Battery cell, battery, and electric device

Abstract

The application provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrode assembly, a one-way valve and a shielding piece. The shell has a wall part, the electrode assembly is accommodated in the shell, the one-way valve is arranged on the wall part, the one-way valve has a gas outlet for discharging gas inside the shell. The shielding piece is installed on the wall part, and along the thickness direction of the wall part, the shielding piece is located on the side of the one-way valve away from the electrode assembly, and the shielding piece covers the one-way valve. An exhaust passage is formed between the shielding piece and the wall part, and the exhaust passage is communicated with the gas outlet and the outside of the shell. The shielding piece can protect and shield the one-way valve, reduce the phenomenon of wear or damage of the one-way valve, reduce the risk of impurities in the external environment entering the one-way valve, and improve the appearance of the outer surface of the battery monomer. It is convenient to correspondingly connect detection elements and other components on the side of the shielding piece away from the one-way valve.

Description

[0001] Cross-reference of related applications

[0002] This application claims priority to Chinese patent application 2023107269094, filed on June 16, 2023, entitled “Battery Cell, Battery and Electrical Device”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery, and an electrical device. Background Technology

[0004] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, power batteries, as the power source, play an irreplaceable and crucial role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of reliability and service life.

[0005] In battery technology, to ensure the safety of individual battery cells, a pressure relief mechanism is typically installed on the casing of each cell to release internal pressure. This mechanism is activated to release pressure when the internal pressure or temperature reaches a threshold. However, existing pressure relief mechanisms may prematurely activate during use, resulting in poor stability of the battery cell and consequently hindering its lifespan and reliability. Summary of the Invention

[0006] This application provides a battery cell, a battery, and an electrical device, which can effectively improve the service life and reliability of the battery cell.

[0007] In a first aspect, embodiments of this application provide a battery cell, including a housing, an electrode assembly, a one-way valve, and a shielding member; the housing has a wall portion; the electrode assembly is housed within the housing; the one-way valve is disposed on the wall portion, the one-way valve having an outlet for discharging gas from inside the housing; the shielding member is installed on the wall portion, and along the thickness direction of the wall portion, the shielding member is located on the side of the one-way valve opposite to the electrode assembly, and the shielding member covers the one-way valve; an exhaust channel is formed between the shielding member and the wall portion, the exhaust channel connecting the outlet and the outside of the housing.

[0008] In the above technical solution, by setting a one-way valve on the wall of the outer casing, the one-way valve can open in one direction and discharge the gas inside the casing to the outside of the casing. Thus, when gas is generated inside the casing during normal use of the battery cell, it can be discharged to the outside of the casing through the one-way valve, thereby alleviating the phenomenon that the internal pressure of the battery cell will reach the threshold prematurely due to the rise in internal gas pressure. This can effectively improve the stability of the battery cell in use, thereby improving the service life and reliability of the battery cell. Furthermore, by setting a shielding component on the side of the one-way valve away from the electrode assembly, and by covering the one-way valve, the shielding component can provide a certain degree of protection and shielding for the one-way valve. On the one hand, this can reduce the wear or damage to the one-way valve in the external environment, and reduce the risk of impurities or particles in the external environment entering the one-way valve, which is beneficial to improving the service life of the one-way valve. On the other hand, covering the one-way valve with the shielding component can improve the aesthetics of the outer surface of the battery cell. Moreover, it is convenient to connect other components such as detection elements on the side of the shielding component away from the one-way valve, so as to reduce the interference of the area where the one-way valve is set on the wall on the connection of other components such as detection elements.

[0009] In some embodiments, along the thickness direction of the wall portion, the wall portion has a first surface facing away from the electrode assembly, the first surface is provided with a mounting groove, the bottom surface of the mounting groove is provided with a mounting hole, at least a portion of the one-way valve is disposed in the mounting hole, and at least a portion of the shielding member is accommodated in the mounting groove.

[0010] In the above technical solution, by setting an installation groove on the first surface of the wall away from the electrode assembly, and at least part of the shielding member is accommodated in the installation groove, on the one hand, the space occupied by the shielding member and the wall in the thickness direction of the wall can be reduced, which is beneficial to optimizing the volume of the battery cell. On the other hand, the installation groove can play a certain positioning and limiting role for the shielding member, which is beneficial to reducing the assembly difficulty of connecting the shielding member to the wall.

[0011] In some embodiments, the exhaust passage includes a first exhaust gap formed between the shield and the side of the mounting groove, the first exhaust gap being used to connect the exhaust port and the outside of the housing.

[0012] In the above technical solution, by forming a first exhaust gap between the shield and the side of the mounting groove that communicates with the outside of the housing, the gas discharged by the one-way valve can be discharged to the outside of the housing through the first exhaust gap. With this structure, the battery cell does not need to have a channel opened on the shield, which helps to reduce the processing difficulty and improves the aesthetics of the battery cell.

[0013] In some embodiments, the outer peripheral surface of the shielding member includes a first corner surface and at least two first side surfaces, the first corner surface connecting two adjacent first side surfaces; the groove side surface of the mounting groove includes a second corner surface and at least two second side surfaces, the second corner surface connecting two adjacent second side surfaces, each second side surface being connected to one first side surface, and a first exhaust gap being formed between the second corner surface and the first corner surface.

[0014] In the above technical solution, two adjacent first side surfaces on the outer periphery of the shielding member are connected by a first corner surface, and two connected second side surfaces on the side surface of the mounting groove are connected by a second corner surface. Each first side surface is connected to a second side surface, and a first gap is formed between the first corner surface and the second corner surface. That is to say, a first venting gap is formed at the corner of the shielding member and the mounting groove. On the one hand, it is convenient to form a first venting gap between the outer periphery of the shielding member and the side surface of the mounting groove, which is simple in structure and easy to implement. On the other hand, while forming a first venting gap between the outer periphery of the shielding member and the side surface of the mounting groove, it is beneficial to increase the connection area between the outer periphery of the shielding member and the side surface of the mounting groove, which is beneficial to improve the firmness of the shielding member connected to the wall.

[0015] In some embodiments, both the first corner surface and the second corner surface are arc surfaces, and the radius of the first corner surface is greater than the radius of the second corner surface.

[0016] In the above technical solution, by setting both the first corner surface and the second corner surface as arc surfaces, and the radius of the first corner surface is greater than the radius of the second corner surface, a first exhaust gap is formed between the first corner surface and the second corner surface. The structure is simple and easy to manufacture and process.

[0017] In some embodiments, the first side and the second side are welded together.

[0018] In the above technical solution, by setting the first side and the second side as a structure that is welded to each other, it is beneficial to improve the connection between the shielding member and the side of the mounting groove, thereby improving the structural stability of the shielding member assembled onto the wall.

[0019] In some embodiments, the shielding member has a rectangular cross-section in the direction perpendicular to the thickness of the wall, and the outer peripheral surface of the shielding member includes four first side surfaces and four first corner surfaces, with the first exhaust gap formed at at least one of the first corner surfaces.

[0020] In the above technical solution, by setting the shielding member as a rectangular plate structure, the four sides of the shielding member form four first side surfaces, and four first corner surfaces are formed at the four right angles of the shielding member. The structure is simple and easy to manufacture.

[0021] In some embodiments, the outer peripheral surface of the shielding member is provided with a groove, and the bottom surface of the groove and the side surface of the mounting groove form the first venting gap.

[0022] In the above technical solution, a groove is provided on the outer peripheral surface of the shielding component so that a first exhaust gap for exhaust is formed between the bottom surface of the groove and the side surface of the mounting groove. The structure is simple and easy to manufacture.

[0023] In some embodiments, the area on the outer peripheral surface of the shielding member where the groove is not provided is welded to the side surface of the mounting groove.

[0024] In the above technical solution, the area on the outer periphery of the shield without a groove is welded to the side of the mounting groove to achieve the connection of the shield to the side of the mounting groove. The battery cell with this structure is conducive to the connection between the shield and the wall, thereby improving the structural stability of the shield assembled to the wall.

[0025] In some embodiments, the outer peripheral surface of the shielding member is provided with a plurality of protrusions, the plurality of protrusions are arranged at intervals along the circumference of the shielding member, the protrusions abut against the side surface of the mounting groove, and the area of ​​the outer peripheral surface of the shielding member where the protrusions are not provided forms the first exhaust gap between the side surface of the mounting groove and the side surface of the mounting groove.

[0026] In the above technical solution, the outer peripheral surface of the shielding member is provided with a plurality of protrusions arranged at intervals along the circumference of the shielding member, and the protrusions abut against the side surface of the mounting groove, so that a first exhaust gap for exhaust is formed between the area of ​​the outer peripheral surface of the shielding member without protrusions and the side surface of the mounting groove. That is to say, the first exhaust gap is located between two adjacent protrusions, which is simple in structure and easy to assemble.

[0027] In some embodiments, the protrusion is interference-fitted with the side of the mounting groove.

[0028] In the above technical solution, the protrusion on the outer peripheral surface of the shielding member is interference-fitted with the side of the mounting groove to fix the shielding member in the mounting groove. The battery cell with this structure can form a first venting gap between two adjacent protrusions and facilitate the installation of the shielding member on the wall, which helps to reduce the assembly difficulty of the shielding member.

[0029] In some embodiments, the exhaust passage further includes a second exhaust gap, which is formed between the shield and the bottom surface of the mounting groove, and the second exhaust gap connects the first exhaust gap and the air outlet.

[0030] In the above technical solution, the exhaust channel also includes a second exhaust gap formed between the shield and the bottom surface of the mounting groove, and the second exhaust gap connects the first exhaust gap and the outlet to alleviate the phenomenon of exhaust obstruction between the outlet and the first exhaust gap caused by the shield abutting against the bottom surface of the mounting groove, thereby improving the smoothness of gas discharge from the outlet of the one-way valve to the first exhaust gap.

[0031] In some embodiments, along the thickness direction of the wall portion, the shielding member has a second surface facing the one-way valve, the second surface overlapping the bottom surface of the mounting groove, the second surface being provided with a first groove, and a second exhaust gap being formed between the bottom surface of the first groove and the bottom surface of the mounting groove.

[0032] In the above technical solution, by overlapping the second surface of the shielding member with the bottom surface of the mounting groove, the shielding member abuts against the bottom surface of the mounting groove, thereby improving the structural stability and reliability of the shielding member installed in the mounting groove. In addition, by setting a first groove on the second surface, a second exhaust gap is formed between the bottom surface of the first groove and the bottom surface of the mounting groove, so that the gas discharged from the outlet of the one-way valve can enter the first exhaust gap through the first groove and then be discharged to the outside of the housing. Thus, while the shielding member abuts against the bottom surface of the mounting groove, the first exhaust gap and the outlet can be connected through the first groove.

[0033] In some embodiments, a plurality of first exhaust gaps are formed between the shield and the side of the mounting groove, the plurality of first exhaust gaps are arranged at intervals along the circumference of the shield, and a plurality of first grooves are provided on the second surface, each of the first exhaust gaps communicating with one of the first grooves.

[0034] In the above technical solution, by forming multiple first exhaust gaps between the shield and the side of the mounting groove, and each first exhaust gap communicating with a first groove, it is beneficial to further improve exhaust efficiency.

[0035] In some embodiments, the second surface is further provided with a second groove, and a plurality of first grooves are disposed around the second groove and are all in communication with the second groove, and the second groove is in communication with the air outlet.

[0036] In the above technical solution, by setting a second groove on the second surface of the shield facing the one-way valve, the second groove is connected to the outlet of the one-way valve, and multiple first grooves are arranged around the second groove and are all connected to the second groove, so that the gas discharged from the outlet of the one-way valve can enter the second groove and then pass through the multiple first grooves and then through the corresponding first exhaust gaps to be discharged to the outside of the housing, which is beneficial to improve exhaust efficiency and can alleviate the phenomenon of gas accumulation between the shield and the one-way valve.

[0037] In some embodiments, along the thickness direction of the wall portion, the air outlet is disposed at one end of the one-way valve away from the electrode assembly, the air outlet faces the second groove, and the projection of the air outlet is located within the second groove.

[0038] In the above technical solution, by setting the outlet of the one-way valve and the second groove to face each other, and the projection of the outlet in the thickness direction of the wall is located in the second groove, the second groove is a structure that covers the outlet in the thickness direction of the wall, so that the gas discharged from the outlet of the one-way valve can directly enter the second groove, which is beneficial to improving the exhaust smoothness and exhaust efficiency.

[0039] In some embodiments, the shielding member does not extend beyond the first surface along the thickness direction of the wall portion.

[0040] In the above technical solution, by setting the shielding member to not exceed the first surface of the wall away from the electrode assembly in the thickness direction of the wall, the mounting groove can play a certain protective role for the shielding member, thereby further reducing the wear of the shielding member.

[0041] In some embodiments, the shielding member has a third surface facing away from the one-way valve, the third surface being flush with the first surface.

[0042] In the above technical solution, by setting the third surface of the shielding member away from the one-way valve and the first surface of the wall away from the electrode assembly to be flush with each other, it is beneficial to further improve the aesthetics of the outer surface of the battery cell, and it is also convenient to set information codes or connect detection elements and other components on the third surface of the shielding member.

[0043] In some embodiments, the one-way valve does not extend beyond the bottom surface of the mounting groove along the thickness direction of the wall portion.

[0044] In the above technical solution, by setting the one-way valve to not extend beyond the bottom surface of the mounting groove in the thickness direction of the wall, that is, the one-way valve set in the mounting hole does not extend into the mounting groove, the interference between the one-way valve and the shielding part set in the mounting groove can be reduced, and the one-way valve can be easily vented.

[0045] In some embodiments, the shielding member is fixedly connected to the wall portion.

[0046] In the above technical solution, by setting the shielding component to be fixedly connected to the wall, it is beneficial to reduce the risk of the shielding component detaching from the wall during use, and to improve the connection between the shielding component and the wall, so as to set information codes or connect detection elements and other components on the shielding component.

[0047] In some embodiments, the one-way valve includes a valve body, an elastic element, and a sealing element; the valve body is disposed on the wall portion, and an installation cavity is formed inside the valve body; the valve body is provided with an air inlet and an air outlet, the air inlet being used to communicate with the installation cavity and the interior of the housing, and the air outlet being used to communicate with the installation cavity and the exhaust passage; the elastic element is disposed within the installation cavity; the sealing element is movably disposed within the installation cavity, and the sealing element is used to block the air inlet under the action of the elastic element, and to open the air inlet under the action of the gas inside the housing.

[0048] In the above technical solution, the one-way valve is provided with a valve body, an elastic element, and a sealing element. The valve body is disposed on the wall and has an air inlet connecting the mounting cavity and the inside of the housing, and an air outlet connecting the mounting cavity and the exhaust channel. By placing both the elastic element and the sealing element in the mounting cavity, the elastic element can apply elastic force to the sealing element, so that the sealing element can block the air inlet to prevent gas from the outside of the housing from entering the inside of the housing. When the pressure inside the housing rises, the gas inside the housing can act on the sealing element and overcome the elastic force of the elastic element, so that the sealing element can open the air inlet. Thus, the gas inside the housing can be discharged after the one-way valve is opened in one direction, thereby realizing the one-way exhaust function of the one-way valve.

[0049] In some embodiments, the valve body includes a valve body and a valve cover; the valve body is disposed on the wall portion and has the air inlet; along the thickness direction of the wall portion, the valve cover is disposed at one end of the valve body away from the electrode assembly, the valve cover and the valve body together enclose the mounting cavity, and the valve cover has the air outlet.

[0050] In the above technical solution, the valve body of the one-way valve includes a valve body and a valve cover. By connecting the valve cover to the end of the valve body away from the electrode assembly in the thickness direction of the wall, the valve cover and the valve body jointly define the mounting cavity for accommodating the elastic element and the sealing element. The one-way valve with this structure sets the valve body into two parts, which makes it easier to assemble the elastic element and the sealing element into the mounting cavity, and helps to reduce the assembly difficulty of the one-way valve.

[0051] In some embodiments, the valve cover and the sealing member are spaced apart along the thickness direction of the wall portion, the two ends of the elastic member abut against the valve cover and the sealing member respectively, and the air inlet is disposed on the bottom surface of the mounting cavity.

[0052] In the above technical solution, by setting the valve cover and the sealing element to be arranged at intervals along the thickness direction of the wall, the two ends of the elastic element can abut against the valve cover and the sealing element respectively, so that the sealing element can block the air inlet on the bottom surface of the mounting cavity along the thickness direction of the wall under the action of the elastic element. That is, the air inlet is located at the end of the valve body facing the electrode assembly in the thickness direction of the wall. The sealing element can move along the thickness direction of the wall and block the air inlet under the action of the elastic element. The one-way valve with this structure makes it easy for the elastic element to apply elastic force to the sealing element so that the sealing element blocks the air inlet, and can reduce the assembly difficulty of the elastic element.

[0053] In some embodiments, along the thickness direction of the wall portion, the mounting cavity extends through one end of the valve body away from the electrode assembly and forms the air outlet, and the shielding member is disposed facing the air outlet.

[0054] In the above technical solution, by setting the mounting cavity to penetrate through the valve body away from the electrode assembly in the thickness direction of the wall, an air outlet is formed at the end of the valve body away from the electrode assembly, and the air outlet is covered by a shielding component. The one-way valve with this structure is easy to assemble the elastic component and the sealing component into the mounting cavity through the air inlet, which helps to reduce the assembly difficulty of the one-way valve.

[0055] In some embodiments, the shielding member and the sealing member are spaced apart along the thickness direction of the wall portion, the two ends of the elastic member abut against the shielding member and the sealing member respectively, and the air inlet is disposed on the bottom surface of the mounting cavity.

[0056] In the above technical solution, by arranging the shielding member and the sealing member at intervals along the thickness direction of the wall, the two ends of the elastic member can respectively abut against the shielding member and the sealing member. This allows the sealing member to block the air inlet on the bottom surface of the mounting cavity along the thickness direction of the wall under the action of the elastic member. In other words, the air inlet is located at the end of the valve body facing the electrode assembly in the thickness direction of the wall. The sealing member can move along the thickness direction of the wall and block the air inlet under the action of the elastic member. The one-way valve with this structure facilitates the application of elastic force by the elastic member to the sealing member, so that the sealing member blocks the air inlet, and reduces the assembly difficulty of the elastic member.

[0057] In some embodiments, the material of the shielding member is the same as the material of the wall portion.

[0058] In the above technical solution, by setting the shielding component and the wall part to be made of the same material, it is convenient to assemble the shielding component and the wall part of the same material with each other, which helps to reduce the assembly difficulty of setting the shielding component on the wall part. On the other hand, it can make the shielding component and the wall part have the same appearance, which helps to improve the aesthetics of the battery cell.

[0059] In some embodiments, the housing includes a housing and an end cap; the interior of the housing forms a receiving cavity with an opening for receiving the electrode assembly; the end cap closes the opening; wherein the end cap is the wall portion; or, the housing includes the wall portion.

[0060] In the above technical solution, by setting the wall of the outer casing as an end cap for closing the opening of the casing, the battery cell with this structure facilitates the installation of a one-way valve and a shielding component on the end cap, which helps reduce the assembly difficulty of the battery cell and improves the production efficiency of the battery cell. Similarly, by setting the wall of the outer casing as one wall of the casing, the battery cell with this structure can reduce the impact of stress generated when the end cap and the casing are connected on the one-way valve and the shielding component, thereby mitigating the phenomenon of damage to the one-way valve or failure of the shielding component connection, and thus improving the stability and service life of the battery cell.

[0061] Secondly, embodiments of this application also provide a battery, including the aforementioned battery cell.

[0062] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery cell, wherein the battery cell is used to provide electrical energy. Attached Figure Description

[0063] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0064] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0065] Figure 2 Exploded views of the battery structure provided in some embodiments of this application;

[0066] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0067] Figure 4 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0068] Figure 5 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0069] Figure 6 This is a schematic diagram of the structure of a one-way valve provided in some embodiments of this application;

[0070] Figure 7 A top view of a battery cell provided in some embodiments of this application;

[0071] Figure 8 for Figure 7 A magnified view of part A of the shown battery cell;

[0072] Figure 9 This is a schematic diagram of the structure of the shielding member provided in some embodiments of this application;

[0073] Figure 10 This is a schematic diagram of the structure of the shielding member provided in some embodiments of this application;

[0074] Figure 11 This is a schematic diagram of the structure of the shielding member provided in some embodiments of this application;

[0075] Figure 12 Bottom view of the shielding element provided in some embodiments of this application;

[0076] Figure 13 Exploded views of the structure of a one-way valve provided in some embodiments of this application;

[0077] Figure 14 A cross-sectional view of a check valve provided in some embodiments of this application;

[0078] Figure 15 A partial cross-sectional view of a battery cell provided for some embodiments of this application;

[0079] Figure 16 A partial cross-sectional view of the wall of the casing of a battery cell provided in some embodiments of this application;

[0080] Figure 17 Partial cross-sectional view of an insulating element provided in some embodiments of this application.

[0081] Icons: 1000 - Vehicle; 100 - Battery; 10 - Housing; 11 - First Housing Body; 12 - Second Housing Body; 20 - Battery Cell; 21 - Housing; 211 - Wall; 2111 - Mounting Hole; 2111a - First Hole Section; 2111b - Second Hole Section; 2112 - First Surface; 2113 - Mounting Slot; 2113a - Second Corner Surface; 2113b - Second Side Surface; 212 - Housing; 2121 - Opening; 213 - End Cap; 22 - Electrode Assembly; 221 - Electrode Lug; 23 - One-Way Valve; 231 - Air Outlet; 232 - Valve Body; 2321 - Mounting Cavity; 2322 - Air Inlet; 2323 - Valve Body; 2323a - Slot; 2323b - Connection; 2323c - Stress Relief Slot; 2324 - Valve Cover; 2324a - First... 1. Guide post; 233. Elastic element; 234. Sealing element; 2341. Second guide post; 2342. Pressing part; 2342a. Snap-fit ​​groove; 2343. Sealing part; 2343a. Snap-fit ​​part; 24. Shielding element; 241. First corner surface; 242. First side surface; 243. Groove; 244. Protrusion; 245. Second surface; 2451. First groove; 2452. Second groove; 246. Third surface; 25. Exhaust channel; 251. First exhaust gap; 252. Second exhaust gap; 26. Electrode terminal; 27. Pressure relief mechanism; 28. Insulating element; 281. Body part; 282. Receiving part; 2821. Second through hole; 2822. First wall; 2823. Second wall; 200. Controller; 300. Motor; X. Thickness direction of the wall part. Detailed Implementation

[0082] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0083] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0084] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0085] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0086] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0087] In the embodiments of this application, the same reference numerals denote 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 this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0088] In this application, "multiple" means two or more (including two).

[0089] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0090] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0091] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0092] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0093] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0094] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0095] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM)622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0096] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal may also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0097] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0098] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0099] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0100] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0101] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0102] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0103] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0104] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0105] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0106] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0107] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0108] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0109] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0110] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0111] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0112] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0113] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0114] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0115] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0116] In some implementations, the electrode assembly is a stacked structure.

[0117] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0118] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0119] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0120] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0121] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0122] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0123] In some embodiments, the electrode assembly has tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0124] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0125] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0126] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0127] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0128] In some embodiments, the battery can be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0129] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0130] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0131] Batteries possess outstanding advantages such as high energy density, low environmental pollution, high power density, long lifespan, wide applicability, and low self-discharge coefficient, making them a crucial component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as energy density, cycle life, discharge capacity, and charge / discharge rate, as well as battery safety. With the rapid development and increasing demand for batteries, the requirements for battery lifespan and reliability are also rising.

[0132] In battery technology, to ensure the safety of a typical battery cell, a pressure relief mechanism is usually installed on its casing. This mechanism releases internal pressure, effectively improving the safety of the battery cell. However, in some related technologies, a certain amount of gas is generated during battery cell operation, causing the internal pressure to rise. This can lead to premature activation of the pressure relief mechanism, resulting in poor stability and consequently, reduced lifespan and reliability of the battery cell.

[0133] Based on the above considerations, in order to solve the problems of short service life and low reliability of battery cells, this application provides a battery cell including a casing, an electrode assembly, a one-way valve, and a shielding member. The casing has a wall, the electrode assembly is housed within the casing, and the one-way valve is disposed in the wall, having an outlet for discharging gas from inside the casing. The shielding member is installed in the wall, along the thickness direction of the wall, located on the side of the one-way valve opposite to the electrode assembly, and covers the one-way valve. An exhaust channel is formed between the shielding member and the wall, connecting the outlet and the outside of the casing.

[0134] In this type of battery cell, a one-way valve is installed on the wall of the outer casing. This valve can open in one direction and discharge the gas inside the casing to the outside. When gas is generated inside the casing during normal use of the battery cell, it can be discharged to the outside through the one-way valve. This alleviates the phenomenon that the internal pressure of the battery cell will reach the threshold prematurely due to the rise in internal gas pressure, thus preventing premature actuation and depressurization. This effectively improves the stability of the battery cell and enhances its service life and reliability.

[0135] Furthermore, by setting a shielding component on the side of the one-way valve away from the electrode assembly, and by covering the one-way valve, the shielding component can provide a certain degree of protection and shielding for the one-way valve. On the one hand, this can reduce the wear or damage to the one-way valve in the external environment, and reduce the risk of impurities or particles in the external environment entering the one-way valve, which is beneficial to improving the service life of the one-way valve. On the other hand, covering the one-way valve with the shielding component can improve the aesthetics of the outer surface of the battery cell. Moreover, it is convenient to connect other components such as detection elements on the side of the shielding component away from the one-way valve, so as to reduce the interference of the area where the one-way valve is set on the wall on the connection of other components such as detection elements.

[0136] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft, and can also be used in energy storage devices. A power system comprising the battery cells and batteries disclosed in this application can be used to construct such an electrical device. This helps to mitigate the phenomenon of premature valve opening and pressure release during the use of battery cells, thereby improving the service life and reliability of the battery cells.

[0137] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0138] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0139] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0140] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0141] Please refer to Figure 2 , Figure 2 The image shows an exploded view of the structure of a battery 100 provided in some embodiments of this application. The battery 100 may include a housing 10 and battery cells 20, the battery cells 20 being housed within the housing 10.

[0142] The housing 10 provides assembly space for the battery cell 20, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cell 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 together define the assembly space; in other embodiments, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12. Of course, the housing 10 formed by the first housing body 11 and the second housing body 12 can be of various shapes, such as a cylinder or a cuboid. For example, in Figure 2 In the middle, the shape of box 10 is a cuboid.

[0143] Optionally, in the battery 100, there may be one or more battery cells 20 housed within the housing 10. When there are multiple battery cells 20 housed within the housing 10, they may be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that some of the battery cells 20 are connected in series and others in parallel. Multiple battery cells 20 may be directly connected in series, in parallel, or in a mixed configuration, and then the overall module formed by the multiple battery cells 20 is housed within the housing 10. Of course, in some embodiments, the battery 100 may also be formed by first connecting multiple battery cells 20 in series, in parallel, or in a mixed configuration to form a battery module, and then connecting multiple battery modules in series, in parallel, or in a mixed configuration to form an overall module, which is then housed within the housing 10.

[0144] In some embodiments, the battery 100 may also include other structures. For example, the battery 100 may also include a busbar component disposed within the housing 10. The busbar component connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0145] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 20 can be cylindrical, flat, cuboid, or other shapes. For example, in... Figure 2 In the middle, the battery cell 20 has a cuboid structure.

[0146] According to some embodiments of this application, refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. Figure 4 This is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application. Figure 5 This is a partial cross-sectional view of a battery cell 20 provided in some embodiments of this application. Figure 6 This is a schematic diagram of the structure of a one-way valve 23 provided in some embodiments of this application. This application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, a one-way valve 23, and a shielding member 24. The housing 21 has a wall 211, and the electrode assembly 22 is housed within the housing 21. The one-way valve 23 is disposed on the wall 211 and has an outlet 231 for discharging gas from inside the housing 21. The shielding member 24 is installed on the wall 211. Along the thickness direction X of the wall, the shielding member 24 is located on the side of the one-way valve 23 opposite to the electrode assembly 22, and covers the one-way valve 23. An exhaust passage 25 is formed between the shielding member 24 and the wall 211, and the exhaust passage 25 connects the outlet 231 and the outside of the housing 21.

[0147] The outer shell 21 can also be used to contain electrolytes, such as electrolyte solution. The outer shell 21 can have various structural forms, such as a cylinder or a cuboid. Similarly, the outer shell 21 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0148] In some embodiments, the housing 21 may include a housing 212 and an end cap 213. The housing 212 has an internal cavity for accommodating the electrode assembly 22 and has an opening 2121. That is, the housing 212 is a hollow structure with an opening 2121 at one end. The end cap 213 covers the opening 2121 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0149] It should be noted that the wall portion 211 for mounting the one-way valve 23 can be the end cap 213 of the housing 21, or it can be a wall of the housing 212 of the housing 21. For example, in... Figure 3In this embodiment, the wall portion 211 is the end cap 213. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the wall portion 211 can also be the bottom wall of the housing 212 and the end cap 213 that are disposed opposite to each other, or the wall portion 211 can also be the side wall of the housing 212 and the end cap 213 that are adjacent to each other and connected to each other.

[0150] When assembling the battery cell 20, the electrode assembly 22 can be placed into the housing 212 first, and the electrolyte can be filled into the housing 212. Then, the end cap 213 can be closed onto the opening 2121 of the housing 212 to complete the assembly of the battery cell 20.

[0151] The housing 212 can have various shapes, such as a cylinder, cuboid, or prism. The shape of the housing 212 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylinder, a cylindrical housing 212 can be used; if the electrode assembly 22 is a cuboid, a cuboid housing 212 can be used. Similarly, the end cap 213 can have various structures, such as a plate-like structure or a hollow structure open at one end. For example, in… Figure 3 In the middle, the shell 212 has a cuboid structure.

[0152] Of course, it is understandable that the outer casing 21 is not limited to the structure described above. The outer casing 21 can also be other structures. For example, the outer casing 21 can include a housing 212 and two end caps 213. The housing 212 is a hollow structure with openings 2121 on opposite sides. One end cap 213 is fitted onto one opening 2121 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte. That is, the housing 212 has openings 2121 on opposite sides, and the two end caps 213 are fitted onto the opposite sides of the housing 212 to close the corresponding openings 2121.

[0153] It should be noted that the electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction occurs. The structure of the electrode assembly 22 can be various. For example, the electrode assembly 22 can be a wound structure formed by winding the positive electrode, the separator and the negative electrode, or a stacked structure formed by arranging the positive electrode, the separator and the negative electrode in layers.

[0154] For example, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0155] Optionally, the electrode assembly 22 housed within the housing 21 can be one or more. For example, in... Figure 3In this embodiment, the outer casing 21 of the battery cell 20 is provided with two electrode assemblies 22, which are stacked along their thickness direction. That is, the two electrode assemblies 22 are stacked along the thickness direction of the battery cell 20. Of course, in other embodiments, the electrode assemblies 22 housed in the outer casing 21 may be one, three, four, five, six, seven, or eight, etc.

[0156] It should be noted that the one-way valve 23 is disposed on the wall portion 211. The one-way valve 23 is used to discharge gas inside the outer casing 21. That is, the one-way valve 23 can open in one direction to discharge gas, so that the gas inside the outer casing 21 can be discharged to the outside of the outer casing 21 through the one-way valve 23. Optionally, the structure of the one-way valve 23 disposed on the wall portion 211 can be various. It can be that the one-way valve 23 is welded to the wall portion 211, or it can be clipped to the wall portion 211, or it can be glued to the wall portion 211. Here, the outside of the outer casing 21 refers to the external environment of the battery cell 20.

[0157] For example, in Figure 5 In the middle, the wall portion 211 is provided with a mounting hole 2111, which connects the inside of the housing 21 and the outside of the housing 21. A portion of the one-way valve 23 is assembled into the mounting hole 2111 and extends into the inside of the housing 21 along the thickness direction X of the wall portion. The one-way valve 23 is sealed to the wall surface of the mounting hole 2111.

[0158] The shielding member 24 is installed on the wall portion 211 along the thickness direction X of the wall portion. The shielding member 24 is located on the side of the one-way valve 23 away from the electrode assembly 22. That is, the shielding member 24 and the one-way valve 23 are arranged along the thickness direction X of the wall portion, and the shielding member 24 is further away from the electrode assembly 22 than the one-way valve 23. Optionally, the structure of the shielding member 24 installed on the wall portion 211 can be various. For example, the shielding member 24 can be installed on the wall portion 211 by welding, interference fit, bolting, snap-fitting, or bonding.

[0159] The shielding member 24 covers the one-way valve 23, that is, the projection of the one-way valve 23 in the thickness direction X of the wall is located inside the shielding member 24.

[0160] An exhaust passage 25 is formed between the shield 24 and the wall portion 211. The exhaust passage 25 connects the air outlet 231 and the outside of the housing 21. That is, the shield 24 and the wall portion 211 together define the exhaust passage 25 that connects the air outlet 231 of the one-way valve 23 and the outside of the housing 21, so that the gas discharged from the inside of the housing 21 by the one-way valve 23 through the air outlet 231 can enter the exhaust passage 25 and then be discharged to the outside of the housing 21.

[0161] For example, the material of the shield 24 can be copper, iron, aluminum, steel or aluminum alloy, etc.

[0162] In some embodiments, the battery cell 20 may further include an electrode terminal 26, which is insulatedly mounted on the housing 21 and electrically connected to the electrode assembly 22 to output or input electrical energy to the battery cell 20.

[0163] It should be noted that the electrode terminal 26 is insulated and mounted on the housing 21, meaning that there is no electrical connection between the electrode terminal 26 and the housing 21.

[0164] Among them, Figure 3 In this design, each battery cell 20 includes two electrode terminals 26. Correspondingly, each electrode assembly 22 has two tabs 221 with opposite polarities. The two electrode terminals 26 are electrically connected to the two tabs 221 of the electrode assembly 22, respectively, to achieve the input or output of the positive and negative electrodes of the battery cell 20. It should be noted that the tabs 221 of the electrode assembly 22 are formed by stacking and connecting regions of the positive electrode sheet that are not coated with a positive active material layer, or by stacking and connecting regions of the negative electrode sheet that are not coated with a negative active material layer. If the tabs 221 are used to output the positive electrode of the electrode assembly 22, then the tabs 221 are formed by stacking and connecting regions of the positive electrode sheet that are not coated with a positive active material layer; if the tabs 221 are used to output the negative electrode of the electrode assembly 22, then the tabs 221 are formed by stacking and connecting regions of the negative electrode sheet that are not coated with a negative active material layer.

[0165] For example, the electrode terminal 26 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0166] The structure in which the electrode terminal 26 is mounted on the housing 21 can be varied; for example, in... Figure 3 In this embodiment, both electrode terminals 26 are mounted on the end cap 213 of the housing 21. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, both electrode terminals 26 may be mounted on the housing 212 of the housing 21. Similarly, one electrode terminal 26 may be mounted on the housing 212 of the housing 21, and the other electrode terminal 26 may be mounted on the end cap 213 of the housing 21.

[0167] In some embodiments, the battery cell 20 may further include a pressure relief mechanism 27, which is mounted on the housing 21. Optionally, the pressure relief mechanism 27 may be disposed on the end cap 213 of the housing 21 or on the housing 212 of the housing 21. The pressure relief mechanism 27 is used to release the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0168] For example, in Figure 3In the housing 21, the pressure relief mechanism 27 is disposed on the end cover 213 of the housing 21. The pressure relief mechanism 27 can be a pressure relief component such as an explosion-proof valve, an explosion-proof disc, a pressure relief valve or a safety valve.

[0169] By providing a one-way valve 23 on the wall 211 of the outer casing 21, the one-way valve 23 can open in one direction and discharge the gas inside the outer casing 21 to the outside of the outer casing 21. Thus, when gas is generated inside the outer casing 21 during normal use of the battery cell 20, it can be discharged to the outside of the outer casing 21 through the one-way valve 23. This alleviates the phenomenon that the internal pressure of the battery cell 20 reaches the threshold prematurely due to the rise in internal gas pressure, thereby preventing premature actuation and depressurization of the battery cell 20. This effectively improves the stability of the battery cell 20 in use, thereby increasing its service life and reliability. Furthermore, by providing a shielding member 24 on the side of the one-way valve 23 away from the electrode assembly 22, and by covering the one-way valve 23, the shielding member 24 can provide a certain degree of protection and shielding for the one-way valve 23. On the one hand, this can reduce the wear or damage to the one-way valve 23 in the external environment, and reduce the risk of impurities or particles in the external environment entering the one-way valve 23, which is beneficial to improving the service life of the one-way valve 23. On the other hand, covering the one-way valve 23 with the shielding member 24 can improve the aesthetics of the outer surface of the battery cell 20. Moreover, it is convenient to connect other components such as detection elements on the side of the shielding member 24 away from the one-way valve 23, so as to reduce the interference of the area of ​​the wall 211 where the one-way valve 23 is located on the connection of other components such as detection elements.

[0170] According to some embodiments of this application, see Figure 3 , Figure 4 and Figure 5 As shown, along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2112 facing away from the electrode assembly 22. The first surface 2112 is provided with a mounting groove 2113. The bottom surface of the mounting groove 2113 is provided with a mounting hole 2111. At least a portion of the one-way valve 23 is disposed in the mounting hole 2111, and at least a portion of the shielding member 24 is accommodated in the mounting groove 2113.

[0171] The first surface 2112 is provided with a mounting groove 2113, and the bottom surface of the mounting groove 2113 is provided with a mounting hole 2111, that is, the mounting hole 2111 penetrates the bottom surface of the mounting groove 2113, so that the mounting hole 2111 communicates with the outside of the outer shell 21 through the mounting groove 2113.

[0172] At least a portion of the shielding member 24 is accommodated within the mounting groove 2113; that is, the shielding member 24 may be entirely located within the mounting groove 2113, or it may only be partially located within the mounting groove 2113. For example, in... Figure 5 In the middle, the entire shielding component 24 is located within the mounting groove 2113.

[0173] By providing a mounting groove 2113 on the first surface 2112 of the wall portion 211 facing away from the electrode assembly 22, and at least a portion of the shielding member 24 is accommodated in the mounting groove 2113, on the one hand, the space occupied by the shielding member 24 and the wall portion 211 in the thickness direction X of the wall portion can be reduced, which is beneficial to optimizing the volume of the battery cell 20. On the other hand, the mounting groove 2113 can play a certain positioning and limiting role for the shielding member 24, which is beneficial to reducing the assembly difficulty of the shielding member 24 connected to the wall portion 211.

[0174] According to some embodiments of this application, refer to Figure 4 and Figure 5 Please refer to further details. Figure 7 and Figure 8 , Figure 7 This is a top view of a battery cell 20 provided in some embodiments of this application. Figure 8 for Figure 7 The diagram shows a partial enlarged view of point A of the battery cell 20. The venting channel 25 may include a first venting gap 251, which is formed between the shield 24 and the side of the mounting groove 2113. The first venting gap 251 is used to connect the vent 231 and the outside of the housing 21.

[0175] The first exhaust gap 251 serves to connect the exhaust port 231 and the exterior of the housing 21. The first exhaust gap 251 can be directly connected to the exhaust port 231. For example, at least a portion of the projection of the first exhaust gap 251 in the thickness direction X of the wall portion may be located within the mounting hole 2111, allowing the exhaust port 231 of the one-way valve 23 located within the mounting hole 2111 to be directly connected to the first exhaust gap 251. Alternatively, the first exhaust gap 251 can be indirectly connected to the exhaust port 231, for example, in… Figure 5 In the process, the exhaust passage 25 may also include a second exhaust gap 252, which is formed between the shield 24 and the bottom surface of the mounting groove 2113. The second exhaust gap 252 connects the first exhaust gap 251 and the outlet 231 of the one-way valve 23.

[0176] By forming a first exhaust gap 251 between the shield 24 and the side of the mounting groove 2113, which communicates with the outside of the housing 21, the gas discharged by the one-way valve 23 can be discharged to the outside of the housing 21 through the first exhaust gap 251. With this structure, the battery cell 20 does not need to have a channel opened on the shield 24, which helps to reduce the processing difficulty and improves the appearance of the battery cell 20.

[0177] It should be noted that the structure of the first venting gap 251 formed between the shield 24 and the side of the mounting groove 2113 can be varied. According to some embodiments of this application, refer to... Figure 7 and Figure 8 Please refer to further details. Figure 9 , Figure 9 This is a schematic diagram of the structure of the shielding member 24 provided in some embodiments of this application. The outer peripheral surface of the shielding member 24 includes a first corner surface 241 and at least two first side surfaces 242, wherein the first corner surface 241 connects two adjacent first side surfaces 242. The groove side surface of the mounting groove 2113 includes a second corner surface 2113a and at least two second side surfaces 2113b, wherein the second corner surface 2113a connects two adjacent second side surfaces 2113b, and each second side surface 2113b is connected to a first side surface 242, wherein a first exhaust gap 251 is formed between the second corner surface 2113a and the first corner surface 241.

[0178] The first corner surface 241 connects two adjacent first side surfaces 242. That is, in the circumferential direction of the shielding member 24, the first corner surface 241 is located between the two first side surfaces 242 and connects the two first side surfaces 242. In other words, the first corner surface 241 is the surface at the corner of the outer peripheral surface of the shielding member 24.

[0179] The second corner surface 2113a connects two adjacent second side surfaces 2113b. That is, in the circumferential direction of the mounting groove 2113, the second corner surface 2113a is located between the two second side surfaces 2113b and connects the two second side surfaces 2113b. In other words, the second corner surface 2113a is the surface at the corner of the side surface of the mounting groove 2113.

[0180] Each first side 242 of the shield 24 abuts against and connects with the corresponding second side 2113b of the groove side of the mounting groove 2113, so that the first corner surface 241 of the shield 24 faces the second corner surface 2113a of the groove side of the mounting groove 2113, thereby forming a first exhaust gap 251 between the first corner surface 241 and the second corner surface 2113a.

[0181] Optionally, the connection structure between the first side 242 and the second side 2113b can be various, such as welding, bonding or interference fit.

[0182] For example, in Figure 7 and Figure 8In the design, both the shielding member 24 and the mounting groove 2113 are rectangular structures, such that four first corner surfaces 241 are formed at the four corners of the shielding member 24, and four second corner surfaces 2113a are formed at the four corners of the side of the mounting groove 2113, so that four first exhaust gaps 251 are formed between the shielding member 24 and the side of the mounting groove 2113.

[0183] Two adjacent first side surfaces 242 on the outer peripheral surface of the shielding member 24 are connected by a first corner surface 241, and two connected second side surfaces 2113b on the groove side surface of the mounting groove 2113 are connected by a second corner surface 2113a. Each first side surface 242 is connected to a second side surface 2113b, and a first gap is formed between the first corner surface 241 and the second corner surface 2113a. That is, a first venting gap 251 is formed at the corner of the shielding member 24 and the mounting groove 2113. On the one hand, it is convenient to form a first venting gap 251 between the outer peripheral surface of the shielding member 24 and the groove side surface of the mounting groove 2113. The structure is simple and easy to implement. On the other hand, while forming a first venting gap 251 between the outer peripheral surface of the shielding member 24 and the groove side surface of the mounting groove 2113, it is beneficial to increase the connection area between the outer peripheral surface of the shielding member 24 and the groove side surface of the mounting groove 2113, which is beneficial to improve the firmness of the shielding member 24 connected to the wall portion 211.

[0184] In some embodiments, see Figure 7 , Figure 8 and Figure 9 As shown, both the first corner surface 241 and the second corner surface 2113a are arc surfaces, and the radius of the first corner surface 241 is greater than the radius of the second corner surface 2113a.

[0185] In this embodiment, both the first corner surface 241 and the second corner surface 2113a are arc surfaces. Specifically, the first corner surface 241 is the surface formed at the rounded corner of the outer peripheral surface of the shielding member 24, and similarly, the second corner surface 2113a is the surface formed at the rounded corner of the side surface of the mounting groove 2113. Of course, in other embodiments, the first corner surface 241 can also be the surface formed at the chamfer of the outer peripheral surface of the shielding member 24, and the second corner surface 2113a can also be the surface formed at the chamfer of the side surface of the mounting groove 2113.

[0186] The radius of the first corner surface 241 is greater than the radius of the second corner surface 2113a, that is, the diameter of the rounded corner of the outer peripheral surface of the shield 24 is greater than the diameter of the rounded corner of the side surface of the mounting groove 2113.

[0187] By setting both the first corner surface 241 and the second corner surface 2113a as arc surfaces, and the radius of the first corner surface 241 being greater than the radius of the second corner surface 2113a, a first exhaust gap 251 is formed between the first corner surface 241 and the second corner surface 2113a. The structure is simple and easy to manufacture and process.

[0188] In some embodiments, the first side 242 is welded to the second side 2113b.

[0189] By setting the first side 242 and the second side 2113b to be welded together, the connection between the shield 24 and the groove side of the mounting groove 2113 is improved, thereby enhancing the structural stability of the shield 24 assembled onto the wall 211.

[0190] In some embodiments, please continue to see Figure 7 , Figure 8 and Figure 9 As shown, the shielding member 24 has a rectangular cross-section in the thickness direction X perpendicular to the wall portion. The outer peripheral surface of the shielding member 24 includes four first side surfaces 242 and four first corner surfaces 241. At least one first corner surface 241 has a first exhaust gap 251 formed therein.

[0191] Among them, the cross-section of the shielding member 24 in the thickness direction X perpendicular to the wall is rectangular, that is, the shielding member 24 is a rectangular structure. Correspondingly, the shape of the mounting groove 2113 matches the shielding member 24, and the mounting groove 2113 is also a rectangular structure.

[0192] At least one first corner surface 241 is formed with a first exhaust gap 251. That is, the first exhaust gap 251 can be formed at the location of only one of the four first corner surfaces 241 of the shield 24, or it can be formed at the locations of two, three or four first corner surfaces 241.

[0193] It should be noted that in other embodiments, the cross-section of the shielding member 24 in the thickness direction X perpendicular to the wall portion can also be triangular, pentagonal, hexagonal, or trapezoidal, etc.

[0194] By setting the shielding member 24 as a rectangular plate structure, the four sides of the shielding member 24 form four first side surfaces 242, and four first corner surfaces 241 are formed at the four right angles of the shielding member 24. The structure is simple and easy to manufacture.

[0195] According to some embodiments of this application, the first venting gap 251 formed between the shield 24 and the side of the mounting groove 2113 can also be other structures, for example, referring to Figure 10 , Figure 10This is a schematic diagram of the structure of the shielding member 24 provided in some embodiments of this application. The outer peripheral surface of the shielding member 24 is provided with a groove 243, and a first venting gap 251 is formed between the bottom surface of the groove 243 and the side surface of the mounting groove 2113.

[0196] The outer peripheral surface of the shielding member 24 is used to connect with the side surface of the mounting groove 2113, so that the shielding member 24 can be installed in the mounting groove 2113. By providing a groove 243 on the outer peripheral surface of the shielding member 24, a notch is formed in the shielding member 24 at the location where the groove 243 is provided, so that the shielding member 24 at the location where the groove 243 is provided and the side surface of the mounting groove 2113 together define the first exhaust gap 251.

[0197] Optionally, the connection structure between the outer peripheral surface of the shield 24 and the side of the mounting groove 2113 can be various, such as welding or bonding.

[0198] Optionally, the number of grooves 243 provided on the outer peripheral surface of the shield 24 can be one or more. When multiple grooves 243 are provided on the outer peripheral surface of the shield 24, the multiple grooves 243 are arranged at intervals along the circumference of the shield 24.

[0199] For example, in Figure 10 In the embodiment, the shielding member 24 has a rectangular structure, and two of the four straight sides of the shielding member 24 are provided with grooves 243. Of course, in other embodiments, the number of grooves 243 provided on the outer peripheral surface of the shielding member 24 can also be three, four or five, etc. Similarly, the shape of the shielding member 24 can also be triangular, trapezoidal or circular, etc.

[0200] By providing a groove 243 on the outer peripheral surface of the shield 24, a first exhaust gap 251 for exhaust is formed between the bottom surface of the groove 243 and the side surface of the mounting groove 2113. The structure is simple and easy to manufacture.

[0201] In some embodiments, the area on the outer peripheral surface of the shielding member 24 where the groove 243 is not provided is welded to the side of the mounting groove 2113.

[0202] By welding the area on the outer periphery of the shield 24 without the groove 243 to the side of the mounting groove 2113, the shield 24 is connected to the side of the mounting groove 2113. The battery cell 20 with this structure is conducive to the connection between the shield 24 and the wall 211, thereby improving the structural stability of the shield 24 assembled on the wall 211.

[0203] According to some embodiments of this application, the first venting gap 251 formed between the shield 24 and the side of the mounting groove 2113 can also be other structures, for example, referring to Figure 11, Figure 11 This is a schematic diagram of the structure of the shielding member 24 provided in some embodiments of this application. The outer peripheral surface of the shielding member 24 is provided with a plurality of protrusions 244, which are arranged at intervals along the circumference of the shielding member 24. The protrusions 244 abut against the side surface of the mounting groove 2113. A first venting gap 251 is formed between the area of ​​the outer peripheral surface of the shielding member 24 where the protrusions 244 are not provided and the side surface of the mounting groove 2113.

[0204] The protrusion 244 abuts against the side of the mounting groove 2113, so that a cavity is formed between two adjacent protrusions 244, thereby defining the first exhaust gap 251 by the outer peripheral surface of the shield 24, the side of the mounting groove 2113, and the two adjacent protrusions 244.

[0205] Alternatively, in this embodiment, the structure in which the shielding member 24 is assembled in the mounting groove 2113 can be varied. For example, the shielding member 24 can be assembled into the mounting groove 2113 by means of interference fit between the abutting part and the side of the groove of the mounting groove 2113, welding or bonding.

[0206] The outer peripheral surface of the shield 24 is provided with a plurality of protrusions 244 arranged at intervals along the circumference of the shield 24, and the protrusions 244 abut against the side surface of the mounting groove 2113, so that a first exhaust gap 251 for exhaust is formed between the area of ​​the outer peripheral surface of the shield 24 where the protrusions 244 are not provided and the side surface of the mounting groove 2113. That is to say, the first exhaust gap 251 is located between two adjacent protrusions 244, which has a simple structure and is easy to assemble.

[0207] In some embodiments, the protrusion 244 is interference-fitted with the side of the mounting groove 2113.

[0208] By interfering with each other, the protrusion 244 on the outer peripheral surface of the shield 24 is made to fix the shield 24 in the mounting groove 2113. The battery cell 20 with this structure can form a first exhaust gap 251 between two adjacent protrusions 244 and facilitate the installation of the shield 24 on the wall 211, which helps to reduce the assembly difficulty of the shield 24.

[0209] It should be noted that in some embodiments, the first exhaust gap 251 can also be other structures. For example, a venting groove can be provided on the side of the mounting groove 2113 so that the bottom surface of the venting groove and the outer peripheral surface of the shield 24 form the first exhaust gap 251.

[0210] According to some embodiments of this application, refer to Figure 5 Please refer to further details. Figure 12 , Figure 12This is a bottom view of the shield 24 provided in some embodiments of this application. The exhaust passage 25 may also include a second exhaust gap 252, which is formed between the shield 24 and the bottom surface of the mounting groove 2113, and the second exhaust gap 252 connects the first exhaust gap 251 and the air outlet 231.

[0211] The second exhaust gap 252 is formed between the shielding member 24 and the bottom surface of the mounting groove 2113. It can be that the shielding member 24 and the bottom surface of the mounting groove 2113 are arranged at intervals along the thickness direction X of the wall, so that the second exhaust gap 252 is formed between the surface of the shielding member 24 facing the bottom surface of the mounting groove 2113 and the bottom surface of the mounting groove 2113. Alternatively, a first groove 2451 can be provided on the surface of the shielding member 24 facing the bottom surface of the mounting groove 2113, so that the second exhaust gap 252 is formed between the bottom surface of the first groove 2451 and the bottom surface of the mounting groove 2113.

[0212] It should be noted that in other embodiments, a first groove 2451 can be provided on the bottom surface of the mounting groove 2113 so that a second venting gap 252 is formed between the bottom surface of the first groove 2451 and the surface of the shield 24 facing the bottom surface of the mounting groove 2113.

[0213] The exhaust passage 25 also includes a second exhaust gap 252 formed between the shield 24 and the bottom surface of the mounting groove 2113, and the second exhaust gap 252 connects the first exhaust gap 251 and the outlet 231 to alleviate the phenomenon of exhaust obstruction between the outlet 231 and the first exhaust gap 251 caused by the shield 24 abutting against the bottom surface of the mounting groove 2113, thereby improving the smoothness of gas discharge from the outlet 231 of the one-way valve 23 to the first exhaust gap 251.

[0214] In some embodiments, please continue to see Figure 5 and Figure 12 As shown, along the thickness direction X of the wall, the shield 24 has a second surface 245 facing the one-way valve 23. The second surface 245 overlaps the bottom surface of the mounting groove 2113. The second surface 245 is provided with a first groove 2451. A second exhaust gap 252 is formed between the bottom surface of the first groove 2451 and the bottom surface of the mounting groove 2113.

[0215] The second surface 245 overlaps the bottom surface of the mounting groove 2113, that is, part of the second surface 245 abuts against the bottom surface of the mounting groove 2113. In other words, along the thickness direction X of the wall, the shielding member 24 abuts against the bottom surface of the mounting groove 2113.

[0216] A second exhaust gap 252 is formed between the bottom surface of the first groove 2451 and the bottom surface of the mounting groove 2113. That is, the bottom surface of the first groove 2451, the side surface of the first groove 2451, and the bottom surface of the mounting groove 2113 jointly define the second exhaust gap 252.

[0217] By attaching the second surface 245 of the shield 24 to the bottom surface of the mounting groove 2113, the shield 24 abuts against the bottom surface of the mounting groove 2113, thereby improving the structural stability and reliability of the shield 24 installed in the mounting groove 2113. In addition, by providing a first groove 2451 on the second surface 245, a second exhaust gap 252 is formed between the bottom surface of the first groove 2451 and the bottom surface of the mounting groove 2113. This allows the gas discharged from the outlet 231 of the one-way valve 23 to enter the first exhaust gap 251 through the first groove 2451 and then be discharged to the outside of the housing 21. Thus, while ensuring that the shield 24 abuts against the bottom surface of the mounting groove 2113, the first exhaust gap 251 and the outlet 231 can be connected through the first groove 2451.

[0218] In some embodiments, see Figure 5 , Figure 7 , Figure 8 and Figure 12 As shown, a plurality of first exhaust gaps 251 are formed between the shield 24 and the side of the mounting groove 2113. The plurality of first exhaust gaps 251 are arranged at intervals along the circumference of the shield 24. A plurality of first grooves 2451 are provided on the second surface 245. Each first exhaust gap 251 is connected to a first groove 2451.

[0219] In the embodiment where the first exhaust gap 251 is formed between the first corner surface 241 and the second corner surface 2113a, see [reference needed]. Figure 12 As shown, the first groove 2451 extends radially along the shielding member 24 and penetrates the first corner surface 241, so that the second venting gap 252 formed between the bottom surface of the first groove 2451 and the bottom surface of the mounting groove 2113 can communicate with the first venting gap 251 formed between the first corner surface 241 and the second corner surface 2113a. Of course, in the embodiment where the first venting gap 251 is formed between the bottom surface of the groove 243 of the shielding member 24 and the side surface of the mounting groove 2113, the first groove 2451 penetrates the bottom surface of the groove 243. Similarly, in the embodiment where the first venting gap 251 is formed between the area of ​​the outer peripheral surface of the shielding member 24 where the protrusion 244 is not provided and the side surface of the mounting groove 2113, the first groove 2451 penetrates the area of ​​the outer peripheral surface of the shielding member 24 where the protrusion 244 is not provided.

[0220] For example, in Figure 12In the middle, the shielding member 24 has four first corner surfaces 241, and a first exhaust gap 251 is formed at each first corner surface 241. Correspondingly, four first grooves 2451 are provided on the second surface 245 of the shielding member 24, and each first groove 2451 penetrates a first corner surface 241.

[0221] By forming a plurality of first exhaust gaps 251 between the shield 24 and the side of the mounting groove 2113, and each first exhaust gap 251 being connected to a first groove 2451, it is beneficial to further improve exhaust efficiency.

[0222] According to some embodiments of this application, see Figure 5 and Figure 12 As shown, the second surface 245 is also provided with a second groove 2452, and a plurality of first grooves 2451 are provided around the second groove 2452 and are all connected to the second groove 2452. The second groove 2452 is connected to the air outlet 231.

[0223] For example, the second surface 245 of the shield 24 is provided with four first grooves 2451. The four first grooves 2451 are arranged at intervals along the circumference of the second groove 2452. The first grooves 2451 extend radially along the shield 24 and penetrate the side of the second groove 2452, so that the first grooves 2451 can communicate with the air outlet 231 through the second groove 2452, thereby enabling the second exhaust gap 252 to communicate with the air outlet 231 through the second groove 2452.

[0224] By providing a second groove 2452 on the second surface 245 of the shield 24 facing the one-way valve 23, the second groove 2452 is connected to the outlet 231 of the one-way valve 23, and multiple first grooves 2451 are arranged around the second groove 2452 and are all connected to the second groove 2452, so that the gas discharged from the outlet 231 of the one-way valve 23 can enter the second groove 2452 and then pass through the multiple first grooves 2451 and then through the corresponding first exhaust gaps 251 to be discharged to the outside of the housing 21. This is beneficial to improve exhaust efficiency and can alleviate the phenomenon of gas accumulation between the shield 24 and the one-way valve 23.

[0225] In some embodiments, see Figure 5 As shown, along the thickness direction X of the wall, the air outlet 231 is located at the end of the one-way valve 23 away from the electrode assembly 22. The air outlet 231 faces the second groove 2452, and the projection of the air outlet 231 is located in the second groove 2452.

[0226] For example, the projection of the one-way valve 23 in the thickness direction X of the wall is entirely located within the second groove 2452.

[0227] By setting the outlet 231 and the second groove 2452 of the one-way valve 23 to face each other, and the projection of the outlet 231 in the thickness direction X of the wall is located in the second groove 2452, the second groove 2452 is a structure that covers the outlet 231 in the thickness direction X of the wall, so that the gas discharged from the outlet 231 of the one-way valve 23 can directly enter the second groove 2452, which is beneficial to improving the exhaust smoothness and exhaust efficiency.

[0228] According to some embodiments of this application, see Figure 5 As shown, along the thickness direction X of the wall, the shielding member 24 does not extend beyond the first surface 2112.

[0229] Wherein, the shielding member 24 does not extend beyond the first surface 2112, that is, the shielding member 24 does not extend into the mounting groove 2113 in the thickness direction X of the wall, so that the entire shielding member 24 is located within the mounting groove 2113.

[0230] By setting the shield 24 to not extend beyond the first surface 2112 of the wall portion 211 away from the electrode assembly 22 in the thickness direction X of the wall portion, the mounting groove 2113 can provide a certain degree of protection for the shield 24, thereby further reducing the wear of the shield 24.

[0231] In some embodiments, please continue to see Figure 5 As shown, the shield 24 has a third surface 246 that is opposite to the one-way valve 23, and the third surface 246 is flush with the first surface 2112.

[0232] By setting the third surface 246 of the shield 24 away from the one-way valve 23 and the first surface 2112 of the wall 211 away from the electrode assembly 22 to be flush with each other, it is beneficial to further improve the aesthetics of the outer surface of the battery cell 20, and it is also convenient to set information codes or connect detection elements and other components on the third surface 246 of the shield 24.

[0233] It should be noted that the information code can be a QR code, barcode, number, or text. Information about the battery cell 20 can be obtained by scanning or manually entering the information code. The detection element may include a circuit board and sampling terminals electrically connected to the circuit board. The sampling terminals may include metal sheets (such as nickel sheets), temperature sensors, etc.

[0234] According to some embodiments of this application, see Figure 5 As shown, along the thickness direction X of the wall, the one-way valve 23 does not extend beyond the bottom surface of the mounting groove 2113.

[0235] The one-way valve 23 does not extend beyond the bottom surface of the mounting groove 2113. In other words, the one-way valve 23 is located inside the mounting hole 2111 and does not extend into the mounting groove 2113 in the thickness direction X of the wall.

[0236] For example, in Figure 5 In this configuration, the end face of the one-way valve 23 facing away from the electrode assembly 22 in the thickness direction X of the wall is flush with the bottom surface of the mounting groove 2113, and the projection of the one-way valve 23 in the thickness direction X of the wall is located in the second groove 2452, so that the one-way valve 23 and the bottom surface of the second groove 2452 are arranged at intervals along the thickness direction X of the wall. The end of the one-way valve 23 facing the electrode assembly 22 in the thickness direction X of the wall protrudes from the surface of the wall 211 facing the electrode assembly 22, so that part of the one-way valve 23 extends into the housing 21.

[0237] By setting the one-way valve 23 to not extend beyond the bottom surface of the mounting groove 2113 in the thickness direction X of the wall, that is, the one-way valve 23 provided in the mounting hole 2111 does not extend into the mounting groove 2113, thereby reducing the interference between the one-way valve 23 and the shielding member 24 provided in the mounting groove 2113, and facilitating the one-way valve 23 to vent.

[0238] According to some embodiments of this application, the shielding member 24 is fixedly connected to the wall portion 211.

[0239] Alternatively, the structure for fixing the shielding member 24 to the wall portion 211 can be varied. For example, the shielding member 24 can be connected to the wall portion 211 by welding, bonding, or interference fit.

[0240] By setting the shield 24 to be fixedly connected to the wall 211, it is beneficial to reduce the risk of the shield 24 detaching from the wall 211 during use, and to improve the connection between the shield 24 and the wall 211, so as to set information codes or connect detection elements and other components on the shield 24.

[0241] According to some embodiments of this application, refer to Figure 5 and Figure 6 Please refer to further details. Figure 13 and Figure 14 , Figure 13 This is an exploded view of the structure of the one-way valve 23 provided in some embodiments of this application. Figure 14This is a cross-sectional view of a one-way valve 23 provided in some embodiments of this application. The one-way valve 23 may include a valve body 232, an elastic element 233, and a sealing element 234. The valve body 232 is disposed on the wall portion 211, and an installation cavity 2321 is formed inside the valve body 232. An air inlet 2322 and an air outlet 231 are provided on the valve body 232. The air inlet 2322 is used to connect the installation cavity 2321 and the interior of the outer casing 21, and the air outlet 231 is used to connect the installation cavity 2321 and the exhaust passage 25. The elastic element 233 is disposed within the installation cavity 2321. The sealing element 234 is movably disposed within the installation cavity 2321. The sealing element 234 is used to block the air inlet 2322 under the action of the elastic element 233, and to open the air inlet 2322 under the action of gas inside the outer casing 21.

[0242] The air inlet 2322 is used to connect the mounting cavity 2321 and the interior of the outer shell 21, that is, the gas inside the outer shell 21 can enter the mounting cavity 2321 through the air inlet 2322. Similarly, the air outlet 231 is used to connect the mounting cavity 2321 and the exhaust channel 25, that is, the gas inside the outer shell 21 that enters the mounting cavity 2321 can enter the exhaust channel 25 through the air outlet 231 and then be discharged to the outside of the outer shell 21 through the exhaust channel 25.

[0243] The sealing element 234 is movably disposed within the mounting cavity 2321, that is, the sealing element 234 can move within the mounting cavity 2321 so that the sealing element 234 can block the air inlet 2322 when it moves closer to the air inlet 2322, and conversely, the air inlet 2322 can be opened when the sealing element 234 moves away from the air inlet 2322.

[0244] The sealing element 234 is used to block the air inlet 2322 under the action of the elastic element 233, and to open the air inlet 2322 under the action of the gas inside the housing 21. That is, the elastic element 233 can provide elastic force to the sealing element 234, so that the sealing element 234 can abut against the bottom surface of the mounting cavity 2321 to block the air inlet 2322. Conversely, when the force of the gas inside the housing 21 acting on the sealing element 234 is greater than the elastic force of the elastic element 233, the gas inside the housing 21 can overcome the elastic force of the elastic element 233 and push the sealing element 234 to separate from the bottom surface of the mounting cavity 2321, so that the sealing element 234 opens the air inlet 2322, thereby allowing the gas inside the housing 21 to enter the mounting cavity 2321 through the air inlet 2322 and then be discharged through the air outlet 231.

[0245] Optionally, the elastic element 233 is a component with elasticity, and its structure can be various, such as a sheet, spring, or elastic rubber. For example, in... Figure 13 and Figure 14In this embodiment, the elastic element 233 is a spring. Of course, in other embodiments, the elastic element 233 and the sealing element 234 can also be an integral elastic component, such as elastic rubber.

[0246] It should be noted that the projection of the air outlet 231 on the thickness direction X of the wall can be located inside the spring or outside the spring. When there are multiple air outlets 231, the projections of the multiple air outlets 231 on the thickness direction X of the wall can all be located inside the spring or surround the outside of the spring. Of course, in some embodiments, they can also be partially located inside the spring and partially located outside the spring.

[0247] The one-way valve 23 includes a valve body 232, an elastic element 233, and a sealing element 234. The valve body 232 is mounted on the wall 211. The valve body 232 has an inlet 2322 connecting the mounting cavity 2321 and the interior of the outer casing 21, and an outlet 231 connecting the mounting cavity 2321 and the exhaust passage 25. By placing both the elastic element 233 and the sealing element 234 within the mounting cavity 2321, the elastic element 233 can apply an elastic force to the sealing element 234, thereby... The sealing element 234 can block the air inlet 2322 to prevent external gas from entering the interior of the housing 21. When the pressure inside the housing 21 rises, the gas inside the housing 21 can act on the sealing element 234 and overcome the elastic force of the elastic element 233, so that the sealing element 234 can open the air inlet 2322, thereby allowing the gas inside the housing 21 to be discharged after the one-way valve 23 is opened in one direction, so as to realize the one-way exhaust function of the one-way valve 23.

[0248] According to some embodiments of this application, see Figure 5 , Figure 6 , Figure 13 and Figure 14 As shown, the valve body 232 may include a valve body 2323 and a valve cover 2324. The valve body 2323 is disposed on the wall portion 211 and has an air inlet 2322. Along the thickness direction X of the wall portion, the valve cover 2324 is disposed at the end of the valve body 2323 opposite to the electrode assembly 22. The valve cover 2324 and the valve body 2323 together enclose a mounting cavity 2321, and the valve cover 2324 has an air outlet 231.

[0249] The wall portion 211 is provided with a mounting hole 2111, the valve body 2323 is installed in the mounting hole 2111, and the valve body 2323 extends into the housing 21 along the thickness direction X of the wall portion, that is, the valve body 2323 protrudes from the surface of the wall portion 211 facing the electrode assembly 22 along the thickness direction X of the wall portion.

[0250] The structure of the valve body 2323 mounted on the wall 211 can be varied. For example, the valve body 2323 can be welded to the wall of the mounting hole 2111, or it can be bonded to the wall of the mounting hole 2111 with sealant.

[0251] For example, the air inlet 2322 is located at one end of the valve body 2323 in the thickness direction X of the wall portion, near the electrode assembly 22. That is, the air inlet 2322 penetrates the bottom surface of the mounting cavity 2321. Correspondingly, the sealing member 234 is movably disposed within the mounting cavity 2321 along the thickness direction X of the wall portion, so that the sealing member 234 can seal the air inlet 2322 when it abuts against the bottom surface of the mounting cavity 2321. Of course, in other embodiments, the air inlet 2322 may also be located on one side of the valve body 2323 in the radial direction, and correspondingly, the sealing member 234 is movably disposed within the mounting cavity 2321 in the radial direction of the valve body 2323.

[0252] For example, the air outlet 231 is a first through hole provided on the valve cover 2324. The first through hole penetrates both sides of the valve cover 2324 along the thickness direction X of the wall. Figure 13 In this embodiment, the valve cover 2324 is provided with three air outlets 231, which are arranged around the central axis of the mounting hole 2111. Of course, in other embodiments, the air outlets 231 provided on the valve cover 2324 may be one, two, four, or five, etc.

[0253] As an example, there are multiple air outlets 231 provided on the valve cover 2324, and the multiple air outlets 231 are arranged at equal intervals.

[0254] As an example, multiple air outlets 231 are arranged at equal intervals around the center of the valve cover 2324, which allows the gas to flow out more smoothly.

[0255] In some embodiments, see Figure 13 and Figure 14 As shown, the valve cover 2324 is connected to the valve body 2323. A groove 2323a is provided at the end of the valve body 2323 facing away from the electrode assembly 22, and at least a portion of the valve cover 2324 is accommodated within the groove 2323a. By providing a groove 2323a at the end of the valve body 2323 facing away from the electrode assembly 22, and with at least a portion of the valve cover 2324 accommodated within the groove 2323a, the one-way valve 23 with this structure can save space occupied by the valve body 232 in the thickness direction X of the wall, improve the structural stability of the valve cover 2324 assembled on the valve body 2323, and provide some protection for the valve cover 2324, reducing wear or damage to the valve cover 2324.

[0256] The mounting cavity 2321 penetrates the bottom surface of the sink 2323a, and the valve cover 2324 is assembled in the sink 2323a and abuts against the bottom surface of the sink 2323a, so that the valve cover 2324 and the valve body 2323 enclose each other to form the mounting cavity 2321.

[0257] At least a portion of the valve cover 2324 is accommodated within the recess 2323a; that is, the valve cover 2324 may be entirely located within the recess 2323a or partially located within the recess 2323a. In other words, in the thickness direction X of the wall, the valve cover 2324 may extend beyond the recess 2323a or may not extend beyond the recess 2323a. For example, in... Figure 14 In the middle, the valve cover 2324 is located entirely within the settling tank 2323a.

[0258] For example, the valve body 2323 can be made of a metal, such as copper, iron, aluminum, steel, or aluminum alloy. Similarly, the valve cover 2324 can also be made of a metal, such as copper, iron, aluminum, steel, or aluminum alloy. The valve body 2323 and the valve cover 2324 can be made of the same material or different materials.

[0259] The valve body 232 of the one-way valve 23 includes a valve body 2323 and a valve cover 2324. By connecting the valve cover 2324 to one end of the valve body 2323 away from the electrode assembly 22 in the thickness direction X of the wall portion, the valve cover 2324 and the valve body 2323 jointly define the mounting cavity 2321 for accommodating the elastic element 233 and the sealing element 234. The one-way valve 23 with this structure sets the valve body 232 into two parts, which facilitates the assembly of the elastic element 233 and the sealing element 234 into the mounting cavity 2321, and helps to reduce the assembly difficulty of the one-way valve 23.

[0260] According to some embodiments of this application, see Figure 5 , Figure 13 and Figure 14 As shown, along the thickness direction X of the wall, the valve cover 2324 and the sealing member 234 are spaced apart, the two ends of the elastic member 233 abut against the valve cover 2324 and the sealing member 234 respectively, and the air inlet 2322 is located on the bottom surface of the mounting cavity 2321.

[0261] The valve cover 2324 and the bottom surface of the mounting cavity 2321 are arranged facing each other. The two ends of the elastic member 233 in the thickness direction X of the wall abut against the valve cover 2324 and the sealing member 234 respectively, so that the elastic member 233 is compressed between the valve cover 2324 and the sealing member 234, so that the elastic member 233 can provide elastic force to the sealing member 234, thereby enabling the sealing member 234 to block the air inlet 2322 provided on the bottom surface of the mounting cavity 2321 under the action of the elastic force of the elastic member 233.

[0262] In some embodiments, see Figure 13 and Figure 14 As shown, a first guide post 2324a protrudes from the side of the valve cover 2324 facing the sealing member 234, and part of the elastic member 233 is sleeved on the outside of the first guide post 2324a. By providing a first guide post 2324a protruding from the side of the valve cover 2324 facing the sealing member 234, and partially sleeved on the outside of the first guide post 2324a, the one-way valve 23 with this structure can, on the one hand, use the first guide post 2324a to position the elastic member 233, facilitating its assembly and reducing the assembly difficulty; on the other hand, the first guide post 2324a can guide the elastic member 233 when it is compressed along the thickness direction X of the wall, reducing radial deformation during compression. This ensures stable compression of the elastic member 233 along the thickness direction X, improving its reliability and reducing the risk of the sealing member 234 accidentally opening the air inlet 2322.

[0263] Among them, the elastic element 233 is a spring, and part of the spring is sleeved on the outside of the first guide post 2324a. The end of the spring away from the sealing element 234 abuts against the surface of the valve cover 2324 where the first guide post 2324a is protruding, that is, the first guide post 2324a is inserted into the spring.

[0264] For example, the central axis of the first guide post 2324a coincides with the central axis of the mounting hole 2111, and the central axis of the elastic member 233 coincides with the central axis of the first guide post 2324a.

[0265] It should be noted that in the embodiment where multiple air outlets 231 are provided on the valve cover 2324, the multiple air outlets 231 surround the outside of the first guide post 2324a. Of course, in other embodiments, the air outlets 231 may also be structures that penetrate the first guide post 2324a along the thickness direction X of the wall.

[0266] By setting the valve cover 2324 and the sealing member 234 to be arranged at intervals along the thickness direction X of the wall, the two ends of the elastic member 233 can respectively abut against the valve cover 2324 and the sealing member 234, so that the sealing member 234 can block the air inlet 2322 on the bottom surface of the mounting cavity 2321 along the thickness direction X of the wall under the action of the elastic member 233. That is, the air inlet 2322 is located at the end of the valve body 2323 facing the electrode assembly 22 in the thickness direction X of the wall. The sealing member 234 can move along the thickness direction X of the wall under the action of the elastic member 233 and block the air inlet 2322. The one-way valve 23 with this structure makes it easy for the elastic member 233 to apply elastic force to the sealing member 234 so that the sealing member 234 blocks the air inlet 2322, and can reduce the assembly difficulty of the elastic member 233.

[0267] According to some embodiments of this application, see Figure 14 As shown, the diameter of the first guide post 2324a is D1, and the inner diameter of the elastic element 233 is D2, satisfying that 0mm < D2 - D1 ≤ 5mm.

[0268] Among them, the elastic element 233 is a spring, and the inner diameter D2 of the elastic element 233 is the diameter of the cavity formed on the inner side of the spring.

[0269] 0mm < D2 - D1 ≤ 5mm, that is, when the first guide post 2324a and the elastic element 233 are coaxially arranged, the size of the gap between the first guide post 2324a and the elastic element 233 is greater than 0mm and less than or equal to 5mm.

[0270] For example, the difference between the inner diameter of the elastic element 233 and the diameter of the first guide post 2324a can be 0mm, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.

[0271] By setting the difference between the inner diameter of the elastic element 233 and the diameter of the first guide post 2324a to be greater than 0 mm and less than or equal to 5 mm, on the one hand, the phenomenon that the elastic element 233 is not easy to assemble on the first guide post 2324a due to the difference between the inner diameter of the elastic element 233 and the diameter of the first guide post 2324a being less than or equal to 0 can be alleviated, thereby reducing the scraping phenomenon during the process of the elastic element 233 being fitted onto the first guide post 2324a. On the other hand, the phenomenon that the gap between the elastic element 233 and the first guide post 2324a is too large due to the difference between the inner diameter of the elastic element 233 and the diameter of the first guide post 2324a being too large can be alleviated, thereby reducing the situation of radial movement or radial deformation of the elastic element 233. This can improve the balance of the elastic force of the elastic element 233 acting on the sealing element 234, thereby reducing the risk of the sealing element 234 accidentally opening the air inlet 2322.

[0272] In some embodiments, the valve cover 2324 may also be provided with a first limiting groove on the side facing the sealing member 234, and the end of the elastic member 233 away from the sealing member 234 is inserted into the first limiting groove.

[0273] In one embodiment, a first limiting groove is provided on the side of the valve cover 2324 facing the sealing member 234, that is, a first limiting groove is provided on the surface of the valve cover 2324 facing the sealing member 234 in the thickness direction X of the wall. In another embodiment, a first guide post 2324a protrudes from the side of the valve cover 2324 facing the sealing member 234, then the first limiting groove is provided on the surface of the valve cover 2324 where the first guide post 2324a protrudes.

[0274] The end of the elastic element 233 away from the sealing element 234 is inserted into the first limiting groove, that is, the end of the elastic element 233 away from the sealing element 234 abuts against the bottom surface of the first limiting groove.

[0275] For example, the elastic element 233 is a spring, and the corresponding first limiting groove is an annular groove structure. In an embodiment where the valve cover 2324 has a first guide post 2324a protruding on the side facing the sealing element 234, the first limiting groove is arranged around the outside of the first guide post 2324a.

[0276] The valve cover 2324 is also provided with a first limiting groove on the side facing the sealing member 234 for the insertion of the elastic member 233. This groove can limit the end of the elastic member 233 that abuts against the valve cover 2324, thereby reducing the phenomenon of relative radial slippage between the elastic member 233 and the valve cover 2324. This can improve the balance of the elastic force of the elastic member 233 on the sealing member 234, and help improve the reliability of the elastic member 233.

[0277] In some embodiments, the end of the elastic member 233 away from the sealing member 234 is fixedly connected to the valve cover 2324.

[0278] The structure in which the elastic element 233 is fixedly connected to the valve cover 2324 can be varied, such as welding or bonding.

[0279] It should be noted that in an embodiment where a first limiting groove is provided on the side of the valve cover 2324 facing the sealing member 234, and the end of the elastic member 233 away from the sealing member 234 is inserted into the first limiting groove, the end of the elastic member 233 away from the sealing member 234 is fixedly connected to the bottom surface of the first limiting groove; in an embodiment where a first limiting groove is not provided on the side of the valve cover 2324 facing the sealing member 234, the end of the elastic member 233 away from the sealing member 234 is fixedly connected to the surface of the valve cover 2324 that abuts against it.

[0280] By fixing the end of the elastic element 233 away from the sealing element 234 to the valve cover 2324, the end of the elastic element 233 that abuts against the valve cover 2324 is fixedly connected to the valve cover 2324. This improves the stability of the elastic element 233 against the valve cover 2324, further reduces the relative slippage between the elastic element 233 and the valve cover 2324, and further improves the balance of the elastic force exerted by the elastic element 233 on the sealing element 234.

[0281] It should be noted that the structure of the one-way valve 23 is not limited to this. In some embodiments, the one-way valve 23 can also have other structures, for example, refer to Figure 15 , Figure 15 This is a partial cross-sectional view of a battery cell 20 provided in some embodiments of this application. Along the thickness direction X of the wall, the mounting cavity 2321 penetrates the valve body 232 at one end away from the electrode assembly 22 and forms an outlet 231, with the shield 24 facing the outlet 231.

[0282] In this embodiment, the mounting cavity 2321 penetrates one end of the valve body 232 away from the electrode assembly 22 and forms an air outlet 231. That is, in the embodiment where the valve body 232 includes the valve body 2323 and the valve cover 2324, the valve body 232 is not provided with the valve cover 2324, so that the mounting cavity 2321 is formed inside the valve body 2323, and the mounting cavity 2321 penetrates one end of the valve body 2323 away from the electrode assembly 22 along the thickness direction X of the wall to form an air outlet 231.

[0283] By setting the mounting cavity 2321 to extend through the valve body 232 away from the electrode assembly 22 in the thickness direction X of the wall, an air outlet 231 is formed at the end of the valve body 232 away from the electrode assembly 22, and the air outlet 231 is covered by the shielding member 24. The one-way valve 23 with this structure is easy to assemble the elastic member 233 and the sealing member 234 into the mounting cavity 2321 through the air inlet 2322, which helps to reduce the assembly difficulty of the one-way valve 23.

[0284] It should be noted that in embodiments where the valve body 232 does not have a valve cover 2324, the air inlet 2322 can be located on the side surface of the mounting cavity 2321, meaning the sealing member 234 and the elastic member 233 are arranged radially along the mounting cavity 2321, so that the sealing member 234 can block the air inlet 2322. Alternatively, the air inlet 2322 can also be located on the bottom surface of the mounting cavity 2321, meaning the sealing member 234 and the elastic member 233 are arranged along the thickness direction X of the wall, so that the sealing member 234 can block the air inlet 2322. See also... Figure 15 As shown, along the thickness direction X of the wall, the shielding member 24 and the sealing member 234 are spaced apart, the two ends of the elastic member 233 abut against the shielding member 24 and the sealing member 234 respectively, and the air inlet 2322 is provided on the bottom surface of the mounting cavity 2321.

[0285] The shielding member 24 is disposed facing the bottom surface of the mounting cavity 2321. The two ends of the elastic member 233 in the thickness direction X of the wall abut against the shielding member 24 and the sealing member 234 respectively, so that the elastic member 233 is compressed between the shielding member 24 and the sealing member 234, so that the elastic member 233 can provide elastic force to the sealing member 234, thereby enabling the sealing member 234 to block the air inlet 2322 disposed on the bottom surface of the mounting cavity 2321 under the action of the elastic force of the elastic member 233.

[0286] It should be noted that in the embodiment where the second surface 245 of the blocking member 24 is provided with the second groove 2452, the end of the elastic member 233 away from the blocking member 234 abuts against the bottom surface of the second groove 2452.

[0287] By spaced apart along the thickness direction X of the wall, the two ends of the elastic member 233 can abut against the blocking member 24 and the sealing member 234 respectively. This allows the sealing member 234 to block the air inlet 2322 on the bottom surface of the mounting cavity 2321 along the thickness direction X of the wall under the action of the elastic member 233. In other words, the air inlet 2322 is located at the end of the valve body 2323 facing the electrode assembly 22 along the thickness direction X of the wall. The sealing member 234 can move along the thickness direction X of the wall under the action of the elastic member 233 and block the air inlet 2322. The one-way valve 23 with this structure facilitates the application of elastic force from the elastic member 233 to the sealing member 234 so that the sealing member 234 blocks the air inlet 2322, and also reduces the assembly difficulty of the elastic member 233.

[0288] In some embodiments, refer to Figure 5 , Figure 13 and Figure 14 Please refer to further details. Figure 16 , Figure 16This is a partial cross-sectional view of the wall 211 of the housing 21 of the battery cell 20 provided in some embodiments of this application. The wall 211 has a first surface 2112 facing away from the electrode assembly 22. A mounting groove 2113 is provided on the first surface 2112. A shielding member 24 is assembled into the mounting groove 2113. A mounting hole 2111 is provided on the bottom surface of the mounting groove 2113. The mounting hole 2111 communicates with the interior of the housing 21. A valve body 2323 is installed in the mounting hole 2111 and protrudes from the surface of the wall 211 facing the electrode assembly 22 along the thickness direction X of the wall. The mounting hole 2111 includes a first hole segment 2111a and a second hole segment 2111b. The first hole segment 2111a and the second hole segment 2111b are arranged along the thickness direction X of the wall, and the first hole segment 2111a is located on the side of the second hole segment 2111b away from the electrode assembly 22. The diameter of the first hole segment 2111a is larger than the diameter of the second hole segment 2111b. The valve body 2323 has a connecting portion 2323b located in the first hole segment 2111a. The connecting portion 2323b is an annular structure extending circumferentially along the valve body 2323. The connecting portion 2323b is welded to the hole wall surface of the first hole segment 2111a to form a weld mark of the annular structure.

[0289] Optionally, see Figure 14 As shown, a stress relief groove 2323c is also provided on the connecting portion 2323b, and the stress relief groove 2323c has an annular groove structure. In the embodiment where the valve body 232 includes a valve body 2323 and a valve cover 2324, the stress relief groove 2323c surrounds the outside of the valve cover 2324. In the embodiment where the valve body 232 only has a valve body 2323, the stress relief groove 2323c surrounds the outside of the mounting cavity 2321. By providing the stress relief groove 2323c on the connecting portion 2323b, the welding stress generated by the welding of the connecting portion 2323b and the hole wall of the first hole segment 2111a can be released through the stress relief groove 2323c. This reduces the impact of welding stress on the hole wall connecting the first hole segment 2111a and the weld of the connecting portion 2323b, reduces the risk of weld cracking, and thus reduces the risk of seal failure at the weld.

[0290] According to some embodiments of this application, see Figure 13 , Figure 14 and Figure 15 As shown, the sealing member 234 has a second guide post 2341 protruding on the side facing the valve cover 2324 or the shielding member 24, and part of the elastic member 233 is sleeved on the outside of the second guide post 2341.

[0291] Among them, the elastic element 233 is a spring, and part of the spring is sleeved on the outside of the second guide post 2341. The end of the spring away from the valve cover 2324 or the blocking member 24 abuts against the surface of the sealing member 234 on which the second guide post 2341 is protruding, that is, the second guide post 2341 is inserted into the spring.

[0292] For example, the central axis of the second guide post 2341 coincides with the central axis of the mounting hole 2111, and the central axis of the elastic element 233 coincides with the central axis of the second guide post 2341.

[0293] By providing a second guide post 2341 protruding from the side of the sealing member 234 facing the valve cover 2324, and partially sleeved on the outside of the second guide post 2341, the one-way valve 23 with this structure can, on the one hand, use the second guide post 2341 to position the elastic member 233, facilitating its assembly and reducing the assembly difficulty; on the other hand, the second guide post 2341 can guide the elastic member 233 when it is compressed along the thickness direction X of the wall, reducing radial deformation during compression. This ensures stable compression of the elastic member 233 along the thickness direction X, improving its reliability and reducing the risk of the sealing member 234 accidentally opening the air inlet 2322.

[0294] According to some embodiments of this application, see Figure 14 As shown, the diameter of the second guide post 2341 is D3, and the inner diameter of the elastic element 233 is D2, satisfying that 0mm < D3 - D1 ≤ 5mm.

[0295] Among them, the elastic element 233 is a spring, and the inner diameter D2 of the elastic element 233 is the diameter of the cavity formed on the inner side of the spring.

[0296] 0mm < D3 - D1 ≤ 5mm, which means that when the second guide post 2341 and the elastic element 233 are coaxially arranged, the size of the gap between the second guide post 2341 and the elastic element 233 is greater than 0mm and less than or equal to 5mm.

[0297] For example, the difference between the inner diameter of the elastic element 233 and the diameter of the guide post can be 0mm, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.

[0298] By setting the difference between the inner diameter of the elastic element 233 and the diameter of the second guide post 2341 to be greater than 0 mm and less than or equal to 5 mm, on the one hand, the phenomenon that the elastic element 233 is not easy to assemble on the second guide post 2341 due to the difference between the inner diameter of the elastic element 233 and the diameter of the second guide post 2341 being less than or equal to 0 can be alleviated, thereby reducing the scraping phenomenon during the process of the elastic element 233 being fitted on the second guide post 2341. On the other hand, the phenomenon that the gap between the elastic element 233 and the second guide post 2341 is too large due to the difference between the inner diameter of the elastic element 233 and the diameter of the second guide post 2341 being too large can be alleviated, thereby reducing the radial movement or radial deformation of the elastic element 233. This can improve the balance of the elastic force of the elastic element 233 acting on the sealing element 234, thereby reducing the risk of the sealing element 234 accidentally opening the air inlet 2322.

[0299] In some embodiments, the side of the sealing member 234 facing the valve cover 2324 may also be provided with a second limiting groove, and the end of the elastic member 233 away from the valve cover 2324 is inserted into the second limiting groove.

[0300] In one embodiment, the sealing member 234 is provided with a second limiting groove on the side facing the valve cover 2324. That is, the sealing member 234 is provided with a second limiting groove on the surface of the sealing member 234 facing the valve cover 2324 in the thickness direction X of the wall. In another embodiment, the sealing member 234 is provided with a second guide post 2341 protruding on the side facing the valve cover 2324, in which case the second limiting groove is provided on the surface of the sealing member 234 with the second guide post 2341 protruding.

[0301] The end of the elastic element 233 away from the valve cover 2324 is inserted into the second limiting groove, that is, the end of the elastic element 233 away from the valve cover 2324 abuts against the bottom surface of the second limiting groove.

[0302] For example, the elastic element 233 is a spring, and the corresponding second limiting groove is an annular groove structure. In an embodiment where the second guide post 2341 protrudes from the side of the sealing element 234 facing the valve cover 2324, the second limiting groove is arranged around the outside of the second guide post 2341.

[0303] By providing a second limiting groove for the insertion of the elastic element 233 on the side of the sealing element 234 facing the valve cover 2324, the end of the elastic element 233 that abuts against the sealing element 234 can be limited, thereby reducing the phenomenon of relative radial slippage between the elastic element 233 and the sealing element 234. This can improve the balance of the elastic force of the elastic element 233 on the sealing element 234, which is beneficial to improving the reliability of the elastic element 233.

[0304] According to some embodiments of this application, the end of the elastic member 233 away from the valve cover 2324 is fixedly connected to the sealing member 234.

[0305] The structure in which the elastic element 233 and the sealing element 234 are fixedly connected can be varied, such as by welding or bonding.

[0306] It should be noted that in an embodiment where a second limiting groove is provided on the side of the sealing member 234 facing the valve cover 2324, and the end of the elastic member 233 away from the valve cover 2324 is inserted into the second limiting groove, the end of the elastic member 233 away from the valve cover 2324 is fixedly connected to the bottom surface of the second limiting groove; in an embodiment where a second limiting groove is not provided on the side of the sealing member 234 facing the valve cover 2324, the end of the elastic member 233 away from the valve cover 2324 is fixedly connected to the surface of the sealing member 234 that abuts against it.

[0307] By fixing the end of the elastic element 233 away from the valve cover 2324 to the sealing element 234, the end of the elastic element 233 that abuts against the sealing element 234 and the sealing element 234 are fixedly connected to each other. This improves the stability of the elastic element 233 against the sealing element 234, further reduces the phenomenon of relative slippage between the elastic element 233 and the sealing element 234, and further improves the balance of the elastic force of the elastic element 233 acting on the sealing element 234.

[0308] According to some embodiments of this application, see Figure 13 , Figure 14 and Figure 15 As shown, the sealing member 234 may include a pressing part 2342 and a sealing part 2343. Along the thickness direction X of the wall, the two ends of the elastic member 233 abut against the pressing part 2342 and the valve cover 2324 or the shielding member 24, respectively. The sealing part 2343 is connected to the side of the pressing part 2342 away from the valve cover 2324 or the shielding member 24. The sealing part 2343 is used to block the air inlet 2322.

[0309] The elastic element 233 provides an elastic force to the pressing part 2342 so that the pressing part 2342 can press against the sealing part 2343, thereby sealing the air inlet 2322 through the sealing part 2343.

[0310] Optionally, the rigidity of the clamping part 2342 is greater than that of the sealing part 2343, meaning the deformation resistance of the clamping part 2342 is greater than that of the sealing part 2343. This allows the clamping part 2342 to better press the sealing part 2343 against the bottom surface of the mounting cavity 2321, thereby sealing the air inlet 2322. For example, the clamping part 2342 can be made of various materials, such as steel, iron, or aluminum. Similarly, the sealing part 2343 can also be made of various materials, such as rubber, silicone, or plastic.

[0311] Alternatively, the connection structure between the clamping part 2342 and the sealing part 2343 can be various, such as snap-fit, bolt connection or adhesive connection.

[0312] It should be noted that in the embodiment where the sealing member 234 is provided with a second guide post 2341, the second guide post 2341 protrudes from the surface of the pressing part 2342 facing the valve cover 2324 or the shielding member 24. Similarly, in the embodiment where the sealing member 234 is provided with a second limiting groove on the side facing the valve cover 2324, the second limiting groove is provided on the surface of the pressing part 2342 facing the valve cover 2324.

[0313] By configuring the sealing member 234 into two parts, namely a pressing part 2342 and a sealing part 2343, the pressing part 2342 is disposed on the side of the sealing part 2343 facing the valve cover 2324. The sealing part 2343 is used to block the air inlet 2322. The two ends of the elastic member 233 abut against the valve cover 2324 and the pressing part 2342 respectively, so that the elastic member 233 can exert elastic force on the sealing part 2343 through the pressing part 2342. This helps to improve the balance of the elastic force exerted by the elastic member 233 on the sealing part 2343, thereby effectively improving the sealing effect of the sealing part 2343 on the air inlet 2322.

[0314] According to some embodiments of this application, please continue to refer to Figure 13 , Figure 14 and Figure 15 As shown, along the thickness direction X of the wall portion, the pressing part 2342 has a snap-fit ​​groove 2342a on the side facing the sealing part 2343, and the sealing part 2343 has a snap-fit ​​part 2343a protruding on the side facing the pressing part 2342. The snap-fit ​​part 2343a is inserted into the snap-fit ​​groove 2342a, and the snap-fit ​​part 2343a and the snap-fit ​​groove 2342a are engaged. The sealing member 234 with this structure can improve the structural stability of the sealing part 2343 on the pressing part 2342, so as to reduce the phenomenon of radial slippage of the sealing part 2343 relative to the pressing part 2342, thereby improving the sealing effect of the sealing part 2343 on the air inlet 2322 and reducing the phenomenon of the air inlet 2322 being accidentally opened.

[0315] For example, the snap-fit ​​part 2343a is a circular cylindrical structure, and the corresponding snap-fit ​​groove 2342a is a circular groove.

[0316] In some embodiments, the sealing portion 2343 is bonded to the pressing portion 2342. Using an adhesive structure to connect the sealing portion 2343 and the pressing portion 2342 improves the structural stability of the connection between the sealing portion 2343 and the pressing portion 2342, reducing the risk of the sealing portion 2343 and the pressing portion 2342 detaching from each other, thus enhancing the reliability of the sealing portion 2343 in blocking the air inlet 2322. Furthermore, it facilitates the assembly connection between the sealing portion 2343 and the pressing portion 2342, reducing the assembly difficulty between them.

[0317] In some embodiments, the sealing part 2343 is made of EPDM, fluororubber, or Teflon. Using EPDM, fluororubber, or Teflon to make the sealing part 2343 provides it with good corrosion resistance, effectively mitigating the corrosion of the sealing part 2343 by the electrolyte, thereby extending its service life and reducing the likelihood of poor sealing of the air inlet 2322 due to corrosion.

[0318] It should be noted that in some embodiments, the sealing member 234 may not have a pressing part 2342, and the sealing member 234 may only include a sealing part 2343, with one end of the elastic member 233 directly abutting against the sealing part 2343.

[0319] According to some embodiments of this application, see Figure 14 As shown, along the thickness direction X of the wall, the size of the gap between the valve cover 2324 and the sealing member 234 is L, which satisfies 0mm<L≤2mm.

[0320] The gap between the valve cover 2324 and the sealing member 234 is L, that is, the distance between the valve cover 2324 and the sealing member 234 in the thickness direction X of the wall is L.

[0321] For example, the size L of the gap between the valve cover 2324 and the sealing member 234 can be 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.8mm or 2mm, etc.

[0322] It should be noted that, in the embodiment where the valve cover 2324 has a protruding first guide post 2324a and the sealing member 234 has a protruding second guide post 2341, L is the dimension of the gap formed between the first guide post 2324a and the second guide post 2341 in the thickness direction X of the wall portion; in the embodiment where the valve cover 2324 has a protruding first guide post 2324a and the sealing member 234 does not have a protruding second guide post 2341, L is the dimension of the gap formed between the first guide post 2324a and the surface of the sealing member 234 facing the valve cover 2324 in the thickness direction X of the wall portion; in the embodiment where the valve cover 2324 does not have a protruding first guide post 2324a and the sealing member 234 has a protruding second guide post 2341, L is the dimension of the gap formed between the second guide post 2341 and the surface of the valve cover 2324 facing the sealing member 234 in the thickness direction X of the wall portion.

[0323] By setting the gap between the valve cover 2324 and the sealing member 234 in the thickness direction X of the wall to be greater than 0 mm and less than or equal to 2 mm, on the one hand, the obstruction of the sealing member 234 by the valve cover 2324 can be reduced, so that there is space between the valve cover 2324 and the sealing member 234 for the sealing member 234 to move along the thickness direction X of the wall. Thus, when the gas inside the housing 21 pushes the sealing member 234, the sealing member 234 can open the air inlet 2322 to exhaust gas. On the other hand, it can alleviate the phenomenon that the one-way valve 23 occupies too much space in the thickness direction X of the wall due to the excessive gap between the valve cover 2324 and the sealing member 234, thereby improving the space utilization rate of the battery cell 20.

[0324] In some embodiments, refer to Figure 4 and Figure 5 Please refer to further details. Figure 17 , Figure 17 This is a partial cross-sectional view of the insulating member 28 provided in some embodiments of this application. The battery cell 20 may also include the insulating member 28, which is disposed on the side of the wall 211 facing the electrode assembly 22. Along the thickness direction X of the wall, the valve body 232 of the one-way valve 23 protrudes from the surface of the wall 211 facing the electrode assembly 22. The insulating member 28 includes a body portion 281 and a receiving portion 282. The body portion 281 is disposed on the side of the wall 211 facing the electrode assembly 22, and the receiving portion 282 is connected to the body portion 281. The portion of the valve body 232 of the one-way valve 23 protruding from the surface of the wall 211 facing the electrode assembly 22 is received within the receiving portion 282.

[0325] The insulating member 28 is disposed on the side of the wall portion 211 facing the electrode assembly 22. The insulating member 28 serves to separate the wall portion 211 from the electrode assembly 22, thereby insulating and isolating the wall portion 211 from the electrode assembly 22.

[0326] For example, the insulating element 28 can be made of various materials, such as rubber, silicone, or plastic.

[0327] The portion of the valve body 232 of the one-way valve 23 that protrudes from the wall portion 211 and faces the electrode assembly 22 is housed in the receiving portion 282. That is, the insulating member 28 has a receiving portion 282 formed at the position corresponding to the one-way valve 23, and the receiving portion 282 covers the outer side of the portion of the valve body 232 of the one-way valve 23 that protrudes from the wall portion 211 and faces the electrode assembly 22.

[0328] Optionally, the body portion 281 and the receiving portion 282 of the insulating member 28 can be an integral structure or a separate structure. When the body portion 281 and the receiving portion 282 are an integral structure, they can be integrally formed by processes such as injection molding or milling. When the body portion 281 and the receiving portion 282 are separate structures, the receiving portion 282 can be connected to the body portion 281 by means of bonding or snap-fitting. For example, in Figure 17 In the middle, the main body 281 and the receiving part 282 are an integral structure.

[0329] In some embodiments, see Figure 5 and Figure 17 As shown, the receiving part 282 is provided with a second through hole 2821, which is connected to the air inlet 2322 provided on the valve body 232.

[0330] The receiving part 282 is provided with a second through hole 2821, and the second through hole 2821 penetrates the receiving part 282, so that the second through hole 2821 can connect the interior of the receiving part 282 and the interior of the outer shell 21, so that the air inlet 2322 of the valve body 232 can connect to the interior of the outer shell 21 through the second through hole 2821.

[0331] By providing a second through hole 2821 on the receiving part 282, the second through hole 2821 can connect the interior of the outer shell 21 and the interior of the receiving part 282. This allows the air inlet 2322 of the valve body 232 of the one-way valve 23 to communicate with the interior of the outer shell 21 through the second through hole 2821. This enables the gas inside the outer shell 21 to enter the receiving part 282 through the second through hole 2821 and then exit the outer shell 21 through the one-way valve 23. This eliminates the need for the gas to enter the receiving part 282 through the gap between the body part 281 and the wall part 211 and then exit through the one-way valve 23, thus improving the smoothness of the one-way valve 23 in discharging the gas inside the outer shell 21.

[0332] In some embodiments, see Figure 5 and Figure 17As shown, along the thickness direction X of the wall portion, the air inlet 2322 is disposed at one end of the valve body 232 facing the electrode assembly 22. The receiving portion 282 includes a first wall 2822 and a second wall 2823. The first wall 2822 surrounds the valve body 232. Along the thickness direction X of the wall portion, one end of the first wall 2822 is connected to the body portion 281, and the second wall 2823 is connected to the end of the first wall 2822 away from the body portion 281. A second through hole 2821 is disposed in the second wall 2823.

[0333] The first wall 2822 is arranged around the valve body 232, that is, the first wall 2822 of the receiving part 282 is an annular structure arranged around the valve body 232.

[0334] One end of the first wall 2822 is connected to the main body 281, and the second wall 2823 is connected to the end of the first wall 2822 away from the main body 281. That is, the second wall 2823 is connected to the main body 281 through the first wall 2822, and the second wall 2823 and the first wall 2822 together enclose a receiving part 282 for accommodating the valve body 232. The second wall 2823 is a wall that faces the receiving part 282 and the air inlet 2322.

[0335] The second through hole 2821 is disposed on the second wall 2823, that is, the second through hole 2821 is disposed on the end of the receiving portion 282 facing the electrode assembly 22. Of course, in other embodiments, the second through hole 2821 may also be disposed on the first wall 2822, that is, the second through hole 2821 is disposed on one side of the receiving portion 282 in the radial direction.

[0336] The receiving portion 282 is provided with a first wall 2822 and a second wall 2823 that are connected to each other. The first wall 2822 surrounds the valve body 232, and the second wall 2823 is located at the end of the valve body 232 facing the electrode assembly 22 in the thickness direction X of the wall portion, so that the first wall 2822 and the second wall 2823 surround and form a receiving portion 282 for accommodating the portion of the valve body 232 that extends into the housing 21. By setting the second through hole 2821 of the receiving portion 282 on the first wall 2822, it is beneficial to increase the path of gas from the second through hole 2821 into the air inlet 2322 of the valve body 232, so as to alleviate the phenomenon of electrolyte overflow with gas. By setting the second through hole 2821 of the receiving portion 282 on the second wall 2823, it is beneficial to realize that the air inlet 2322 and the second through hole 2821 are correspondingly set, so as to improve the smoothness of the one-way valve 23 discharging gas into the housing 21.

[0337] According to some embodiments of this application, the material of the shield 24 is the same as the material of the wall portion 211.

[0338] For example, the material of the shield 24 and the material of the wall 211 can both be copper, iron, aluminum, steel or aluminum alloy, etc.

[0339] By setting the shielding member 24 and the wall portion 211 to the same material, it is convenient to assemble the shielding member 24 and the wall portion 211 of the same material together, such as by welding, which helps to reduce the assembly difficulty of setting the shielding member 24 on the wall portion 211. On the other hand, it can make the shielding member 24 and the wall portion 211 have the same appearance, which helps to improve the aesthetics of the battery cell 20.

[0340] According to some embodiments of this application, see Figure 3 and Figure 4 As shown, the housing 21 may include a housing 212 and an end cap 213. The interior of the housing 212 forms a receiving cavity with an opening 2121 for receiving the electrode assembly 22. The end cap 213 closes the opening 2121 and is a wall portion 211.

[0341] The end cap 213 is the wall portion 211, meaning that the one-way valve 23 is located on the end cap 213.

[0342] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, the housing 212 includes a wall portion 211. That is, the one-way valve 23 is installed on one wall of the housing 212. The one-way valve 23 can be installed on the bottom wall of the housing 212 opposite to the end cap 213, or it can be installed on the side wall of the housing 212 and the end cap 213 that are adjacent to each other and connected to each other.

[0343] By designating the wall portion 211 of the outer casing 21 as an end cap 213 for closing the opening 2121 of the housing 212, the battery cell 20 with this structure facilitates the installation of the one-way valve 23 on the end cap 213, reducing the assembly difficulty of the battery cell 20 and improving its production efficiency. Similarly, by designing the wall portion 211 of the outer casing 21 as a wall of the housing 212, the battery cell 20 with this structure reduces the stress generated when the end cap 213 is connected to the housing 212, thus mitigating the risk of damage to the one-way valve 23 and improving the stability and service life of the battery cell 20.

[0344] According to some embodiments of this application, see Figure 3 and Figure 4 As shown, the battery cell 20 also includes a pressure relief mechanism 27, which is disposed in the housing 21. The pressure relief mechanism 27 is configured to be actuated and release the internal pressure of the battery cell 20 in the event of thermal runaway. The actuation pressure of the pressure relief mechanism 27 is greater than the opening pressure of the one-way valve 23.

[0345] The pressure relief mechanism 27 is disposed on the outer casing 21, and can be disposed on the end cap 213 or the housing 212. For example, in Figure 4 In the middle, the pressure relief mechanism 27 is installed on the end cover 213.

[0346] The pressure relief mechanism 27 is configured to be actuated and release the internal pressure of the battery cell 20 when thermal runaway occurs. That is, when thermal runaway occurs inside the battery cell 20, the pressure relief mechanism 27 can be actuated and opened to release gases and other substances generated inside the battery cell 20 due to thermal runaway.

[0347] The actuation pressure of the pressure relief mechanism 27 is greater than the opening pressure of the one-way valve 23. In other words, the pressure at which the gas inside the casing 21 opens the pressure relief mechanism 27 is greater than the pressure at which the gas inside the casing 21 opens the one-way valve 23. It should be noted that when the battery cell 20 experiences thermal runaway, the gas inside the casing 21 of the battery cell 20 will rapidly increase to open the pressure relief mechanism 27 for pressure relief. However, during normal use, when the gas generated inside the casing 21 of the battery cell 20 reaches a threshold, it can open the one-way valve 23, but it cannot open the pressure relief mechanism 27.

[0348] Optionally, the pressure relief mechanism 27 can be integrally formed with the outer shell 21 or it can be a separate structure. If the pressure relief mechanism 27 is integrally formed with the outer shell 21, then the pressure relief mechanism 27 is located in an area of ​​the outer shell 21 with a weak structure, such as an area with a groove. If the pressure relief mechanism 27 is a separate structure from the outer shell 21, then the pressure relief mechanism 27 can be connected to the outer shell 21 by welding, hot melting, injection molding, or bonding. For example, in... Figure 4 In this structure, the pressure relief mechanism 27 and the outer shell 21 are separate components, and the pressure relief mechanism 27 is located on the end cap 213 of the outer shell 21. The pressure relief mechanism 27 can be a pressure relief component such as an explosion-proof valve, an explosion-proof disc, a pressure relief valve, or a safety valve.

[0349] For example, in Figure 4 In this embodiment, both the electrode terminal 26 and the pressure relief mechanism 27 are disposed on the end cover 213. Of course, in other embodiments, the electrode terminal 26 and the pressure relief mechanism 27 may also be disposed on different walls of the housing 21. For example, the pressure relief mechanism 27 is disposed on the housing 212, and the electrode terminal 26 is disposed on the end cover 213.

[0350] By setting the opening pressure of the one-way valve 23 to release gas to be less than the actuation pressure of the pressure relief mechanism 27, gas generated inside the casing 21 during normal use of the battery cell 20 can be discharged to the outside of the casing 21 through the one-way valve 23. This alleviates the phenomenon that the pressure relief mechanism 27 is prematurely actuated to release pressure before the battery cell 20 thermally runs away due to the rise in internal gas pressure. This effectively improves the stability of the battery cell 20 and enhances its service life and reliability.

[0351] In some embodiments, the one-way valve 23 and the pressure relief mechanism 27 may be disposed on the same wall of the housing 21. For example, both the one-way valve 23 and the pressure relief mechanism 27 may be disposed on the end cap 213.

[0352] In some embodiments, the one-way valve 23 and the pressure relief mechanism 27 may be disposed on different walls of the housing 21. For example, the one-way valve 23 may be disposed on the end cap 213, and the pressure relief mechanism 27 may be disposed on the housing 212.

[0353] In some embodiments, the exhaust rate of the one-way valve 23 is less than the exhaust rate of the pressure relief mechanism 27.

[0354] By setting the exhaust rate of the one-way valve 23 to be less than the exhaust rate of the pressure relief mechanism 27, the phenomenon that the pressure relief mechanism 27 cannot be actuated and opened due to the excessive exhaust rate of the one-way valve 23 when the battery cell 20 experiences thermal runaway can be alleviated. This allows the pressure relief mechanism 27 to be actuated and stably release the internal pressure of the battery cell 20 when the battery cell 20 experiences thermal runaway, thereby helping to reduce the risk of fire and explosion of the battery cell 20 during thermal runaway.

[0355] In some embodiments, the battery cell 20 is an alkali metal battery, such as a sodium metal battery or a lithium metal battery. The alkali metal battery, used in conjunction with the one-way valve 23, can promptly release the gas generated during normal operation, thereby improving the battery's lifespan.

[0356] According to some embodiments of this application, this application also provides a battery 100, which includes a battery cell 20 of any of the above schemes.

[0357] Among them, see Figure 2 As shown, the battery 100 may further include a housing 10, in which the battery cell 20 is housed. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which cover each other and together define an assembly space for accommodating the battery cell 20.

[0358] Optionally, in Figure 2In this embodiment, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 together define the assembly space. Of course, the structure of the box body 10 is not limited to this. In other embodiments, the first box body 11 and the second box body 12 can also both be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0359] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 2 In the middle, box 10 has a rectangular structure.

[0360] In some embodiments, the battery cell 20 disposed within the housing 10 may be one or more. For example, in... Figure 2 In this battery 100, multiple battery cells 20 are arranged inside the casing 10. These battery cells 20 can be connected in series, parallel, or in a mixed configuration. A mixed configuration means that some of the battery cells 20 are connected in series and others in parallel. The multiple battery cells 20 can be directly connected in series, parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed inside the casing 10. Alternatively, the battery 100 can also be composed of multiple battery cells 20 first connected in series, parallel, or in a mixed configuration to form a battery module, and then multiple battery modules are connected in series, parallel, or in a mixed configuration to form a whole, which is then housed inside the casing 10.

[0361] The battery 100 may also include other structures. For example, the battery 100 may also include a busbar component that connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0362] It should be noted that in some embodiments, the battery 100 may not have a housing 10. The battery 100 includes multiple battery cells 20, and the battery 100 composed of multiple battery cells 20 can be directly mounted onto an electrical device to provide power to the electrical device through the multiple battery cells 20. That is, the housing 10 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 10 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0363] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 20 of any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0364] The electrical device can be any of the aforementioned devices or systems that utilize battery cells 20.

[0365] According to some embodiments of this application, see Figures 3 to 9 And to Figures 12 to 14As shown, this application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, a one-way valve 23, and a shielding member 24. The housing 21 has a wall portion 211, and includes a shell 212 and an end cap 213. The interior of the shell 212 forms a receiving cavity with an opening 2121, in which the electrode assembly 22 is received. The end cap 213 closes the opening 2121 and is part of the wall portion 211. Along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2112 facing away from the electrode assembly 22. The first surface 2112 is provided with a mounting groove 2113, and the bottom surface of the mounting groove 2113 is provided with a mounting hole 2111. The one-way valve 23 is installed in the mounting hole 2111 and protrudes from the surface of the wall portion 211 facing the electrode assembly 22. The one-way valve 23 is used to discharge gas inside the housing 21. The one-way valve 23 includes a valve body 232, an elastic member 233, and a sealing member 234. A valve body 232 is disposed on the wall portion 211. An installation cavity 2321 is formed inside the valve body 232. An air inlet 2322 and an air outlet 231 are provided on the valve body 2322. The air inlet 2322 connects the installation cavity 2321 to the interior of the outer casing 21, and the air outlet 231 connects the installation cavity 2321 to the exhaust passage 25. An elastic element 233 is disposed within the installation cavity 2321, and a sealing element 234 is movably disposed within the installation cavity 2321. The sealing element 234 is used to seal the air inlet 2322 under the action of the elastic element 233, and to open the air inlet 2322 under the action of gas inside the outer casing 21. The valve body 232 includes a valve body 2323 and a valve cover 2324. The valve body 2323 is installed in the mounting hole 2111, and an air inlet 2322 is provided at the end of the valve body 2323 facing the electrode assembly 22. Along the thickness direction X of the wall, the valve cover 2324 is connected to the end of the valve body 2323 away from the electrode assembly 22. The valve cover 2324 and the valve body 2323 together form a mounting cavity 2321. The valve cover 2324 is provided with an air outlet 231. The valve cover 2324 and the sealing member 234 are spaced apart. The two ends of the elastic member 233 abut against the valve cover 2324 and the sealing member 234 respectively. The air inlet 2322 is located on the bottom surface of the mounting cavity 2321. The shielding member 24 is installed in the mounting groove 2113, and the material of the shielding member 24 is the same as the material of the wall 211. Along the thickness direction X of the wall portion, the shielding member 24 is located on the side of the one-way valve 23 opposite to the electrode assembly 22, and the shielding member 24 covers the one-way valve 23. An exhaust passage 25 is formed between the shielding member 24 and the wall portion 211, and the exhaust passage 25 connects the exhaust port 231 and the outside of the housing 21. The exhaust passage 25 includes a first exhaust gap 251 and a second exhaust gap 252. The first exhaust gap 251 is formed between the shielding member 24 and the side of the mounting groove 2113.The shielding member 24 and the mounting groove 2113 have rectangular cross-sections in the thickness direction X perpendicular to the wall portion. The outer peripheral surface of the shielding member 24 includes four first corner surfaces 241 and four first side surfaces 242. Each pair of adjacent first side surfaces 242 are connected by a first corner surface 241. The bottom surface of the mounting groove 2113 includes four second corner surfaces 2113a and four second side surfaces 2113b. Each pair of adjacent second side surfaces 2113b are connected by a second corner surface 2113a. Each first side surface 242 abuts against and is welded to its corresponding second side surface 2113b. A first venting gap 251 is formed between each first corner surface 241 and its corresponding second corner surface 2113a. Both the first corner surface 241 and the second corner surface 2113a are arc surfaces, and the radius of the first corner surface 241 is larger than the radius of the second corner surface 2113a. Along the thickness direction X of the wall portion, the shielding member 24 has a second surface 245 facing the one-way valve 23 and a third surface 246 facing away from the one-way valve 23. The second surface 245 overlaps the bottom surface of the mounting groove 2113, and the third surface 246 is flush with the first surface 2112. The second surface 245 is provided with four first grooves 2451, which extend radially along the shielding member 24 and penetrate a first corner surface 241. A second exhaust gap 252 is formed between the bottom surface of the first groove 2451 and the bottom surface of the mounting groove 2113. The second surface 245 is also provided with a second groove 2452, and multiple first grooves 2451 are provided around the second groove 2452 and are all connected to the second groove 2452. The second groove 2452 is connected to the air outlet 231. Along the thickness direction X of the wall portion, the air outlet 231 is provided facing the second groove 2452, and the projection of the air outlet 231 is located within the second groove 2452.

[0366] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0367] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized by, include: The outer shell has walls; Electrode assembly, housed within the housing; A one-way valve is disposed on the wall portion, the one-way valve having an outlet for discharging gas from inside the housing; as well as A shielding member is installed on the wall portion along the thickness direction of the wall portion. The shielding member is located on the side of the one-way valve away from the electrode assembly and covers the one-way valve. An exhaust channel is formed between the shielding member and the wall portion, and the exhaust channel connects the air outlet and the outside of the housing.

2. The battery cell according to claim 1, characterized in that, Along the thickness direction of the wall portion, the wall portion has a first surface facing away from the electrode assembly, the first surface is provided with a mounting groove, the bottom surface of the mounting groove is provided with a mounting hole, at least a portion of the one-way valve is disposed in the mounting hole, and at least a portion of the shielding member is accommodated in the mounting groove.

3. The battery cell according to claim 2, characterized in that, The exhaust channel includes a first exhaust gap, which is formed between the shield and the side of the mounting groove. The first exhaust gap is used to connect the air outlet and the outside of the housing.

4. The battery cell according to claim 3, characterized in that, The outer peripheral surface of the shielding member includes a first corner surface and at least two first side surfaces, wherein the first corner surface connects two adjacent first side surfaces; The mounting groove has a second corner surface and at least two second side surfaces. The second corner surface connects two adjacent second side surfaces, and each second side surface is connected to a first side surface. The first exhaust gap is formed between the second corner surface and the first corner surface.

5. The battery cell according to claim 4, characterized in that, Both the first corner surface and the second corner surface are arc surfaces, and the radius of the first corner surface is greater than the radius of the second corner surface.

6. The battery cell according to claim 4, characterized in that, The first side is welded to the second side.

7. The battery cell according to claim 4, characterized in that, The shielding member has a rectangular cross-section in the direction perpendicular to the thickness of the wall, and the outer peripheral surface of the shielding member includes four first side surfaces and four first corner surfaces, with the first exhaust gap formed at at least one of the first corner surfaces.

8. The battery cell according to claim 3, characterized in that, The outer peripheral surface of the shielding member is provided with a groove, and the bottom surface of the groove and the side surface of the mounting groove form the first exhaust gap.

9. The battery cell according to claim 8, characterized in that, The area on the outer periphery of the shielding member where the groove is not provided is welded to the side of the mounting groove.

10. The battery cell according to claim 3, characterized in that, The outer peripheral surface of the shielding member is provided with a plurality of protrusions, which are arranged at intervals along the circumference of the shielding member. The protrusions abut against the side surface of the mounting groove, and the area on the outer peripheral surface of the shielding member without the protrusions forms the first exhaust gap with the side surface of the mounting groove.

11. The battery cell according to claim 10, characterized in that, The protrusion is interference-fitted with the side of the mounting groove.

12. The battery cell according to claim 3, characterized in that, The exhaust channel further includes a second exhaust gap, which is formed between the shield and the bottom surface of the mounting groove, and the second exhaust gap connects the first exhaust gap and the air outlet.

13. The battery cell according to claim 12, characterized in that, Along the thickness direction of the wall portion, the shielding member has a second surface facing the one-way valve, the second surface overlapping the bottom surface of the mounting groove, the second surface being provided with a first groove, and a second exhaust gap being formed between the bottom surface of the first groove and the bottom surface of the mounting groove.

14. The battery cell according to claim 13, characterized in that, A plurality of first exhaust gaps are formed between the shielding member and the side of the mounting groove. The plurality of first exhaust gaps are arranged at intervals along the circumference of the shielding member. A plurality of first grooves are provided on the second surface, and each first exhaust gap communicates with a first groove.

15. The battery cell according to claim 14, characterized in that, The second surface is also provided with a second groove, and a plurality of first grooves are provided around the second groove and are all connected to the second groove. The second groove is connected to the air outlet.

16. The battery cell according to claim 15, characterized in that, Along the thickness direction of the wall portion, the air outlet is located at the end of the one-way valve away from the electrode assembly, the air outlet faces the second groove, and the projection of the air outlet is located within the second groove.

17. The battery cell according to claim 2, characterized in that, Along the thickness direction of the wall portion, the shielding member does not extend beyond the first surface.

18. The battery cell according to claim 17, characterized in that, The shielding member has a third surface that is opposite to the one-way valve, and the third surface is flush with the first surface.

19. The battery cell according to claim 2, characterized in that, Along the thickness direction of the wall portion, the one-way valve does not extend beyond the bottom surface of the mounting groove.

20. The battery cell according to claim 1, characterized in that, The shielding component is fixedly connected to the wall portion.

21. The battery cell according to any one of claims 1-20, characterized in that, The one-way valve includes: A valve body is disposed on the wall portion, and an installation cavity is formed inside the valve body. An air inlet and an air outlet are provided on the valve body. The air inlet is used to connect the installation cavity and the interior of the outer shell, and the air outlet is used to connect the installation cavity and the exhaust channel. An elastic element is disposed within the mounting cavity; A sealing element is movably disposed within the mounting cavity. The sealing element is used to block the air inlet under the action of the elastic element and to open the air inlet under the action of the gas inside the housing.

22. The battery cell according to claim 21, characterized in that, The valve body includes: A valve body is disposed on the wall portion, and the valve body is provided with the air inlet. A valve cover is disposed at one end of the valve body away from the electrode assembly along the thickness direction of the wall portion. The valve cover and the valve body together enclose the mounting cavity, and the valve cover is provided with the air outlet.

23. The battery cell according to claim 22, characterized in that, Along the thickness direction of the wall portion, the valve cover and the sealing member are spaced apart, the two ends of the elastic member abut against the valve cover and the sealing member respectively, and the air inlet is located on the bottom surface of the mounting cavity.

24. The battery cell according to claim 21, characterized in that, Along the thickness direction of the wall portion, the mounting cavity penetrates the valve body at one end away from the electrode assembly and forms the air outlet, and the shielding member is disposed facing the air outlet.

25. The battery cell according to claim 24, characterized in that, Along the thickness direction of the wall portion, the shielding member and the sealing member are spaced apart, the two ends of the elastic member abut against the shielding member and the sealing member respectively, and the air inlet is located on the bottom surface of the mounting cavity.

26. The battery cell according to any one of claims 1-20, characterized in that, The material of the shielding component is the same as the material of the wall.

27. The battery cell according to any one of claims 1-20, characterized in that, The outer casing includes: The housing has an internally formed receiving cavity with an opening for accommodating the electrode assembly; End cap, to close the opening; Wherein, the end cap is the wall portion; or The housing includes the wall portion.

28. A battery, characterized in that, Includes the battery cell as described in any one of claims 1-27.

29. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-27, the battery cell being used to provide electrical energy.

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