Battery monomer, battery device and power utilization device

Abstract

The invention discloses a battery monomer, a battery device and a power utilization device. The battery monomer provided by the invention comprises a shell and an air leakage assembly, the shell comprises a wall part, the wall part is provided with an air vent communicating the interior and the exterior of the shell, the wall part comprises a fixing part, and the fixing part and the air vent are spaced; the air leakage assembly is located in the shell and comprises a shielding piece and a falling body connected with the shielding piece, the shielding piece is connected with the wall part and covers the exhaust hole, the falling body is fixedly connected with the fixing part, and the falling body is separated from the fixing part in the state that the fixing part is at least partially melted. At least part of the shielding piece is away from the wall part under the gravity effect of the falling body so that the exhaust hole can communicate with the interior of the shell. Therefore, the fixed part can be released from the fixed state with the falling body in a state of at least partially melting, and the falling body is far away from the wall part under the action of self gravity, so that at least part of the shielding piece is driven to be far away from the wall part, the exhaust hole is communicated with the interior of the shell, and the exhaust efficiency of the battery monomer is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery device and an electrical device. Background Art

[0002] Energy conservation and emission reduction are the key to sustainable development, which has promoted the adjustment of energy structure and the development and application of battery technology. The key to the development of battery technology lies in electrochemical energy storage technology, which has been widely used in portable electronics, electric vehicles and energy storage systems due to its high energy density, good cycle capacity, high operating voltage, environmental protection and low self-discharge.

[0003] During the use of battery cells, gas will be generated inside the outer shell of the battery cells. When the gas production rate of the battery cells is much greater than the exhaust rate, gas is easily accumulated inside the outer shell, causing the battery cells to swell or even explode. Summary of the invention

[0004] The main purpose of the present application is to provide a battery cell, a battery device and an electrical device, aiming to solve the above-mentioned technical problems existing in the prior art.

[0005] To solve the above-mentioned problems, the present application provides a battery cell, which includes a shell and a venting assembly, the shell includes a wall portion, the wall portion is provided with an exhaust hole connecting the inside and outside of the shell, the wall portion includes a fixing portion, and the fixing portion is spaced apart from the exhaust hole; the venting assembly is located inside the shell, the venting assembly includes a shielding member and a falling body connected to the shielding member, the shielding member is connected to the wall portion and covers the exhaust hole, the falling body is fixedly connected to the fixing portion, wherein the falling body is separated from the fixing portion when the fixing portion is at least partially melted, and at least part of the shielding member is moved away from the wall portion under the action of the gravity of the falling body itself, so that the exhaust hole is connected to the inside of the shell. Thus, the fixing portion can fix the falling body in an unmelted state, so that the covering piece covers the exhaust hole, and the fixing portion can release the fixing state with the falling body when it is at least partially melted. The falling body moves away from the wall under the action of its own gravity, driving at least part of the covering piece away from the wall, so that the exhaust hole is connected with the inside of the shell, and the gas inside the shell can be discharged to the outside of the shell through the exhaust hole, thereby improving the exhaust efficiency of the battery cell and alleviating the risk of swelling or even explosion of the battery cell due to too low exhaust speed of the gas inside the shell.

[0006] In some embodiments, the shielding member includes a first component and a second component that are connected to each other, the first component is connected to the wall, the second component is connected to the falling body, at least one of the first component and the second component blocks the exhaust hole, and at least a portion of the second component is used to move away from the wall under the weight of the falling body. Thus, by cooperating with the first component and the fixing portion, when the fixing portion is connected to the falling body, the connection stability between the shielding member and the wall is improved, thereby better blocking the exhaust hole. When the fixing portion is at least partially melted, at least a portion of the second component moves away from the wall under the weight of the falling body, so that the exhaust hole is connected to the inside of the shell, thereby improving the exhaust efficiency of the battery cell.

[0007] In some embodiments, when the falling body is connected to the fixing part, the second component blocks the exhaust hole. Thus, the exhaust hole can be blocked by the second component, which facilitates the second component to directly connect to the exhaust hole after the falling body moves away from the wall under the action of its own gravity, thereby alleviating the risk of exhaust hole connection failure, simplifying the structure, and improving the exhaust efficiency of the battery cell.

[0008] In some embodiments, the first component is provided with a gas channel, and the gas channel is connected to the exhaust hole. When the falling body is connected to the fixed part, the second component blocks the gas channel. When the falling body is separated from the fixed part, the exhaust hole is connected to the inside of the shell through the gas channel. Therefore, when the falling body is connected to the fixed part, the gas channel on the first component can be blocked by the second component, thereby isolating the exhaust hole from the inside of the shell, alleviating the risk of accidental communication between the inside of the shell and the outside through the exhaust hole. When the falling body is separated from the fixed part, the exhaust hole and the inside of the shell can be connected by the second component away from the wall to exhaust gas, thereby improving the flexibility of the deflation component.

[0009] In some embodiments, the shielding member includes an intermediate deformation portion, which is connected between the first component and the second component, and the intermediate deformation portion is deformed under the weight of the falling body itself to make at least part of the second component away from the wall. Thus, the first component and the second component can be connected by the intermediate deformation portion, and the connection stability of the first component and the second component can be improved when the falling body is connected to the fixed portion, and the intermediate deformation portion is deformed when the falling body is separated from the fixed portion, so as to facilitate at least part of the second component to be away from the wall.

[0010] In some embodiments, the intermediate deformation part is elastic. Thus, by making the intermediate deformation part elastic, when the falling body is separated from the fixed part, the intermediate deformation part is more likely to deform, reducing the obstruction of the intermediate deformation part to the second component, further facilitating at least part of the second component to be away from the wall, and improving the reliability of the deflation assembly.

[0011] In some embodiments, the wall portion includes an end cap and a lower plastic part, the lower plastic part is located inside the housing and fixedly connected to the end cap, and the fixing portion is arranged on the lower plastic part. Thus, by arranging the fixing portion on the lower plastic part, the structural stability of the fixing portion in an unmelted state is improved, and at the same time, there is no need to arrange an additional structure inside the housing for supporting the fixing portion, so the structure is simple and the cost is saved.

[0012] In some embodiments, the battery cell includes a pressure relief valve, which is arranged on the wall and spaced apart from the exhaust hole. Thus, when the gas content inside the shell is high, the pressure relief valve and the exhaust assembly cooperate with each other to better adjust the gas pressure inside the shell, improve the exhaust efficiency of the battery cell, and further improve the reliability of the battery cell.

[0013] In some embodiments, the battery cell further comprises two electrode columns, and the pressure relief valve is located between the two electrode columns in the length direction of the wall portion. Thus, by arranging the pressure relief valve between the two electrode columns in the length direction of the wall portion, the pressure relief valve can release pressure more evenly when there is more gas inside the shell, thereby improving the reliability of the battery cell.

[0014] In some embodiments, there are multiple exhaust holes and gas leakage components, and each gas leakage component corresponds to one exhaust hole. Thus, by providing multiple exhaust holes and gas leakage components, the ability of the gas leakage components and the exhaust holes to regulate the air pressure inside the housing is further improved, thereby improving the exhaust efficiency of the battery cell.

[0015] In some embodiments, the falling bodies of at least two deflation components are fixedly connected to one fixing part. Thus, by fixing the falling bodies of at least two deflation components to one fixing part, the one fixing part can release the falling bodies of at least two deflation components in a state of at least partial melting, thereby reducing the number of fixing parts required to be provided and saving costs.

[0016] In order to solve the above problems, the present application also provides a battery device, which includes a battery box and the above-mentioned battery cells, and the battery cells are arranged in the battery box.

[0017] In order to solve the above problems, the present application also provides an electrical device, which includes the above battery device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments 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 paying creative work.

[0019] Figure 1is a schematic structural diagram of a vehicle according to one or more embodiments of the present application; Figure 2 is a schematic diagram of an exploded structure of a battery device according to one or more embodiments of the present application; Figure 3 is a schematic diagram of an exploded structure of a battery cell according to one or more embodiments of the present application; Figure 4 is a schematic diagram of an exploded structure of a wall portion of a battery cell according to one or more embodiments of the present application; Figure 5 is a schematic diagram of a battery cell from a first perspective according to one or more embodiments of the present application; Figure 6 is a second perspective schematic diagram of a battery cell according to one or more embodiments of the present application; Figure 7 is a first structural schematic diagram of a battery cell in which a fixing portion is not melted according to one or more embodiments of the present application; Figure 8 is based on Figure 7 A schematic diagram of the structure of a battery cell after a fixed portion of the battery cell is partially melted; Fig. 9 is a second structural schematic diagram of a battery cell in which a fixing portion is not melted according to one or more embodiments of the present application; Fig.10 is based on Fig. 9 The schematic diagram of the structure of the battery cell shown is after the fixing part of the battery cell is partially melted.

[0020] Figure numbers: vehicle 1; battery device 2; controller 3; motor 4; battery box 20; first part 21; second part 22; battery cell 10; shell 100; wall 110; exhaust hole 111; fixing part 112; end cover 113; lower plastic part 114; shell 120; air release assembly 200; shielding member 210; first part 211; gas channel 2111; second part 212; intermediate deformation part 213; falling body 220; electrode assembly 300; pressure relief valve 400; electrode column 500. DETAILED DESCRIPTION

[0021] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0022] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0023] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0024] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations 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. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0025] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may 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 article generally indicates that the associated objects before and after are in an "or" relationship.

[0026] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0027] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0028] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like 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 mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0029] At present, from the perspective of market development, the application of batteries is becoming more and more extensive. Batteries are not only used in energy storage power systems such as hydropower, thermal power, wind power and solar power stations, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, electric cars, as well as military equipment and aerospace and other fields. With the continuous expansion of battery application areas, its market demand is also constantly expanding.

[0030] Batteries mentioned in this field can be divided into disposable batteries and rechargeable batteries according to whether they are rechargeable. Disposable batteries (Primary Battery) are also called "disposable" batteries and original batteries, because after they are exhausted, they can no longer be recharged and can only be discarded. Rechargeable batteries are also called secondary batteries (Secondary Battery) or secondary batteries, storage batteries. The manufacturing materials and processes of rechargeable batteries are different from those of primary batteries. Its advantage is that it can be recycled many times after charging, and the output current load capacity of rechargeable batteries is higher than that of most disposable batteries. The common types of rechargeable batteries at present are: lead-acid batteries, nickel-metal hydride batteries and lithium-ion batteries. Lithium-ion batteries have the advantages of light weight, large capacity (the capacity is 1.5 to 2 times that of nickel-metal hydride batteries of the same weight), no memory effect, and have a very low self-discharge rate. Therefore, even though the price is relatively high, they are still widely used. Lithium-ion batteries are currently also widely used in pure electric vehicles and hybrid vehicles. The capacity of lithium-ion batteries used for this purpose is relatively low, but they have a larger output and charging current, and also have a longer service life, but the cost is higher.

[0031] The battery described in the embodiments of the present application refers to a rechargeable battery or a disposable battery. The embodiments disclosed in the present application will be described below mainly by taking a lithium-ion battery as an example. It should be understood that the embodiments disclosed in the present application are applicable to any other appropriate type of rechargeable battery. The battery mentioned in the embodiments disclosed in the present application can be directly or indirectly applied to an appropriate device to power the device.

[0032] The present application provides an electric device, which may include but is not limited to mobile phones, tablets, laptops, electric toys, electric tools, battery cars, electric cars, ships, spacecraft, etc. Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc., and spacecraft may include airplanes, rockets, space shuttles and spacecraft, etc. Among them, the electric device may include a battery device, and the electric device may provide electric energy through the battery device to realize the corresponding function.

[0033] Taking the electrical device as an electric vehicle as an example, the electric vehicle may include a battery device.

[0034] Please refer to Figure 1 , Figure 1 is a schematic diagram of the structure of a vehicle according to one or more embodiments of the present application.

[0035] The vehicle 1 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 2 is provided inside the vehicle 1, and the battery device 2 may be provided at the bottom, head or tail of the vehicle 1. The battery device 2 may be used to power the vehicle 1, for example, the battery device 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 3 and a motor 4, and the controller 3 is used to control the battery device 2 to power the motor 4, for example, for starting, navigating and driving the vehicle 1.

[0036] In some embodiments of the present application, the battery device 2 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0037] In order to improve the performance of the electrical device, the present application also provides a battery device, see Figure 2 , Figure 2 is a schematic diagram of the exploded structure of a battery device according to one or more embodiments of the present application.

[0038] The shape of the battery device 2 may include but is not limited to a square cylindrical shape or other arbitrary shapes.

[0039] In some embodiments, the battery device 2 includes a battery box 20 and a battery cell 10, and the battery cell 10 is disposed in the battery box 20. The battery box 20 is used to provide a storage space for the battery cell 10, and the battery box 20 can adopt a variety of structures. In some embodiments, the battery box 20 may include a first part 21 and a second part 22, the first part 21 and the second part 22 cover each other, and the first part 21 and the second part 22 jointly define a storage space 130 for accommodating the battery cell. The second part 22 may be a hollow structure with one end open, and the first part 21 may be a plate-like structure, and the first part 21 covers the open side of the second part 22, so that the first part 21 and the second part 22 jointly define a storage space; the first part 21 and the second part 22 may also be hollow structures with one side open, and the open side of the first part 21 covers the open side of the second part 22.

[0040] In the battery device 2, there can be multiple battery cells 10, and the multiple battery cells 10 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 10 are both connected in series and in parallel. The multiple battery cells 10 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 10 is accommodated in the battery box 20; of course, the battery device 2 can also be a battery module formed by connecting multiple battery cells 10 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 accommodated in the battery box 20. The battery device 2 can also include other structures, for example, the battery device 2 can also include a busbar component for realizing electrical connection between the multiple battery cells 10.

[0041] The manufacturing methods of the battery cell 10 include stacking and winding, that is, the battery cell 10 is divided into stacking cells and winding cells. The stacking battery has a uniform current collection effect, a small internal resistance of the battery, and a large specific power, but in order to improve the precision, the mold precision is extremely high, the equipment investment is high, and the process is relatively complex, and the production efficiency is low. The winding battery is simple to make, and the equipment precision requirements for the production and assembly process are general, the production efficiency is high, and the cost is low. In terms of performance, the winding battery has excellent high and low temperature performance, charges very quickly, has an ultra-long life, a stable high output voltage, a solid structure, and strong shock resistance.

[0042] The battery cell 10 refers to the smallest unit that makes up the battery device 2. The battery cell 10 may include a shell, an electrode assembly, and other functional components. The shell can form an internal environment of the battery cell 10 and isolate the internal environment of the battery cell 10 from the external environment. It is understandable that the shell can provide support and protection for the components in the internal environment of the battery cell 10. The electrode assembly is a component in the battery cell 10 where electrochemical reactions occur. One or more electrode assemblies may be included in the shell. The electrode assembly is mainly formed by winding or stacking positive and negative electrode sheets, and an isolation member is usually provided between the positive and negative electrode sheets.

[0043] During the use of the battery cell 10 , when the gas generation rate of the battery cell 10 is much greater than the gas exhaust rate, the gas is easily accumulated inside the shell, causing the battery cell 10 to swell or even explode.

[0044] In order to solve the technical problems existing in the related art, the present application provides a battery cell, a battery device and an electric device. The battery cell has a gas release assembly located inside a shell, a falling body in the gas release assembly is connected to a fixed part on the shell wall, and when the fixed part is at least partially melted, the falling body drives at least part of the shielding member away from the wall under the action of its own gravity, thereby connecting the exhaust hole on the wall and the inside of the shell, thereby improving the exhaust efficiency of the battery cell.

[0045] Specifically, see Figure 3-Figure 6 , Figure 3 is a schematic diagram of an exploded structure of a battery cell according to one or more embodiments of the present application; Figure 4 is a schematic diagram of an exploded structure of a wall portion of a battery cell according to one or more embodiments of the present application; Figure 5 is a schematic diagram of a battery cell from a first perspective according to one or more embodiments of the present application; Figure 6 is a schematic diagram of a battery cell from a second perspective according to one or more embodiments of the present application.

[0046] The battery cell 10 includes a shell 100 and a venting assembly 200, the shell 100 includes a wall portion 110, the wall portion 110 is provided with an exhaust hole 111 connecting the inside and outside of the shell 100, the wall portion 110 includes a fixing portion 112, and the fixing portion 112 is spaced apart from the exhaust hole 111; the venting assembly 200 is located inside the shell 100, the venting assembly 200 includes a shielding member 210 and a falling body 220 connected to the shielding member 210, the shielding member 210 is connected to the wall portion 110 and covers the exhaust hole 111, the falling body 220 is fixedly connected to the fixing portion 112, wherein the falling body 220 is separated from the fixing portion 112 when the fixing portion 112 is at least partially melted, and at least part of the shielding member 210 is away from the wall portion 110 under the action of the gravity of the falling body 220 itself, so that the exhaust hole 111 is connected to the inside of the shell 100.

[0047] The housing 100 includes a wall portion 110. Exemplarily, when the shape of the housing 100 is a square, the wall portion 110 may be any one of the six side walls of the housing 100. The wall portion 110 is provided with an exhaust hole 111 connecting the inside and outside of the housing 100. In some application scenarios, the gas inside the housing 100 may be discharged to the outside of the housing 100 through the exhaust hole 111. The wall portion 110 includes a fixing portion 112, which may be made of a material with a lower melting point. It should be noted that when the gas content inside the housing 100 is high, the temperature inside the housing 100 will gradually rise. When the temperature inside the housing 100 rises to the melting point of the fixing portion 112, at least part of the fixing portion 112 will melt, thereby causing the fixing portion 112 to fail in structure. It is understandable that the degassing assembly 200 covers the exhaust hole 111 through the shielding member 210, so that the exhaust hole 111 and the inside of the shell 100 can be isolated by the shielding member 210 when the structure of the fixing portion 112 is not invalid, thereby alleviating the risk of substances inside and outside the shell 100 passing through the exhaust hole 111 when the battery cell 10 is in normal working state. When the gas content inside the shell 100 is high, so that the temperature inside the shell 100 rises, causing the fixing portion 112 to at least partially melt, the fixing portion 112 can no longer maintain support and connection to the falling body 220, and the falling body 220 will move away from the wall 110 under the action of its own gravity, and drive at least part of the shielding member 210 away from the wall 110, so that the exhaust hole 111 is connected with the inside of the shell 100, and then the gas inside the shell 100 is discharged to the outside of the shell 100 through the exhaust hole 111. The falling body 220 has a certain mass, and its mass is sufficient to drive at least part of the shielding member 210 to fall. For example, the falling body 220 can be of any shape. Optionally, the falling body 220 can include but is not limited to an insulating object, etc. Specifically, the falling body 220 can be a metal sphere. Further, the connection method between the shielding member 210 and the wall portion 110 can include but is not limited to welding, etc. For example, at least part of the shielding member 210 can be welded to the wall portion 110 with a relatively small bonding force, and the gravity on the falling body 220 can be greater than the bonding force between the shielding member 210 and the wall portion 110, so that it is convenient for the falling body 220 to drive at least part of the shielding member 210 away from the wall portion 110.

[0048] Through the above-mentioned embodiment, the fixing portion 112 can fix the falling body 220 in an unmelted state, so that the covering member 210 covers the exhaust hole 111, and the fixing portion 112 is released from the fixed state with the falling body 220 when it is at least partially melted. The falling body 220 moves away from the wall portion 110 under the action of its own gravity, driving at least part of the covering member 210 away from the wall portion 110, so that the exhaust hole 111 is connected to the inside of the outer shell 100, and the gas inside the outer shell 100 can be discharged to the outside of the outer shell 100 through the exhaust hole 111, thereby improving the exhaust efficiency of the battery cell 10 and alleviating the risk of swelling or even explosion of the battery cell 10 due to too low exhaust speed of the gas inside the outer shell 100.

[0049] In some embodiments, the shielding member 210 includes a first component 211 and a second component 212 connected to each other, the first component 211 is connected to the wall portion 110, the second component 212 is connected to the falling body 220, at least one of the first component 211 and the second component 212 blocks the exhaust hole 111, and at least a portion of the second component 212 is used to move away from the wall portion 110 under the action of the gravity of the falling body 220. In some application scenarios, the second component 212 can extend in the direction of the interval between the first component 211 and the fixing portion 112. When the falling body 220 is connected to the fixing portion 112, the first component 211 can be used to fix one end of the second component 212, and the fixing portion 112 can fix the other end of the second component 212 through the falling body 220, thereby improving the installation stability of the second component 212. However, it should be noted that the connection method between the falling body 220 and the second component 212 can be a rigid connection or a flexible connection. When the connection method between the falling body 220 and the second component 212 is a flexible connection, for example, when the second component 212 is connected to the falling body 220 through a flexible wiring harness, the first component 211 can provide certain fixation and support for the second component 212. In some embodiments, the first component 211 can be fixedly connected to the wall portion 110 and movably connected to the second component 212, that is, when the falling body 220 is connected to or separated from the fixed portion 112, the first component 211 can be fixed relative to the wall portion 110; when the falling body 220 is connected to the fixed portion 112, the second component 212 can remain fixed relative to the first component 211 and the wall portion 110; when the falling body 220 is separated from the fixed portion 112, at least a portion of the second component 212 can undergo changes in position and posture such as translation and rotation relative to the first part 21 and the wall portion 110 under the action of the gravity of the falling body 220 itself, thereby moving away from the wall portion 110. When the falling body 220 is connected to the fixing portion 112, the second component 212 can be directly connected to the wall portion 110, or indirectly connected to the wall portion 110 through the first component 211. Exemplarily, the first component 211 and the second component 212 can be connected to the wall portion 110 by methods including but not limited to welding. Taking welding as an example, the welding bonding force between the first component 211 and the wall portion 110 can be set to be larger, and the welding bonding force between the second component 212 and the wall portion 110 can be set to be smaller. The gravity exerted on the falling body 220 can be greater than the bonding force between the second component 212 and the wall portion 110 and smaller than the bonding force between the first component 211 and the wall portion 110, thereby facilitating the falling body 220 to drive the second component 212 to separate from the wall portion 110, while failing to separate the first component 211 from the wall portion 110. In some application scenarios, the exhaust hole 111 may be blocked by the first component 211 alone, the exhaust hole 111 may be blocked by the second component 212 alone, or the exhaust hole 111 may be blocked by the first component 211 and the second component 212 together.Therefore, by cooperating with the first component 211 and the fixing portion 112, when the fixing portion 112 is connected to the falling body 220, the connection stability between the shielding member 210 and the wall portion 110 is improved, thereby better blocking the exhaust hole 111. When the fixing portion 112 is at least partially melted, at least part of the second component 212 moves away from the wall portion 110 under the action of the gravity of the falling body 220 itself, so that the exhaust hole 111 is connected to the inside of the outer shell 100, thereby improving the exhaust efficiency of the battery cell 10.

[0050] In some embodiments, the wall portion 110 includes an end cap 113 and a lower plastic part 114, the lower plastic part 114 is located inside the housing 100 and is fixedly connected to the end cap 113, and the fixing portion 112 is arranged on the lower plastic part 114. The housing 100 may include a shell 120 and an end cap 113, the end cap 113 refers to a component that covers the opening of the shell 120 to isolate the internal environment of the battery cell 10 from the external environment. Without limitation, the shape of the end cap 113 may be adapted to the shape of the shell 120 to match the shell 120. Optionally, the end cap 113 may be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 113 is not easily deformed when it is squeezed and collided, so that the battery cell 10 can have a higher structural strength and the safety performance can also be improved. Functional components such as electrode terminals may be arranged on the end cap 113. The electrode terminal may be used to be electrically connected to the electrode assembly 300 for outputting or inputting the electrical energy of the battery cell 10. In some embodiments, the electrode terminal may include a pole. The poles may include positive poles and negative poles for outputting current and connecting to external circuits. In some embodiments, the end cap 113 may also be provided with an explosion-proof part for releasing the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value. The material of the end cap 113 may include but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. In some embodiments, an insulating member may also be provided on the inner side of the end cap 113, and the insulating member may be used to isolate the electrical connection components in the housing 120 from the end cap 113 to reduce the risk of short circuit. Exemplarily, the insulating member may be plastic, rubber, etc.

[0051] The shell 120 is a component used to cooperate with the end cap 113 to form the internal environment of the battery cell 10, wherein the formed internal environment can be used to accommodate the electrode assembly 300, the electrolyte and other components. The shell 120 and the end cap 113 can be independent components, and an opening can be set on the shell 120, and the internal environment of the battery cell 10 is formed by covering the opening with the end cap 113 at the opening. Without limitation, the end cap 113 and the shell 120 can also be integrated. Specifically, the end cap 113 and the shell 120 can form a common connection surface before other components are put into the shell, and when the interior of the shell 100 needs to be encapsulated, the end cap 113 is covered with the shell 120. The shell 120 can be of various shapes and sizes, such as a rectangular parallelepiped, a cylindrical shape, a hexagonal prism, etc. Specifically, the shape of the shell 120 can be determined according to the specific shape and size of the electrode assembly 300. The material of the shell 120 may include but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0052] The lower plastic part 114 can be fitted on the side of the end cap 113 facing the inside of the housing 100. The lower plastic part 114 can be prefabricated with plastic or assembled from various plastic parts, and the material of the lower plastic part 114 can include insulating materials. The lower plastic part 114 can provide insulation performance to improve the electrical insulation between the inside of the housing 100 and the wall 110. In addition, the lower plastic part 114 can also fix and protect the electrode assembly 300 inside the housing 100, reducing the risk of disconnection caused by displacement of the electrode assembly 300 and other components inside the housing 100 during transportation and use of the battery cell 10, especially in a vibration environment. The connection method between the lower plastic part 114 and the wall 110 includes but is not limited to welding, bonding or clamping. Specifically, the fixing part 112 can be arranged on the side of the lower plastic part 114 away from the end cap 113, so as to facilitate the connection of the fixing part 112 with the falling body 220. Therefore, by setting the fixing part 112 on the lower plastic part 114, the structural stability of the fixing part 112 in the unmelted state is improved, and there is no need to set up an additional structure for supporting the fixing part 112 inside the housing 100, which is simple in structure and saves costs.

[0053] In some embodiments, the shielding member 210 includes an intermediate deformation portion 213, which is connected between the first component 211 and the second component 212. The intermediate deformation portion 213 is deformed under the gravity of the falling body 220 to make at least part of the second component 212 away from the wall 110. Exemplarily, the intermediate deformation portion 213 may include but is not limited to a film and a spring, etc. It is understandable that the first component 211 and the second component 212 are connected to each other through the intermediate deformation portion 213, so that the second component 212 is more likely to change its position and posture such as translation or rotation relative to the first component 211, thereby facilitating at least the second component 212 to be driven away from the wall 110 by the falling body 220. Thus, the first component 211 and the second component 212 can be connected through the intermediate deformation portion 213, the connection stability of the first component 211 and the second component 212 can be improved when the falling body 220 is connected to the fixing portion 112, and the falling body 220 can be deformed when it is separated from the fixing portion 112, so as to facilitate at least part of the second component 212 to move away from the wall portion 110.

[0054] In some embodiments, the intermediate deformation part 213 is elastic. For example, the intermediate deformation part 213 may include but is not limited to a spring, a spring sheet, etc. Specifically, taking the intermediate deformation part 213 as a spring as an example, one end of the spring may be sleeved on the first component 211, and the other end of the spring may be sleeved on the second component 212. When the falling body 220 is separated from the fixing part 112, the middle part of the spring may be bent under the gravity of the falling body 220 itself, so that the second component 212 is away from the wall 110. Therefore, by making the intermediate deformation part 213 elastic, when the falling body 220 is separated from the fixing part 112, the intermediate deformation part 213 is more likely to deform, reducing the obstruction of the intermediate deformation part 213 to the second component 212, further facilitating at least part of the second component 212 to be away from the wall 110, and improving the reliability of the deflation component 200.

[0055] In some embodiments, the number of the exhaust holes 111 and the air release components 200 is multiple, and each air release component 200 corresponds to one exhaust hole 111. Exemplarily, the number of the exhaust holes 111 can be two, three, four or more, and the number of the air release components 200 can also be two, three, four or more. Thus, by providing multiple exhaust holes 111 and air release components 200, the air release components 200 and the exhaust holes 111 can further improve the ability to adjust the internal air pressure of the housing 100, thereby improving the exhaust efficiency of the battery cell 10.

[0056] In some embodiments, the falling bodies 220 of at least two deflation components 200 are fixedly connected to one fixing portion 112. The falling bodies 220 of two, three, four or more deflation components 200 may be fixedly connected to one fixing portion 112. Exemplarily, taking the case where the falling bodies 220 of two deflation components 200 are fixedly connected to one fixing portion 112 as an example, the two deflation components 200 may be respectively located on both sides of one fixing portion 112, so that the falling bodies 220 of the two deflation components 200 are respectively connected to both ends of the fixing portion 112. Specifically, the two deflation components 200 may be mirror-symmetrical relative to the fixing portion 112. Thus, by fixing the falling bodies 220 of at least two deflation components 200 to one fixing portion 112, one fixing portion 112 can release the falling bodies 220 of at least two deflation components 200 in a state of at least partial melting, thereby reducing the number of fixing portions 112 required to be provided and saving costs.

[0057] In some embodiments, the battery cell 10 includes a pressure relief valve 400, which is disposed on the wall 110 and spaced from the exhaust hole 111. The pressure relief valve 400 can be used to release the internal pressure when the internal pressure or temperature of the battery cell 10 reaches a threshold value. For example, during multiple charge and discharge cycles of the battery cell 10, the shell 100 of the battery cell 10 may generate gas due to the side reaction of the electrochemical reaction. As the gas content increases, the gas pressure inside the shell 100 will also increase. The increase in the gas pressure inside the shell 100 is likely to cause the shell 100 of the battery cell 10 to deform, and the structural strength of the shell 100 is likely to fail. When the internal pressure of the battery cell 10 reaches the threshold value, the pressure relief valve 400 can be used to relieve the pressure inside the shell 100. It is understandable that the pressure relief valve 400 and the degassing assembly 200 can cooperate with each other to discharge the gas inside the shell 100 to the outside of the shell 100 when the gas content inside the shell 100 is high. Therefore, when the gas content inside the housing 100 is high, the pressure relief valve 400 and the degassing assembly 200 cooperate with each other to better adjust the gas pressure inside the housing 100, improve the exhaust efficiency of the battery cell 10, and further improve the reliability of the battery cell 10.

[0058] In some embodiments, the battery cell 10 further includes two electrode columns 500, and the pressure relief valve 400 is located between the two electrode columns 500 in the length direction of the wall 110. One of the two electrode columns 500 is a positive electrode column, and the other is a negative electrode column, and the positive electrode column and the negative electrode column are arranged on the wall 110. The pressure relief valve 400 is located between the two electrode columns 500 in the length direction of the wall 110. Specifically, the pressure relief valve 400 can be located at the midpoint of the line connecting the two electrode columns 500 on the length of the wall 110. When gas is generated inside the housing 100, the gas may accumulate more easily between the two electrode columns 500. The pressure relief valve 400 is located between the two electrode columns 500, which facilitates the pressure relief valve 400 to better detect the pressure change inside the housing 100, thereby releasing the pressure more evenly. Thus, by arranging the pressure relief valve 400 between the two electrode columns 500 in the length direction of the wall portion 110 , the pressure relief valve 400 can release pressure more evenly when there is a lot of gas inside the housing 100 , thereby improving the reliability of the battery cell 10 .

[0059] Combination Figure 7-Figure 8 , Figure 7 is a first structural schematic diagram of a battery cell in which a fixing portion is not melted according to one or more embodiments of the present application; Figure 8 is based on Figure 7 The schematic diagram of the structure of the battery cell shown is after the fixing part of the battery cell is partially melted.

[0060] In some embodiments, when the falling body 220 is connected to the fixing portion 112, the second component 212 blocks the exhaust hole 111. It is understandable that the second component 212 directly blocks the exhaust hole 111, and when the falling body 220 is separated from the fixing portion 112, at least part of the second component 212 is away from the wall portion 110, and the exhaust hole 111 can be directly connected, and the structure is relatively simple. Therefore, the exhaust hole 111 can be blocked by the second component 212, which facilitates the second component 212 to directly connect to the exhaust hole 111 after being away from the wall portion 110 under the action of the weight of the falling body 220 itself, thereby alleviating the risk of the exhaust hole 111 failing to be connected, and the structure is simple, which improves the exhaust efficiency of the battery cell 10.

[0061] Combination Figure 9-10 , Fig. 9 is a second structural schematic diagram of a battery cell in which a fixing portion is not melted according to one or more embodiments of the present application; Fig.10 is based on Fig. 9 The schematic diagram of the structure of the battery cell shown is after the fixing part of the battery cell is partially melted.

[0062] In some embodiments, the first component 211 is provided with a gas channel 2111, and the gas channel 2111 is connected to the exhaust hole 111. When the falling body 220 is connected to the fixing part 112, the second component 212 blocks the gas channel 2111. When the falling body 220 is separated from the fixing part 112, the exhaust hole 111 is connected to the interior of the shell 100 through the gas channel 2111. Exemplarily, the gas channel 2111 can be formed inside the first component 211 and exposed through an opening at one end of the first component 211 facing the second component 212. When the falling body 220 is connected to the fixing portion 112, the second component 212 can be located at the opening of the gas channel 2111 to block the gas channel 2111. When the falling body 220 is separated from the fixing portion 112, the second component 212 is driven by the falling body 220 to move away from the wall 110, so that the gas channel 2111 is exposed inside the outer shell 100, and then the exhaust hole 111 and the inside of the outer shell 100 are connected through the gas channel 2111, so that the gas inside the outer shell 100 is released to the outside of the outer shell 100 through the exhaust hole 111. Therefore, when the falling body 220 is connected to the fixing portion 112, the gas channel 2111 on the first component 211 can be blocked by the second component 212, thereby isolating the exhaust hole 111 and the interior of the outer shell 100, thereby alleviating the risk of accidental connection between the interior and the exterior of the outer shell 100 through the exhaust hole 111. When the falling body 220 is separated from the fixing portion 112, the exhaust hole 111 and the interior of the outer shell 100 can be connected to exhaust through the second component 212 away from the wall portion 110, thereby improving the flexibility of the deflation component 200.

[0063] In summary, the battery cell 10 provided in the present application includes a shell 100 and a venting assembly 200, the shell 100 includes a wall portion 110, the wall portion 110 is provided with an exhaust hole 111 connecting the inside and outside of the shell 100, the wall portion 110 includes a fixing portion 112, and the fixing portion 112 is spaced apart from the exhaust hole 111; the venting assembly 200 is located inside the shell 100, the venting assembly 200 includes a shielding member 210 and a falling body 220 connected to the shielding member 210, the shielding member 210 is connected to the wall portion 110 and covers the exhaust hole 111, the falling body 220 is fixedly connected to the fixing portion 112, wherein the falling body 220 is separated from the fixing portion 112 when the fixing portion 112 is at least partially melted, and at least part of the shielding member 210 is away from the wall portion 110 under the action of the gravity of the falling body 220 itself, so that the exhaust hole 111 is connected to the inside of the shell 100. Thus, the fixing part 112 can fix the falling body 220 in an unmelted state, so that the shielding member 210 covers the exhaust hole 111, and the fixing part 112 is released from the fixing state with the falling body 220 in an at least partially melted state, and the falling body 220 moves away from the wall 110 under the action of its own gravity, driving at least part of the shielding member 210 away from the wall 110, so that the exhaust hole 111 is connected with the inside of the shell 100, and the gas inside the shell 100 can be discharged to the outside of the shell 100 through the exhaust hole 111, thereby improving the exhaust efficiency of the battery cell 10 and alleviating the risk of swelling or even explosion of the battery cell 10 due to too low exhaust speed of the gas inside the shell 100. Compared with other types of battery cells, the battery cell 10 of the present application has higher exhaust efficiency and higher reliability.

[0064] 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 cell, characterized in that: The battery cell comprises: The housing comprises a wall portion, the wall portion is provided with an exhaust hole communicating the interior and the exterior of the housing, the wall portion comprises a fixing portion, the fixing portion is spaced apart from the exhaust hole; A deflation component is located inside the shell, and includes a shielding member and a falling body connected to the shielding member, wherein the shielding member is connected to the wall portion and covers the exhaust hole, and the falling body is fixedly connected to the fixing portion, wherein the falling body is separated from the fixing portion when the fixing portion is at least partially melted, and at least part of the shielding member is moved away from the wall portion under the action of the gravity of the falling body itself, so that the exhaust hole is connected to the inside of the shell.

2. The battery cell according to claim 1, characterized in that: The shielding member includes a first component and a second component connected to each other, the first component is connected to the wall portion, the second component is connected to the falling body, at least one of the first component and the second component shields the exhaust hole, and at least a portion of the second component is used to move away from the wall portion under the action of the falling body's own gravity.

3. The battery cell according to claim 2, characterized in that: When the falling body is connected to the fixing portion, the second component covers the exhaust hole.

4. The battery cell according to claim 2, characterized in that: The first component is provided with a gas channel, and the gas channel is connected to the exhaust hole. When the falling body is connected to the fixed part, the second component blocks the gas channel. When the falling body is separated from the fixed part, the exhaust hole is connected to the inside of the shell through the gas channel.

5. The battery cell according to claim 2, characterized in that: The shielding member includes an intermediate deformation portion, which is connected between the first component and the second component. The intermediate deformation portion is deformed under the action of the gravity of the falling body so that at least a part of the second component is away from the wall.

6. The battery cell according to claim 5, characterized in that: The intermediate deformation portion has elasticity.

7. The battery cell according to claim 1, characterized in that: The wall portion includes an end cover and a lower plastic piece, wherein the lower plastic piece is located inside the shell and fixedly connected to the end cover, and the fixing portion is arranged on the lower plastic piece.

8. The battery cell according to claim 1, characterized in that: The battery cell includes a pressure relief valve disposed on the wall portion and spaced apart from the exhaust hole.

9. The battery cell according to claim 8, characterized in that: The battery cell further includes two electrode columns, and the pressure relief valve is located between the two electrode columns in the length direction of the wall portion.

10. The battery cell according to any one of claims 1 to 9, characterized in that: There are multiple exhaust holes and multiple air leaking components, and each air leaking component corresponds to one exhaust hole.

11. The battery cell according to claim 10, characterized in that: The falling bodies of at least two of the deflation assemblies are fixedly connected to one of the fixing parts.

12. A battery device, characterized in that: The battery device comprises a battery box and a battery cell according to any one of claims 1 to 11, wherein the battery cell is arranged in the battery box.

13. An electrical device, characterized in that: The electrical device comprises the battery device as claimed in claim 12.

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