechanism is disposed in the box body, and the exhaust port is communicated with the second pressure relief mechanism.
10. The battery device according to any one of claims 1 to 9, characterized in that: The exhaust structure is a high temperature resistant air bag.
11. An electrical device, characterized in that: A battery device comprising any one of claims 1 to 10.