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 assembly and a protective patch. The shell has a wall portion, and the electrode assembly is accommodated in the shell. The one-way valve assembly is arranged on the wall portion, and the one-way valve assembly has a discharge port for discharging gas inside the shell. The protective patch is arranged on the side of the wall portion away from the electrode assembly. The protective patch is provided with an information acquisition hole penetrating through the protective patch, and the projection of the information acquisition hole in the thickness direction of the wall portion is located in the one-way valve assembly and covers the discharge port. The information acquisition hole is arranged such that the projection in the thickness direction of the wall portion is located in the one-way valve assembly and covers the discharge port, so as to hide the discharge port by the protective patch, which is beneficial to improving the appearance of the outer surface of the battery monomer, and can reduce the risk of the one-way valve assembly being blocked after impurities or particulate matters in the external environment enter the discharge port.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese patent application 2023215515062, 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 assembly, and a protective patch; the housing has a wall portion; the electrode assembly is housed within the housing; the one-way valve assembly is disposed on the wall portion and has a discharge port for discharging gas from inside the housing; the protective patch is disposed on the side of the wall portion away from the electrode assembly; wherein the protective patch has an information acquisition hole penetrating through it, the projection of the information acquisition hole in the thickness direction of the wall portion is located within the one-way valve assembly, and the protective patch covers the discharge port.

[0008] In the above technical solution, by setting a one-way valve assembly on the wall of the outer casing, the one-way valve assembly can open in one direction and discharge the gas inside the outer casing to the outside of the outer casing through the discharge port. Thus, when gas is generated inside the outer casing during normal use of the battery cell, it can be discharged to the outside of the outer casing through the one-way valve assembly, thereby alleviating the phenomenon that the internal pressure of the battery cell reaches 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. In addition, a protective patch is provided on the side of the wall facing away from the electrode assembly, which can protect the wall. By setting an information acquisition hole on the protective patch, the projection of the information acquisition hole in the thickness direction of the wall is located inside the one-way valve assembly, and the protective patch covers the exhaust port of the one-way valve assembly. This structure allows the exhaust port to be hidden by the protective patch, which helps to improve the aesthetics of the outer surface of the battery cell. On the other hand, covering the exhaust port with the protective patch can reduce the risk of impurities or particles in the external environment entering the exhaust port and causing blockage of the one-way valve assembly, which helps to improve the reliability of the battery cell. Furthermore, by setting the one-way valve assembly and the information acquisition hole of the protective patch to correspond, the area where the battery cell exhausts through the one-way valve assembly corresponds to the area where the information acquisition hole of the protective patch is set, which can save the space occupied by the information acquisition hole and the one-way valve assembly on the outer surface of the casing, which helps to improve the integration of the battery cell.

[0009] In some embodiments, the one-way valve assembly forms an exposed surface corresponding to the position of the information acquisition hole, and the exposed surface is a plane.

[0010] In the above technical solution, by setting the exposed surface of the information acquisition hole corresponding to the one-way valve assembly as a plane, it is possible to set information codes or connect components such as detection elements for sampling on the exposed surface of the planar structure, and further improve the aesthetics of the outer surface of the battery cell.

[0011] 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 being flush with the exposed surface.

[0012] In the above technical solution, by setting the exposed surface formed by the information acquisition hole corresponding to the one-way valve assembly 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 on the other hand, it is convenient to set the protective patch on the side of the wall away from the electrode assembly, which helps to reduce the difficulty of assembling the protective patch on the wall and reduce the interference of the one-way valve assembly on the protective patch.

[0013] In some embodiments, the one-way valve assembly forms an exposed surface corresponding to the location of the information acquisition hole. The one-way valve assembly includes a one-way valve and a shielding member. The one-way valve is mounted on the wall portion and has an outlet for discharging gas from inside the housing. The shielding member is connected to the wall portion and, along the thickness direction of the wall portion, is located at the end of the one-way valve opposite to the electrode assembly. The shielding member covers the one-way valve and has a second surface opposite to the one-way valve, the second surface including the exposed surface. An exhaust channel is formed between the shielding member and the wall portion, the exhaust channel communicating with the outlet, and one end of the exhaust channel forming a discharge port communicating with the outside of the housing.

[0014] In the above technical solution, the one-way valve assembly is provided with a one-way valve and a shielding member. The one-way valve is used to discharge the gas inside the housing through the vent. By setting the shielding member at the end of the one-way valve away from the electrode assembly and covering the one-way valve, an exposed surface is formed on the second surface of the shielding member away from the one-way valve. This allows the projection of the information acquisition hole of the protective patch in the thickness direction of the wall to be located within the second surface. The one-way valve assembly with this structure facilitates the corresponding setting of the information acquisition hole through the shielding member to form an exposed surface on the shielding member. This allows information codes or components such as detection elements for sampling to be set on the shielding member, which helps to reduce the damage or pulling caused to the one-way valve by the information codes or detection elements. On the other hand, by covering the one-way valve with the shielding member, it is easier to form an exposed surface on the shielding member, which helps to reduce the difficulty of forming the exposed surface.

[0015] 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.

[0016] 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.

[0017] In some embodiments, the exhaust passage includes a first exhaust gap formed between the shield and the sidewall of the mounting groove, wherein the exhaust gap forms the discharge port at the end of the wall portion away from the electrode assembly in the thickness direction.

[0018] In the above technical solution, by forming a first exhaust gap that communicates with the outside of the housing between the shield and the side of the mounting groove, and forming an exhaust port at the end of the first exhaust gap away from the electrode assembly in the thickness direction of the wall, 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, improves the appearance of the battery cell, and facilitates the protective patch to cover the exhaust port.

[0019] In some embodiments, 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.

[0020] 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 air outlet to alleviate the phenomenon of exhaust obstruction between the air 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 air outlet of the one-way valve to the first exhaust gap.

[0021] In some embodiments, the shielding member does not extend beyond the first surface along the thickness direction of the wall portion.

[0022] 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.

[0023] In some embodiments, the first surface is flush with the second surface.

[0024] In the above technical solution, by setting the second 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, on the one hand, it is beneficial to further improve the aesthetics of the outer surface of the battery cell and facilitate the formation of an exposed surface on the second surface of the shielding member. On the other hand, it is convenient to set the protective patch on the side of the wall away from the electrode assembly, which helps to reduce the difficulty of assembling the protective patch on the wall.

[0025] In some embodiments, the one-way valve includes a valve body, an elastic element, and a sealing element; the valve body is mounted on the wall, 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 communicating with the installation cavity and the interior of the housing, and the air outlet communicating 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 gas inside the housing.

[0026] In the above technical solution, the one-way valve includes 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 interior of the housing, as well as 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 interior 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.

[0027] In some embodiments, the valve body includes a valve body and a valve cover; the valve body is mounted on the wall portion, and the valve body has an air inlet at one end of the wall portion near the electrode assembly in the thickness direction; along the thickness direction of the wall portion, the valve cover is connected to the end of the valve body opposite to the electrode assembly, the valve cover and the valve body together form the mounting cavity, 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 valve cover has an air outlet.

[0028] 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 facing away from the electrode assembly in the thickness direction of the wall portion, the valve cover and the valve body together define an installation cavity for accommodating the elastic element and the sealing element. This structure of the one-way valve divides the valve body into two parts, facilitating the assembly of the elastic element and the sealing element into the installation cavity and reducing the assembly difficulty of the one-way valve. Furthermore, by arranging the valve cover and the sealing element at intervals along the thickness direction of the wall portion, the two ends of the elastic element can respectively abut against the valve cover and the sealing element. This allows the sealing element to block the air inlet at the end of the valve body facing the electrode assembly in the thickness direction of the wall portion under the action of the elastic element. This structure of the one-way valve facilitates the application of elastic force by the elastic element to the sealing element, causing the sealing element to block the air inlet, and also reduces the assembly difficulty of the elastic element.

[0029] In some embodiments, the one-way valve assembly forms an exposed surface corresponding to the location of the information acquisition hole. The one-way valve assembly includes a one-way valve, which is mounted on the wall and has the discharge port. The exposed surface is formed at the end of the one-way valve opposite to the electrode assembly along the thickness direction of the wall.

[0030] In the above technical solution, the one-way valve assembly is equipped with a one-way valve, and the one-way valve has a discharge port, which allows the one-way valve to directly discharge the gas inside the shell through the discharge port. By forming an exposed surface at the end of the one-way valve away from the electrode assembly, the projection of the information acquisition hole of the protective patch in the thickness direction of the wall falls directly into the one-way valve. This makes the one-way valve a structure that corresponds to the information acquisition hole in the thickness direction of the wall. As a result, information codes or components such as detection elements for sampling can be directly set in the area of ​​the one-way valve corresponding to the information acquisition hole. The structure is simple and easy to assemble, which helps to reduce the assembly difficulty of the battery cell.

[0031] In some embodiments, the one-way valve includes a valve body, an elastic element, and a sealing element; the valve body is mounted 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 exhaust port, the air inlet communicating with the interior of the installation cavity and the interior of the housing, and the exhaust port communicating with the exterior of the installation cavity and the exterior of the housing; 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 gas inside the housing; wherein, along the thickness direction of the wall portion, the end of the valve body opposite to the electrode assembly has the exposed surface.

[0032] In the above technical solution, the one-way valve includes 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 interior of the outer shell, and an exhaust port connecting the exterior of the outer shell. By placing both the elastic element and the sealing element within the mounting cavity, the elastic element can apply an elastic force to the sealing element, enabling the sealing element to block the air inlet and prevent external gas from entering the interior of the outer shell. When the pressure inside the outer shell rises, the gas inside the outer shell can act on the sealing element and overcome the elastic force of the elastic element, allowing the sealing element to open the air inlet. This allows the gas inside the outer shell to be discharged through the one-way valve, achieving the one-way exhaust function of the one-way valve. Furthermore, by forming an exposed surface at the end of the valve body facing away from the electrode assembly in the thickness direction of the wall, the projection of the information acquisition hole in the thickness direction of the wall directly falls onto the valve body, resulting in a simple structure that is easy to implement.

[0033] In some embodiments, the valve body includes a valve body and a valve cover; the valve body is mounted on the wall portion, and the valve body has an air inlet at one end of the wall portion near the electrode assembly in the thickness direction; along the thickness direction of the wall portion, the valve cover is connected to the end of the valve body away from the electrode assembly, the valve cover has a third surface away from the electrode assembly, the third surface includes the exposed surface, the valve cover and the valve body together enclose the mounting cavity, the valve cover and the sealing member are spaced apart, and the two ends of the elastic member abut against the valve cover and the sealing member respectively; wherein, the valve cover has an air outlet, the air outlet communicates with the mounting cavity, and one end of the air outlet through the third surface forms the discharge port; or, a third exhaust gap is formed between the valve cover and the valve body, the third exhaust gap communicates with the mounting cavity, and the end of the third exhaust gap away from the electrode assembly in the thickness direction of the wall portion forms the discharge port.

[0034] In the above technical solution, the valve body 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, an exposed surface is formed on the third surface of the valve cover away from the electrode assembly. This means the projection of the information acquisition hole in the thickness direction of the wall lies within the third surface, facilitating the formation of this exposed surface on the valve body and reducing the difficulty of creating it. Furthermore, by providing an vent hole on the valve cover, with the vent hole penetrating the third surface of the valve cover to form a discharge port, the valve body with this structure reduces the interference caused by the vent hole on the connection between the valve cover and the valve body, thus reducing the assembly difficulty of the valve cover and valve body. Similarly, by providing a third exhaust gap between the valve cover and the valve body, with the end of the third exhaust gap away from the electrode assembly in the thickness direction of the wall forming a discharge port, the valve body with this structure facilitates the use of a protective patch to cover the discharge port, reducing the difficulty of covering the discharge port with the protective patch.

[0035] In some embodiments, along the thickness direction of the wall portion, the wall portion has a first surface facing away from the electrode assembly, and the wall portion is provided with a mounting hole that penetrates the first surface, and at least a portion of the valve body is mounted in the mounting hole; wherein, the third surface is flush with the first surface.

[0036] In the above technical solution, by setting the third surface of the valve cover away from the electrode assembly and the first surface of the wall away from the electrode assembly to be flush with each other, on the one hand, it is beneficial to further improve the aesthetics of the outer surface of the battery cell and facilitate the formation of an exposed surface on the third surface of the valve cover. On the other hand, it is convenient to set the protective patch on the side of the wall away from the electrode assembly, which helps to reduce the difficulty of assembling the protective patch on the wall.

[0037] In some embodiments, the valve body does not extend beyond the first surface along the thickness direction of the wall portion.

[0038] In the above technical solution, by setting the valve body to not extend beyond the first surface of the wall away from the electrode assembly, the phenomenon of the valve body protruding from the first surface of the wall is alleviated. On the one hand, it is beneficial to improve the aesthetics of the outer surface of the battery cell, and on the other hand, it can reduce the interference effect of the valve body on the protective patch, thereby reducing the difficulty of assembling the protective patch on the wall.

[0039] In some embodiments, an adhesive layer is provided on the side of the protective patch facing the wall portion, and the adhesive layer adheres the protective patch and the wall portion; wherein, the adhesive layer is provided with a first clearance hole corresponding to the position of the information acquisition hole, and along the thickness direction of the wall portion, the projections of the information acquisition hole and the discharge port are both located within the first clearance hole.

[0040] In the above technical solution, by providing an adhesive layer on the side of the protective patch facing the wall, the protective patch can be adhered to the wall through the adhesive layer, which helps to reduce the assembly difficulty of the protective patch and improve the connection stability of the protective patch on the wall. Furthermore, by providing a first clearance hole at the position of the adhesive layer corresponding to the information acquisition hole, and ensuring that the projections of the information acquisition hole of the protective patch and the discharge port of the one-way valve assembly in the thickness direction of the wall are both located within the first clearance hole, the obstruction of the discharge port by the adhesive layer is reduced. This allows the gas discharged through the discharge port of the one-way valve assembly to enter the information acquisition hole through the gap between the protective patch and the wall before being discharged, thereby achieving adhesion of the protective patch to the wall while reducing the impact on the venting of the one-way valve assembly.

[0041] 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.

[0042] 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 assembly 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 a 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 assembly, thereby mitigating damage or connection failure of the one-way valve assembly and improving the stability and service life of the battery cell.

[0043] Secondly, embodiments of this application also provide a battery, including the aforementioned battery cell.

[0044] 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

[0045] 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.

[0046] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0047] Figure 2 Exploded views of the battery structure provided in some embodiments of this application;

[0048] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0049] Figure 4 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0050] Figure 5 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0051] Figure 6 This is a schematic diagram illustrating the assembly of the protective patch and shielding component for a battery cell according to some embodiments of this application;

[0052] Figure 7 A top view of a battery cell (after removing the protective patch) provided in some embodiments of this application;

[0053] Figure 8 for Figure 7 A magnified view of part A of the shown battery cell;

[0054] Figure 9 A schematic diagram of the structure of the shielding member of the one-way valve assembly of a battery cell provided in some embodiments of this application;

[0055] Figure 10 A bottom view of the shielding member of the one-way valve assembly of a battery cell provided in some embodiments of this application;

[0056] Figure 11 A schematic diagram of the structure of the one-way valve of the one-way valve assembly of a battery cell provided in some embodiments of this application;

[0057] Figure 12 An exploded view of the structure of the one-way valve of the one-way valve assembly of a battery cell provided in some embodiments of this application;

[0058] Figure 13 A cross-sectional view of the one-way valve of the one-way valve assembly of a battery cell provided in some embodiments of this application;

[0059] Figure 14 A partial cross-sectional view of a battery cell provided for some embodiments of this application;

[0060] Figure 15 Partial cross-sectional view of an insulating element provided in some embodiments of this application;

[0061] Figure 16 This is a schematic diagram illustrating the connection between the protective patch and the adhesive layer provided in some embodiments of this application.

[0062] Icons: 1000 - Vehicle; 100 - Battery; 10 - Housing; 101 - First Housing Body; 102 - Second Housing Body; 20 - Battery Cell; 1 - Shell; 11 - Wall; 111 - Mounting Hole; 1111 - First Hole Section; 1112 - Second Hole Section; 112 - First Surface; 113 - Mounting Slot; 1131 - Second Corner Surface; 1132 - Second Side Surface; 12 - Housing; 121 - Opening; 13 - 1-End cap; 2-Electrode assembly; 21-Electrode tab; 3-One-way valve assembly; 31-Discharge port; 32-Exposed surface; 33-One-way valve; 331-Air outlet; 332-Valve body; 3321-Mounting cavity; 3322-Air inlet; 3323-Valve body; 3323a-Sink; 3323b-Connection; 3323c-Stress relief groove; 3324-Valve cover; 3324a-First guide post; 3324b-Second guide post Three surfaces; 333-Elastic element; 334-Sealing element; 3341-Second guide post; 3342-Clamping part; 3342a-Snap-fit ​​groove; 3343-Sealing part; 3343a-Snap-fit ​​part; 34-Shielding element; 341-Second surface; 342-First corner surface; 343-First side surface; 344-Fourth surface; 3441-First groove; 3442-Second groove; 35-Exhaust channel; 351-First row 352 - Second exhaust gap; 4 - Protective patch; 41 - Information acquisition hole; 42 - Second clearance hole; 43 - Third clearance hole; 5 - Electrode terminal; 6 - Pressure relief mechanism; 7 - Insulating component; 71 - Body part; 72 - Receiving part; 721 - Through hole; 722 - First wall; 723 - Second wall; 8 - Adhesive layer; 81 - First clearance hole; 200 - Controller; 300 - Motor; X - Thickness direction of the wall part. Detailed Implementation

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] 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.

[0069] In this application, "multiple" means two or more (including two).

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] 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.).

[0076] 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.

[0077] 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.

[0078] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0079] 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.).

[0080] 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.

[0081] 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.

[0082] 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.

[0083] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0084] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0092] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0093] 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.

[0094] 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.

[0095] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0096] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0097] In some implementations, the electrode assembly is a stacked structure.

[0098] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0099] 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.

[0100] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0101] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0102] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0103] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0104] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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.

[0109] 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.

[0110] 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.

[0111] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0112] 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.

[0113] 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.

[0114] 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 assembly, and a protective patch. The casing has a wall, and the electrode assembly is housed within the casing. The one-way valve assembly is disposed in the wall and has a vent for discharging gas from inside the casing. The protective patch is disposed on the side of the wall opposite to the electrode assembly. The protective patch has a through-hole for collecting information, and the projection of the through-hole onto the thickness of the wall is located within the one-way valve assembly. The protective patch covers the vent.

[0115] In this type of battery cell, a one-way valve assembly is installed on the wall of the outer casing. This assembly can open in one direction and discharge the gas inside the casing to the outside through the exhaust port. This allows the gas generated inside the casing during normal use of the battery cell to be discharged to the outside through the one-way valve assembly. This mitigates the phenomenon where the internal pressure of the battery cell reaches the threshold prematurely due to the rise in internal gas pressure, thus preventing premature actuation and depressurization. In this way, the stability of the battery cell in use can be effectively improved, thereby increasing the service life and reliability of the battery cell.

[0116] In addition, a protective patch is provided on the side of the wall facing away from the electrode assembly, which can protect the wall. By setting an information acquisition hole on the protective patch, the projection of the information acquisition hole in the thickness direction of the wall is located inside the one-way valve assembly, and the protective patch covers the exhaust port of the one-way valve assembly. This structure allows the exhaust port to be hidden by the protective patch, which helps to improve the aesthetics of the outer surface of the battery cell. On the other hand, covering the exhaust port with the protective patch can reduce the risk of impurities or particles in the external environment entering the exhaust port and causing blockage of the one-way valve assembly, which helps to improve the reliability of the battery cell. Furthermore, by setting the one-way valve assembly and the information acquisition hole of the protective patch to correspond, the area where the battery cell exhausts through the one-way valve assembly corresponds to the area where the information acquisition hole of the protective patch is set, which can save the space occupied by the information acquisition hole and the one-way valve assembly on the outer surface of the casing, which helps to improve the integration of the battery cell.

[0117] 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.

[0118] 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.

[0119] 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.

[0120] 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.

[0121] 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.

[0122] 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.

[0123] 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 101 and a second housing body 102, which overlap each other, and together define an assembly space for accommodating the battery cell 20. The second housing body 102 may be a hollow structure open at one end, and the first housing body 101 may be a plate-like structure, with the first housing body 101 covering the open side of the second housing body 102, so that the first housing body 101 and the second housing body 102 together define the assembly space; in other embodiments, the first housing body 101 and the second housing body 102 may both be hollow structures open on one side, with the open side of the first housing body 101 covering the open side of the second housing body 102. Of course, the housing 10 formed by the first housing body 101 and the second housing body 102 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.

[0124] 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.

[0125] In some embodiments, the battery 100 may also include other structures. For example, the battery 100 may also include a current-combining component disposed within the housing 10. The current-combining component connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0126] 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.

[0127] According to some embodiments of this application, refer to Figure 3 , Figure 4 and Figure 5 , Figure 3This 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. This application provides a battery cell 20, which includes a housing 1, an electrode assembly 2, a one-way valve assembly 3, and a protective patch 4. The housing 1 has a wall 11, and the electrode assembly 2 is housed within the housing 1. The one-way valve assembly 3 is disposed on the wall 11 and has a discharge port 31 for discharging gas from inside the housing 1. The protective patch 4 is disposed on the side of the wall 11 facing away from the electrode assembly 2. The protective patch 4 has a through-hole 41, the projection of which onto the thickness direction X of the wall is located within the one-way valve assembly 3, and the protective patch 4 covers the discharge port 31.

[0128] The outer shell 1 can also be used to contain electrolytes, such as electrolyte solution. The outer shell 1 can have various structural forms, such as a cylinder or a cuboid. Similarly, the outer shell 1 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0129] In some embodiments, the housing 1 may include a housing 12 and an end cap 13. The housing 12 has an internal cavity for accommodating the electrode assembly 2 and has an opening 121. That is, the housing 12 is a hollow structure with an opening 121 at one end. The end cap 13 covers the opening 121 of the housing 12 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 2 and the electrolyte.

[0130] It should be noted that the wall portion 11 for mounting the one-way valve assembly 3 can be the end cap 13 of the housing 1, or it can be a wall of the housing 12 of the housing 1. For example, in... Figure 4 In this embodiment, the wall portion 11 is the end cap 13. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the wall portion 11 can also be the bottom wall of the housing 12 and the end cap 13 that are opposite to each other, or the wall portion 11 can also be the side wall of the housing 12 and the end cap 13 that are adjacent to each other and connected to each other.

[0131] When assembling the battery cell 20, the electrode assembly 2 can be placed into the housing 12 first, and the housing 12 can be filled with electrolyte. Then, the end cap 13 can be closed onto the opening 121 of the housing 12 to complete the assembly of the battery cell 20.

[0132] The housing 12 can have various shapes, such as a cylinder, cuboid, or prism. The shape of the housing 12 can be determined based on the specific shape of the electrode assembly 2. For example, if the electrode assembly 2 is a cylinder, a cylindrical housing 12 can be used; if the electrode assembly 2 is a cuboid, a cuboid housing 12 can be used. Similarly, the end cap 13 can also have various structures, such as a plate-like structure or a hollow structure with one open end. For example, in… Figure 3 In the middle, the shell 12 has a cuboid structure.

[0133] Of course, it is understandable that the outer casing 1 is not limited to the structure described above. The outer casing 1 can also be other structures. For example, the outer casing 1 can include a housing 12 and two end caps 13. The housing 12 is a hollow structure with openings 121 on opposite sides. One end cap 13 is fitted onto one opening 121 of the housing 12 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 2 and the electrolyte. That is, the housing 12 has openings 121 on opposite sides, and the two end caps 13 are fitted onto the opposite sides of the housing 12 to close the corresponding openings 121.

[0134] It should be noted that the electrode assembly 2 is the component in the battery cell 20 where the electrochemical reaction occurs. The structure of the electrode assembly 2 can be various. For example, the electrode assembly 2 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.

[0135] 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.

[0136] Optionally, the electrode assembly 2 housed within the housing 1 can be one or more. For example, in... Figure 3 In this embodiment, the outer casing 1 of the battery cell 20 is provided with two electrode assemblies 2, which are stacked along their thickness direction. That is, the two electrode assemblies 2 are stacked along the thickness direction of the battery cell 20. Of course, in other embodiments, the electrode assemblies 2 housed in the outer casing 1 may be one, three, four, five, six, seven, or eight, etc.

[0137] It should be noted that the one-way valve assembly 3 is disposed on the wall portion 11. The one-way valve assembly 3 is used to discharge gas inside the housing 1, that is, the one-way valve assembly 3 can open in one direction to discharge gas, so that gas inside the housing 1 can be discharged to the outside of the housing 1 through the one-way valve assembly 3. Optionally, the structure of the one-way valve assembly 3 disposed on the wall portion 11 can be various. It can be that the one-way valve assembly 3 is welded to the wall portion 11, or it can be snapped onto the wall portion 11, or it can be glued to the wall portion 11. Here, the outside of the housing 1 refers to the external environment of the battery cell 20.

[0138] For example, in Figure 5 In the housing, a mounting hole 111 is provided on the wall portion 11, which connects the interior and exterior of the housing 1. A portion of the one-way valve assembly 3 is fitted into the mounting hole 111 and extends into the interior of the housing 1 along the thickness direction X of the wall portion. The one-way valve assembly 3 is sealed and connected to the wall surface of the mounting hole 111. It should be noted that the mounting hole 111 can also be directly connected to the exterior of the housing 1, that is, the mounting hole 111 penetrates the first surface 112 of the wall portion 11 away from the electrode assembly 2. The mounting hole 111 can also be indirectly connected to the exterior of the housing 1. For example, in... Figure 4 and Figure 5 In the middle, the first surface 112 of the wall portion 11 facing away from the electrode assembly 2 is provided with a mounting groove 113, and a mounting hole 111 is provided on the bottom surface of the mounting groove 113 so that the mounting hole 111 is indirectly connected to the outside of the outer shell 1 through the mounting groove 113.

[0139] The one-way valve assembly 3 has a discharge port 31 for discharging gas inside the housing 1. That is, the one-way valve assembly 3 has a discharge port 31 that communicates with the outside of the housing 1 so that the gas inside the housing 1 can be discharged to the outside of the housing 1 through the discharge port 31 of the one-way valve assembly 3.

[0140] The protective patch 4 is disposed on the side of the wall portion 11 opposite to the electrode assembly 2 to protect the wall portion 11 and reduce scratches or wear. The protective patch 4 can be mounted on the wall portion 11 in various ways, such as by adhesive or snap-fit.

[0141] The protective patch 4 covers the discharge port 31 of the one-way valve assembly 3. That is, the projection of the discharge port 31 in the thickness direction X of the wall is located inside the protective patch 4, so that the protective patch 4 can cover and hide the discharge port 31. In other words, in the thickness direction X of the wall, the discharge port 31 is not corresponding to the information acquisition hole 41, and the projection of the discharge hole is not inside the information acquisition hole 41.

[0142] The protective patch 4 is provided with an information acquisition hole 41 that penetrates the protective patch 4. The projection of the information acquisition hole 41 in the thickness direction X of the wall is located inside the one-way valve assembly 3. That is, the protective patch 4 is provided with an information acquisition hole 41 that penetrates the protective patch 4 along the thickness direction X of the wall, and the information acquisition hole 41 is set corresponding to the one-way valve assembly 3. Thus, the information code set on the one-way valve assembly 3 or the detection element connected to the one-way valve assembly 3 for sampling can be seen through the information acquisition hole 41.

[0143] 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.

[0144] Optionally, the protective patch 4 is made of an insulating material, so that the protective patch 4 is on the outside of the protective wall 11, reducing the possibility of scratches on the wall 11 and also providing insulation between the wall 11 and other components in the external environment, which helps to reduce the risk of short circuits. For example, the material of the protective patch 4 can be rubber, silicone, plastic, or other plastics.

[0145] In some embodiments, the battery cell 20 may further include an electrode terminal 5, which is insulated and mounted on the housing 1 and electrically connected to the electrode assembly 2 to output or input electrical energy to the battery cell 20.

[0146] It should be noted that the electrode terminal 5 is insulated and mounted on the housing 1, meaning that there is no electrical connection between the electrode terminal 5 and the housing 1.

[0147] Among them, Figure 3 In this configuration, each battery cell 20 includes two electrode terminals 5. Correspondingly, each electrode assembly 2 has two tabs 21 with opposite polarities. The two electrode terminals 5 are electrically connected to the two tabs 21 of the electrode assembly 2, 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 21 of the electrode assembly 2 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 21 are used to output the positive electrode of the electrode assembly 2, then the tabs 21 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 21 are used to output the negative electrode of the electrode assembly 2, then the tabs 21 are formed by stacking and connecting regions of the negative electrode sheet that are not coated with a negative active material layer.

[0148] For example, the electrode terminal 5 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0149] The structure in which the electrode terminal 5 is mounted on the housing 1 can be varied; for example, in... Figure 3 In this embodiment, both electrode terminals 5 are mounted on the end cap 13 of the outer casing 1. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, both electrode terminals 5 may be mounted on the housing 12 of the outer casing 1. Similarly, one electrode terminal 5 may be mounted on the housing 12 of the outer casing 1, and the other electrode terminal 5 may be mounted on the end cap 13 of the outer casing 1.

[0150] For example, in Figure 3 and Figure 4 In this structure, two electrode terminals 5 are both disposed on the wall portion 11. Correspondingly, along the thickness direction X of the wall portion, the protective patch 4 is provided with a second clearance hole 42 at the position corresponding to the electrode terminal 5. The second clearance hole 42 penetrates both sides of the protective patch 4 and is used for the power supply terminal 5 to pass through, thus avoiding the electrode terminal 5. Specifically, the wall portion 11 has two electrode terminals 5, and the protective patch 4 is provided with two second clearance holes 42, each second clearance hole 42 for one electrode terminal 5 to pass through.

[0151] In some embodiments, the battery cell 20 may further include a pressure relief mechanism 6, which is mounted on the housing 1. Optionally, the pressure relief mechanism 6 may be disposed on the end cap 13 of the housing 1 or on the housing 12 of the housing 1. The pressure relief mechanism 6 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.

[0152] For example, in Figure 3 and Figure 4 In the case, the pressure relief mechanism 6 is disposed on the wall portion 11 of the outer casing 1. Correspondingly, along the thickness direction X of the wall portion, the protective patch 4 is provided with a third clearance hole 43 at the position corresponding to the pressure relief mechanism 6. The third clearance hole 43 penetrates both sides of the protective patch 4. Along the thickness direction X of the wall portion, the projection of the pressure relief mechanism 6 is located within the third clearance hole 43, so that the third clearance hole 43 can avoid the pressure relief mechanism 6, thereby reducing the obstruction of the protective patch 4 to the pressure relief mechanism 6 when releasing the internal pressure of the battery cell 20.

[0153] For example, the pressure relief mechanism 6 can be a pressure relief component such as an explosion-proof valve, an explosion-proof disc, a pressure relief valve, or a safety valve.

[0154] By providing a one-way valve assembly 3 on the wall 11 of the outer casing 1, the one-way valve assembly 3 can open in one direction and discharge the gas inside the outer casing 1 to the outside of the outer casing 1 through the discharge port 31. Thus, when gas is generated inside the outer casing 1 during normal use of the battery cell 20, it can be discharged to the outside of the outer casing 1 through the one-way valve assembly 3. 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 causing the battery cell 20 to prematurely actuate and depressurize. This effectively improves the stability of the battery cell 20 in use, thereby increasing the service life and reliability of the battery cell 20. Furthermore, a protective patch 4 is provided on the side of the wall portion 11 facing away from the electrode assembly 2, thereby protecting the wall portion 11. An information acquisition hole 41 is provided on the protective patch 4, and the projection of the information acquisition hole 41 in the thickness direction X of the wall portion is located within the one-way valve assembly 3. The protective patch 4 covers the discharge port 31 of the one-way valve assembly 3, making the information acquisition hole 41 a structure corresponding to the one-way valve assembly 3 and covering the discharge port 31. This achieves two benefits: firstly, the discharge port 31 is hidden by the protective patch 4, which improves the aesthetics of the outer surface of the battery cell 20; secondly, the protective patch... Covering the discharge port 31 can reduce the risk of impurities or particulate matter in the external environment entering the discharge port 31 and causing blockage of the one-way valve assembly 3, which is beneficial to improving the reliability of the battery cell 20. On the other hand, by setting the one-way valve assembly 3 and the information collection hole 41 of the protective patch 4 to correspond, the area where the battery cell 20 exhausts through the one-way valve assembly 3 is set to correspond with the area where the information collection hole 41 of the protective patch 4 is set, which can save the space occupied by the information collection hole 41 and the one-way valve assembly 3 on the outer surface of the housing 1, which is beneficial to improving the integration of the battery cell 20.

[0155] According to some embodiments of this application, see Figure 3 and Figure 5 As shown, the one-way valve assembly 3 forms an exposed surface 32 at the position corresponding to the information acquisition hole 41, and the exposed surface 32 is a plane.

[0156] In this case, the one-way valve assembly 3 forms an exposed surface 32 at the position corresponding to the information acquisition hole 41. That is to say, the surface of the area where the information acquisition hole 41 of the one-way valve assembly 3 is exposed is the exposed surface 32.

[0157] It should be noted that the exposed surface 32 is a plane, that is, the exposed surface 32 is a continuous and complete plane, and no holes or grooves are provided on the exposed surface 32.

[0158] By setting the exposed surface 32 of the one-way valve assembly 3 corresponding to the information acquisition hole 41 as a plane, it is possible to set information codes or connect components such as detection elements for sampling on the exposed surface 32 of the planar structure, and further improve the aesthetics of the outer surface of the battery cell 20.

[0159] In some embodiments, please continue to see Figure 3 and Figure 5 As shown, along the thickness direction X of the wall portion, the wall portion 11 has a first surface 112 facing away from the electrode assembly 2, and the first surface 112 is flush with the exposed surface 32.

[0160] The first surface 112 is flush with the exposed surface 32. In other words, the surface of the area where the information collection hole 41 of the one-way valve assembly 3 is exposed is flush with the outer surface of the wall 11.

[0161] By setting the exposed surface 32 of the one-way valve assembly 3 corresponding to the information acquisition hole 41 and the first surface 112 of the wall portion 11 away from the electrode assembly 2 to be flush with each other, it is beneficial to further improve the aesthetics of the outer surface of the battery cell 20. On the other hand, it is convenient to set the protective patch 4 on the side of the wall portion 11 away from the electrode assembly 2, which helps to reduce the difficulty of assembling the protective patch 4 on the wall portion 11 and reduce the interference of the one-way valve assembly 3 on the protective patch 4.

[0162] According to some embodiments of this application, refer to Figure 3 , Figure 4 and Figure 5 Please refer to further details. Figure 6 , Figure 6 This is a schematic diagram of the assembly of the protective patch 4 and the shielding member 34 of the battery cell 20 provided in some embodiments of this application. The one-way valve assembly 3 forms an exposed surface 32 corresponding to the position of the information acquisition hole 41. The one-way valve assembly 3 includes a one-way valve 33 and a shielding member 34. The one-way valve 33 is mounted on the wall portion 11 and has a vent hole 331 for discharging gas from inside the outer casing 1. The shielding member 34 is connected to the wall portion 11. Along the thickness direction X of the wall portion, the shielding member 34 is located at the end of the one-way valve 33 opposite to the electrode assembly 2, covering the one-way valve 33. The shielding member 34 has a second surface 341 opposite to the one-way valve 33, and the second surface 341 includes the exposed surface 32. An exhaust channel 35 is formed between the shielding member 34 and the wall portion 11, communicating with the vent hole 331. One end of the exhaust channel 35 forms a discharge port 31 communicating with the outside of the outer casing 1.

[0163] The one-way valve 33 is installed on the wall portion 11. The one-way valve 33 has an outlet 331, which is used to discharge the gas inside the housing 1. That is, the one-way valve 33 can be opened in one direction and exhaust gas through the outlet 331, so that the gas inside the housing 1 can be discharged into the exhaust channel 35 through the one-way valve 33, and then discharged to the outside of the housing 1 through the exhaust port 31 of the exhaust channel 35. Optionally, the structure of the one-way valve 33 on the wall portion 11 can be various. It can be that the one-way valve 33 is welded to the wall portion 11, or it can be snapped onto the wall portion 11, or it can be glued to the wall portion 11.

[0164] For example, in Figure 5 In the middle, a portion of the one-way valve 33 is assembled into the mounting hole 111 and extends into the interior of the housing 1 along the thickness direction X of the wall portion, and the one-way valve 33 is sealed to the wall surface of the mounting hole 111.

[0165] The shielding member 34 is installed on the wall portion 11 along the thickness direction X of the wall portion. The shielding member 34 is located at the end of the one-way valve 33 opposite to the electrode assembly 2. That is, the shielding member 34 and the one-way valve 33 are arranged along the thickness direction X of the wall portion, and the shielding member 34 is further away from the electrode assembly 2 than the one-way valve 33. Optionally, the structure of the shielding member 34 installed on the wall portion 11 can be various. For example, the shielding member 34 can be installed on the wall portion 11 by welding, interference fit, bolting, snap-fitting, or bonding.

[0166] The shielding member 34 covers the one-way valve 33, that is, the projection of the one-way valve 33 in the thickness direction X of the wall is located inside the shielding member 34.

[0167] The shielding member 34 has a second surface 341 that is away from the one-way valve 33. The second surface 341 includes an exposed surface 32. That is, in the thickness direction X of the wall, the shielding member 34 is correspondingly arranged with the information acquisition hole 41 of the protective patch 4, such that the projection of the information acquisition hole 41 is located in the second surface 341 of the shielding member 34, and the area of ​​the second surface 341 exposed by the information acquisition hole 41 is the exposed surface 32.

[0168] An exhaust passage 35 is formed between the shield 34 and the wall portion 11. The exhaust passage 35 is connected to the vent 331. In other words, the shield 34 and the wall portion 11 together define the exhaust passage 35 that connects the vent 331 of the one-way valve 33 and the outside of the housing 1, so that the gas discharged from the inside of the housing 1 by the one-way valve 33 through the vent 331 can enter the exhaust passage 35 and then be discharged to the outside of the housing 1.

[0169] One end of the exhaust passage 35 is formed with an exhaust port 31 that connects to the outside of the housing 1. That is, one end of the exhaust passage 35 is connected to the air outlet 331 of the one-way valve 33, and the other end is formed with an exhaust port 31 that connects to the outside of the housing 1.

[0170] For example, the material of the shield 34 can be copper, iron, aluminum, steel or aluminum alloy, etc.

[0171] The one-way valve assembly 3 is provided with a one-way valve 33 and a shielding member 34. The one-way valve 33 is used to discharge gas inside the housing 1 through the vent 331. By providing a shielding member 34 at the end of the one-way valve 33 away from the electrode assembly 2, and the shielding member 34 covering the one-way valve 33, the second surface 341 of the shielding member 34 away from the one-way valve 33 forms an exposed surface 32. This ensures that the projection of the information acquisition hole 41 of the protective patch 4 in the thickness direction X of the wall is located within the second surface 341. The one-way valve assembly 3 with this structure... On the one hand, the valve assembly 3 facilitates the corresponding setting of the information acquisition hole 41 through the shielding member 34, so as to form an exposed surface 32 on the shielding member 34. This allows information codes or components such as detection elements for sampling to be set on the shielding member 34, which helps to reduce the damage or pulling caused by information codes or detection elements to the one-way valve 33. On the other hand, after the one-way valve 33 is covered by the shielding member 34, it is easier to form an exposed surface 32 on the shielding member 34, which helps to reduce the difficulty of forming the exposed surface 32.

[0172] According to some embodiments of this application, see Figure 4 , Figure 5 and Figure 6 As shown, along the thickness direction X of the wall portion, the wall portion 11 has a first surface 112 facing away from the electrode assembly 2. The first surface 112 is provided with a mounting groove 113. The bottom surface of the mounting groove 113 is provided with a mounting hole 111. At least a portion of the one-way valve 33 is disposed in the mounting hole 111, and at least a portion of the shielding member 34 is accommodated in the mounting groove 113.

[0173] The first surface 112 is provided with a mounting groove 113, and the bottom surface of the mounting groove 113 is provided with a mounting hole 111, that is, the mounting hole 111 penetrates the bottom surface of the mounting groove 113, so that the mounting hole 111 is a structure that communicates with the outside of the outer shell 1 through the mounting groove 113.

[0174] At least a portion of the shielding member 34 is accommodated within the mounting groove 113; that is, the shielding member 34 may be entirely located within the mounting groove 113, or it may only be partially located within the mounting groove 113. For example, in... Figure 5 and Figure 6 In the middle, the entire shielding component 34 is located within the mounting groove 113.

[0175] By providing a mounting groove 113 on the first surface 112 of the wall portion 11 away from the electrode assembly 2, and at least a portion of the shielding member 34 is accommodated in the mounting groove 113, on the one hand, the space occupied by the shielding member 34 and the wall portion 11 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 113 can play a certain positioning and limiting role for the shielding member 34, which is beneficial to reducing the assembly difficulty of the shielding member 34 connected to the wall portion 11.

[0176] According to some embodiments of this application, refer to Figure 5 and Figure 6 Please refer to further details. Figure 7 and Figure 8 , Figure 7 This is a top view of a battery cell 20 (after removing the protective patch 4) 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 exhaust channel 35 may include a first exhaust gap 351, which is formed between the shield 34 and the side of the mounting groove 113. The first exhaust gap 351 forms an exhaust port 31 at the end of the wall portion away from the electrode assembly 2 in the thickness direction X.

[0177] The first exhaust gap 351 serves to connect the vent 331 of the one-way valve 33 with the outside of the housing 1. The first exhaust gap 351 can be directly connected to the vent 331 of the one-way valve 33. For example, at least a portion of the projection of the first exhaust gap 351 in the thickness direction X of the wall is located within the mounting hole 111, allowing the vent 331 of the one-way valve 33 located within the mounting hole 111 to be directly connected to the first exhaust gap 351. Alternatively, the first exhaust gap 351 can also be indirectly connected to the vent 331 of the one-way valve 33. For example, in… Figure 5 and Figure 6 In the process, the exhaust passage 35 may also include a second exhaust gap 352, which is formed between the shield 34 and the bottom surface of the mounting groove 113. The second exhaust gap 352 connects the first exhaust gap 351 and the exhaust port 331 of the one-way valve 33.

[0178] The first exhaust gap 351 forms an exhaust port 31 at one end away from the electrode assembly 2 in the thickness direction X of the wall portion. That is, the first exhaust gap 351 is a structure formed between the shield 34 and the side of the mounting groove 113 and extending along the thickness direction X of the wall portion, so that an exhaust port 31 is formed at one end of the first exhaust gap 351 that penetrates the second surface 341 of the shield 34.

[0179] It should be noted that the structure of the first venting gap 351 formed between the shield 34 and the side of the mounting groove 113 can be varied; for example, refer to... Figure 7 and Figure 8 Please refer to further details. Figure 9 , Figure 9 This is a schematic diagram of the shielding member 34 of the one-way valve assembly 3 of the battery cell 20 provided in some embodiments of this application. The outer peripheral surface of the shielding member 34 includes a first corner surface 342 and at least two first side surfaces 343, with the first corner surface 342 connecting two adjacent first side surfaces 343. The groove side surface of the mounting groove 113 includes a second corner surface 1131 and at least two second side surfaces 1132, with the second corner surface 1131 connecting two adjacent second side surfaces 1132, and each second side surface 1132 connected to a first side surface 343. A first exhaust gap 351 is formed between the second corner surface 1131 and the first corner surface 342.

[0180] The first corner surface 342 connects two adjacent first side surfaces 343. That is, in the circumferential direction of the shielding member 34, the first corner surface 342 is located between the two first side surfaces 343 and connects the two first side surfaces 343. In other words, the first corner surface 342 is the surface at the corner of the outer peripheral surface of the shielding member 34.

[0181] The second corner surface 1131 connects two adjacent second side surfaces 1132. That is, in the circumferential direction of the mounting groove 113, the second corner surface 1131 is located between the two second side surfaces 1132 and connects the two second side surfaces 1132. In other words, the second corner surface 1131 is the surface at the corner of the side surface of the mounting groove 113.

[0182] Each first side 343 of the shield 34 abuts against and connects with the corresponding second side 1132 of the groove side of the mounting groove 113, so that the first corner surface 342 of the shield 34 and the second corner surface 1131 of the groove side of the mounting groove 113 face each other, thereby forming a first exhaust gap 351 between the first corner surface 342 and the second corner surface 1131.

[0183] Optionally, the connection structure between the first side 343 and the second side 1132 can be various, such as welding, bonding, or interference fit. For example, in this embodiment, the first side 343 and the second side 1132 are welded together. By configuring the first side 343 and the second side 1132 as a welded structure, the connection strength between the shielding member 34 and the side of the mounting groove 113 is improved, thereby enhancing the structural stability of the shielding member 34 assembled onto the wall portion 11.

[0184] Of course, the structure of the first venting gap 351 formed between the shielding member 34 and the side surface of the mounting groove 113 is not limited to this. For example, in other embodiments, a first groove may be provided on the outer peripheral surface of the shielding member 34, and the outer peripheral surface of the shielding member 34 is used to connect with the side surface of the mounting groove 113 to form a first venting gap 351 between the bottom surface of the first groove and the side surface of the mounting groove 113. In this embodiment, the outer peripheral surface of the shielding member 34 may be welded or bonded to the side surface of the mounting groove 113. Similarly, in other embodiments, a plurality of first protrusions may be provided on the outer peripheral surface of the shielding member 34. The plurality of first protrusions are arranged at intervals along the circumference of the shielding member 34, and the first protrusions are used to connect with the side surface of the mounting groove 113 to form a first venting gap 351 between the area of ​​the shielding member 34 where no first protrusion is provided and the side surface of the mounting groove 113. In this embodiment, the first protrusions and the side surface of the mounting groove 113 may be interference fit, welded or bonded.

[0185] Two adjacent first side surfaces 343 on the outer peripheral surface of the shielding member 34 are connected by a first corner surface 342, and two connected second side surfaces 1132 on the groove side surface of the mounting groove 113 are connected by a second corner surface 1131. Each first side surface 343 is connected to a second side surface 1132, and a first gap is formed between the first corner surface 342 and the second corner surface 1131. That is, a first venting gap 351 is formed at the corner of the shielding member 34 and the mounting groove 113. On the one hand, it is convenient to form a first venting gap 351 between the outer peripheral surface of the shielding member 34 and the groove side surface of the mounting groove 113. The structure is simple and easy to implement. On the other hand, while forming a first venting gap 351 between the outer peripheral surface of the shielding member 34 and the groove side surface of the mounting groove 113, it is beneficial to increase the connection area between the outer peripheral surface of the shielding member 34 and the groove side surface of the mounting groove 113, which is beneficial to improve the firmness of the shielding member 34 connected to the wall portion 11.

[0186] In some embodiments, see Figure 7 , Figure 8 and Figure 9 As shown, both the first corner surface 342 and the second corner surface 1131 are arc surfaces, and the radius of the first corner surface 342 is greater than the radius of the second corner surface 1131.

[0187] In this embodiment, both the first corner surface 342 and the second corner surface 1131 are arc surfaces. Specifically, the first corner surface 342 is the surface formed at the rounded corner of the outer peripheral surface of the shielding member 34, and similarly, the second corner surface 1131 is the surface formed at the rounded corner of the side surface of the mounting groove 113. Of course, in other embodiments, the first corner surface 342 may also be the surface formed at the chamfer of the outer peripheral surface of the shielding member 34, and the second corner surface 1131 may also be the surface formed at the chamfer of the side surface of the mounting groove 113.

[0188] The radius of the first corner surface 342 is greater than the radius of the second corner surface 1131, that is, the diameter of the rounded corner of the outer peripheral surface of the shield 34 is greater than the diameter of the rounded corner of the side surface of the mounting groove 113.

[0189] By setting both the first corner surface 342 and the second corner surface 1131 as arc surfaces, and the radius of the first corner surface 342 is greater than the radius of the second corner surface 1131, a first exhaust gap 351 is formed between the first corner surface 342 and the second corner surface 1131. The structure is simple and easy to manufacture and process.

[0190] In some embodiments, please continue to see Figure 7 , Figure 8 and Figure 9 As shown, the shielding member 34 has a rectangular cross-section in the thickness direction X perpendicular to the wall portion. The outer peripheral surface of the shielding member 34 includes four first side surfaces 343 and four first corner surfaces 342. At least one first corner surface 342 has a first exhaust gap 351 formed therein.

[0191] Among them, the cross-section of the shielding member 34 in the thickness direction X perpendicular to the wall is rectangular, that is, the shielding member 34 is a rectangular structure. Correspondingly, the shape of the mounting groove 113 matches the shielding member 34, and the mounting groove 113 is also a rectangular structure.

[0192] At least one first corner surface 342 is provided with a first exhaust gap 351. That is, the first exhaust gap 351 may be provided at the location of only one of the four first corner surfaces 342 of the shield 34, or it may be provided at the locations of two, three or four first corner surfaces 342.

[0193] It should be noted that in other embodiments, the cross-section of the shielding member 34 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 34 as a rectangular plate structure, the four sides of the shielding member 34 form four first side surfaces 343, and four first corner surfaces 342 are formed at the four right angles of the shielding member 34. The structure is simple and easy to manufacture.

[0195] By forming a first exhaust gap 351 that communicates with the outside of the housing 1 between the shield 34 and the side of the mounting groove 113, and forming an exhaust port 31 at the end of the first exhaust gap 351 away from the electrode assembly 2 in the thickness direction X of the wall, the gas discharged by the one-way valve 33 can be discharged to the outside of the housing 1 through the first exhaust gap 351. With this structure, the battery cell 20 does not need to have a channel opened on the shield 34, which helps to reduce the processing difficulty, improves the appearance of the battery cell 20, and makes it easier for the protective patch 4 to cover the exhaust port 31.

[0196] According to some embodiments of this application, see Figure 5 and Figure 6 As shown, the exhaust passage 35 may also include a second exhaust gap 352, which is formed between the shield 34 and the bottom surface of the mounting groove 113. The second exhaust gap 352 connects the first exhaust gap 351 and the air outlet 331.

[0197] The second exhaust gap 352 is formed between the shielding member 34 and the bottom surface of the mounting groove 113. It can be that the shielding member 34 and the bottom surface of the mounting groove 113 are arranged at intervals along the thickness direction X of the wall, so that the second exhaust gap 352 is formed between the surface of the shielding member 34 facing the bottom surface of the mounting groove 113 and the bottom surface of the mounting groove 113. Alternatively, a first groove 3441 can be provided on the surface of the shielding member 34 facing the bottom surface of the mounting groove 113, so that the bottom surface of the first groove 3441 and the bottom surface of the mounting groove 113 form the second exhaust gap 352.

[0198] It should be noted that in other embodiments, a first groove 3441 can be provided on the bottom surface of the mounting groove 113 so that a second venting gap 352 is formed between the bottom surface of the first groove 3441 and the surface of the shield 34 facing the bottom surface of the mounting groove 113.

[0199] For example, refer to Figure 5 and Figure 6 Please refer to further details. Figure 10 , Figure 10 This is a bottom view of the shielding member 34 of the one-way valve assembly 3 of the battery cell 20 provided in some embodiments of this application. Along the thickness direction X of the wall portion, the shielding member 34 has a fourth surface 344 facing the one-way valve 33. The fourth surface 344 overlaps the bottom surface of the mounting groove 113. The fourth surface 344 is provided with a first groove 3441. A second venting gap 352 is formed between the bottom surface of the fourth surface 344 and the bottom surface of the mounting groove 113.

[0200] The fourth surface 344 overlaps the bottom surface of the mounting groove 113, that is, part of the fourth surface 344 abuts against the bottom surface of the mounting groove 113. In other words, along the thickness direction X of the wall, the shielding member 34 abuts against the bottom surface of the mounting groove 113.

[0201] A second exhaust gap 352 is formed between the bottom surface of the first groove 3441 and the bottom surface of the mounting groove 113. That is, the bottom surface of the first groove 3441, the side surface of the first groove 3441, and the bottom surface of the mounting groove 113 jointly define the second exhaust gap 352.

[0202] By attaching the fourth surface 344 of the shielding member 34 to the bottom surface of the mounting groove 113, the shielding member 34 abuts against the bottom surface of the mounting groove 113, thereby improving the structural stability and reliability of the shielding member 34 installed in the mounting groove 113. In addition, by providing a first groove 3441 on the fourth surface 344, a second exhaust gap 352 is formed between the bottom surface of the first groove 3441 and the bottom surface of the mounting groove 113. This allows the gas discharged from the outlet 331 of the one-way valve 33 to enter the first exhaust gap 351 through the first groove 3441 and then be discharged to the outside of the outer casing 1. Thus, while ensuring that the shielding member 34 abuts against the bottom surface of the mounting groove 113, the first exhaust gap 351 and the outlet 331 can be connected through the first groove 3441.

[0203] In some embodiments, see Figure 5 , Figure 7 , Figure 8 and Figure 10 As shown, a plurality of first exhaust gaps 351 are formed between the shielding member 34 and the side of the mounting groove 113. The plurality of first exhaust gaps 351 are arranged at intervals along the circumference of the shielding member 34. A plurality of first grooves 3441 are provided on the fourth surface 344, and each first exhaust gap 351 is connected to a first groove 3441.

[0204] In this embodiment, the first groove 3441 extends radially along the shielding member 34 and penetrates the first corner surface 342, so that the second venting gap 352 formed between the bottom surface of the first groove 3441 and the bottom surface of the mounting groove 113 can communicate with the first venting gap 351 formed between the first corner surface 342 and the second corner surface 1131. Of course, in the embodiment where the first venting gap 351 is formed between the bottom surface of the first groove of the shielding member 34 and the side surface of the mounting groove 113, the first groove 3441 penetrates the bottom surface of the first groove. Similarly, in the embodiment where the first venting gap 351 is formed between the area on the outer peripheral surface of the shielding member 34 where the first protrusion is not provided and the side surface of the mounting groove 113, the first groove 3441 penetrates the area on the outer peripheral surface of the shielding member 34 where the first protrusion is not provided.

[0205] For example, in Figure 10 In the middle, the shielding member 34 has a rectangular structure and has four first corner surfaces 342. Each first corner surface 342 has a first exhaust gap 351. Correspondingly, the second surface 341 of the shielding member 34 is provided with four first grooves 3441, each first groove 3441 penetrating a first corner surface 342.

[0206] By forming a plurality of first exhaust gaps 351 between the shield 34 and the side of the mounting groove 113, and each first exhaust gap 351 being connected to a first groove 3441, it is beneficial to further improve exhaust efficiency.

[0207] In some embodiments, see Figure 5 , Figure 6 and Figure 10 As shown, the fourth surface 344 may also be provided with a second groove 3442, and a plurality of first grooves 3441 are provided around the second groove 3442 and are all connected to the second groove 3442. The second groove 3442 is connected to the air outlet 331 of the one-way valve 33.

[0208] Along the thickness direction X of the wall, the vent 331 is located at the end of the one-way valve 33 away from the electrode assembly 2. The vent 331 faces the second groove 3442, and the projection of the vent 331 is located in the second groove 3442.

[0209] For example, the projection of the one-way valve 33 in the thickness direction X of the wall is entirely located within the second groove 3442.

[0210] For example, the fourth surface 344 of the shield 34 is provided with four first grooves 3441. The four first grooves 3441 are arranged circumferentially at intervals along the second groove 3442. The first grooves 3441 extend radially along the shield 34 and penetrate the side of the second groove 3442, so that the first grooves 3441 can communicate with the air outlet 331 of the one-way valve 33 through the second groove 3442, thereby enabling the second exhaust gap 352 to communicate with the air outlet 331 of the one-way valve 33 through the second groove 3442.

[0211] By providing a second groove 3442 on the fourth surface 344 of the shield 34 facing the one-way valve 33, the second groove 3442 is connected to the air outlet 331 of the one-way valve 33, and multiple first grooves 3441 are arranged around the second groove 3442 and are all connected to the second groove 3442, so that the gas discharged from the air outlet 331 of the one-way valve 33 can enter the second groove 3442 and then pass through the multiple first grooves 3441 and then through the corresponding first exhaust gaps 351 to be discharged to the outside of the outer casing 1. This is beneficial to improve exhaust efficiency and can alleviate the phenomenon of gas accumulation between the shield 34 and the one-way valve 33.

[0212] The exhaust passage 35 also includes a second exhaust gap 352 formed between the shield 34 and the bottom surface of the mounting groove 113, and the second exhaust gap 352 connects the first exhaust gap 351 and the vent 331 to alleviate the phenomenon of exhaust obstruction between the vent 331 and the first exhaust gap 351 caused by the shield 34 abutting against the bottom surface of the mounting groove 113, thereby improving the smoothness of gas discharge from the vent 331 of the one-way valve 33 to the first exhaust gap 351.

[0213] According to some embodiments of this application, see Figure 5 and Figure 6 As shown, along the thickness direction X of the wall, the shielding member 34 does not extend beyond the first surface 112.

[0214] The shielding member 34 does not extend beyond the first surface 112, that is, the shielding member 34 does not extend into the mounting groove 113 in the thickness direction X of the wall, so that the entire shielding member 34 is located within the mounting groove 113.

[0215] By setting the shield 34 to not extend beyond the first surface 112 of the wall 11 away from the electrode assembly 2 in the thickness direction X of the wall, the mounting groove 113 can provide a certain degree of protection for the shield 34, thereby further reducing the wear of the shield 34.

[0216] In some embodiments, please continue to see Figure 5 and Figure 6 As shown, the first surface 112 is flush with the second surface 341.

[0217] Wherein, along the thickness direction X of the wall portion, the one-way valve 33 does not extend beyond the bottom surface of the mounting groove 113, that is, the one-way valve 33 is disposed in the mounting hole 111 and does not extend into the mounting groove 113 in the thickness direction X of the wall portion.

[0218] For example, in Figure 5 and Figure 6 In the middle, the end face of the one-way valve 33 facing away from the electrode assembly 2 in the thickness direction X of the wall is flush with the bottom surface of the mounting groove 113, and the projection of the one-way valve 33 in the thickness direction X of the wall is located in the second groove 3442, so that the one-way valve 33 and the bottom surface of the second groove 3442 are arranged at intervals along the thickness direction X of the wall. The end of the one-way valve 33 facing the electrode assembly 2 in the thickness direction X of the wall protrudes from the surface of the wall 11 facing the electrode assembly 2, so that part of the one-way valve 33 extends into the housing 1.

[0219] By setting the second surface 341 of the shielding member 34 away from the one-way valve 33 and the first surface 112 of the wall portion 11 away from the electrode assembly 2 to be flush with each other, on the one hand, it is beneficial to further improve the aesthetics of the outer surface of the battery cell 20 and facilitate the formation of an exposed surface 32 on the second surface 341 of the shielding member 34. On the other hand, it is convenient to set the protective patch 4 on the side of the wall portion 11 away from the electrode assembly 2, which helps to reduce the difficulty of assembling the protective patch 4 on the wall portion 11.

[0220] According to some embodiments of this application, refer to Figure 5 Please refer to further details. Figure 11 , Figure 12 and Figure 13 , Figure 11 This is a schematic diagram of the one-way valve 33 of the one-way valve assembly 3 of the battery cell 20 provided in some embodiments of this application. Figure 12 This is an exploded view of the one-way valve 33 of the one-way valve assembly 3 of the battery cell 20 provided in some embodiments of this application. Figure 13 This is a cross-sectional view of the one-way valve 33 of the one-way valve assembly 3 of the battery cell 20 provided in some embodiments of this application. The one-way valve 33 includes a valve body 332, an elastic element 333, and a sealing element 334. The valve body 332 is mounted on the wall portion 11, and an installation cavity 3321 is formed inside the valve body 332. An air inlet 3322 and an air outlet 331 are provided on the valve body 332. The air inlet 3322 communicates with the installation cavity 3321 and the interior of the outer casing 1, and the air outlet 331 communicates with the installation cavity 3321 and the exhaust passage 35. The elastic element 333 is disposed in the installation cavity 3321, and the sealing element 334 is movably disposed in the installation cavity 3321. The sealing element 334 is used to block the air inlet 3322 under the action of the elastic element 333, and to open the air inlet 3322 under the action of the gas inside the outer casing 1.

[0221] The air inlet 3322 is used to connect the mounting cavity 3321 and the interior of the outer shell 1, that is, the gas inside the outer shell 1 can enter the mounting cavity 3321 through the air inlet 3322. Similarly, the air outlet 331 is used to connect the mounting cavity 3321 and the exhaust channel 35, that is, the gas inside the outer shell 1 that enters the mounting cavity 3321 can enter the exhaust channel 35 through the air outlet 331, and then be discharged to the outside of the outer shell 1 through the exhaust port 31 of the exhaust channel 35.

[0222] The sealing member 334 is movably disposed within the mounting cavity 3321, that is, the sealing member 334 can move within the mounting cavity 3321 so that the sealing member 334 can block the air inlet 3322 when it moves closer to the air inlet 3322, and conversely, the air inlet 3322 can be opened when the sealing member 334 moves away from the air inlet 3322.

[0223] The sealing element 334 is used to block the air inlet 3322 under the action of the elastic element 333, and to open the air inlet 3322 under the action of the gas inside the housing 1. That is, the elastic element 333 can provide elastic force to the sealing element 334, so that the sealing element 334 can abut against the bottom surface of the mounting cavity 3321 to block the air inlet 3322. Conversely, when the force of the gas inside the housing 1 acting on the sealing element 334 is greater than the elastic force of the elastic element 333, the gas inside the housing 1 can overcome the elastic force of the elastic element 333 and push the sealing element 334 to separate from the bottom surface of the mounting cavity 3321, so that the sealing element 334 opens the air inlet 3322, thereby allowing the gas inside the housing 1 to enter the mounting cavity 3321 through the air inlet 3322 and then be discharged through the air outlet 331.

[0224] Optionally, the elastic element 333 is a component with elasticity, and its structure can be various, such as a sheet, spring, or elastic rubber. For example, in... Figure 12 and Figure 13 In this embodiment, the elastic element 333 is a spring. Of course, in other embodiments, the elastic element 333 and the sealing element 334 can also be an integral elastic component, such as elastic rubber.

[0225] It should be noted that the projection of the vent 331 on the thickness direction X of the wall can be located inside the spring or outside the spring. When there are multiple vents 331, the projections of the multiple vents 331 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.

[0226] The one-way valve 33 includes a valve body 332, an elastic element 333, and a sealing element 334. The valve body 332 is disposed on the wall portion 11. The valve body 332 is provided with an air inlet 3322 that connects the mounting cavity 3321 and the interior of the outer shell 1, and an air outlet 331 that connects the mounting cavity 3321 and the exhaust channel 35. By disposing both the elastic element 333 and the sealing element 334 within the mounting cavity 3321, the elastic element 333 can apply an elastic force to the sealing element 334, enabling the sealing element 334 to block the air inlet 3322 and prevent gas from outside the outer shell 1 from entering the interior of the outer shell 1. When the pressure inside the outer shell 1 rises, the gas inside the outer shell 1 can act on the sealing element 334 and overcome the elastic force of the elastic element 333, allowing the sealing element 334 to open the air inlet 3322. This allows the gas inside the outer shell 1 to be discharged after the one-way valve 33 is opened in one direction, thereby realizing the one-way exhaust function of the one-way valve 33.

[0227] According to some embodiments of this application, see Figure 5 , Figure 6 , Figure 11 , Figure 12 and Figure 13 As shown, the valve body 332 may include a valve body 3323 and a valve cover 3324. The valve body 3323 is mounted on the wall portion 11, and an air inlet 3322 is provided at the end of the valve body 3323 near the electrode assembly 2 in the thickness direction X of the wall portion. Along the thickness direction X of the wall portion, the valve cover 3324 is connected to the end of the valve body 3323 away from the electrode assembly 2. The valve cover 3324 and the valve body 3323 together form an installation cavity 3321. The valve cover 3324 and the sealing member 334 are spaced apart. The two ends of the elastic member 333 abut against the valve cover 3324 and the sealing member 334 respectively. The valve cover 3324 is provided with an air outlet 331.

[0228] The wall portion 11 is provided with a mounting hole 111, the valve body 3323 is installed in the mounting hole 111, and the valve body 3323 extends into the housing 1 along the thickness direction X of the wall portion, that is, the valve body 3323 protrudes from the surface of the wall portion 11 facing the electrode assembly 2 along the thickness direction X of the wall portion.

[0229] The structure of the valve body 3323 mounted on the wall 11 can be varied. For example, the valve body 3323 can be welded to the wall of the mounting hole 111, or it can be bonded to the wall of the mounting hole 111 with sealant.

[0230] For example, the air inlet 3322 is located at one end of the valve body 3323 in the thickness direction X of the wall portion, near the electrode assembly 2. That is, the air inlet 3322 penetrates the bottom surface of the mounting cavity 3321. Correspondingly, the sealing member 334 is movably disposed within the mounting cavity 3321 along the thickness direction X of the wall portion, so that the sealing member 334 can block the air inlet 3322 when it abuts against the bottom surface of the mounting cavity 3321. Of course, in other embodiments, the air inlet 3322 may also be located on one side of the valve body 3323 in the radial direction, and correspondingly, the sealing member 334 is movably disposed within the mounting cavity 3321 in the radial direction of the valve body 3323.

[0231] For example, an air outlet 331 is provided on the valve cover 3324, and the air outlet 331 penetrates both sides of the valve cover 3324 along the thickness direction X of the wall. Figure 12 In this embodiment, the valve cover 3324 is provided with three vent holes 331, which are arranged around the central axis of the mounting hole 111. Of course, in other embodiments, the vent holes 331 provided on the valve cover 3324 may be one, two, four, or five, etc.

[0232] As an example, there are multiple air vents 331 on the valve cover 3324, and the multiple air vents 331 are arranged at equal intervals.

[0233] As an example, multiple vents 331 are arranged at equal intervals around the center of the valve cover 3324, which allows for smoother gas flow.

[0234] In some embodiments, see Figure 12 and Figure 13 As shown, the valve cover 3324 is connected to the valve body 3323. A groove 3323a is provided at the end of the valve body 3323 facing away from the electrode assembly 2, and at least a portion of the valve cover 3324 is accommodated within the groove 3323a. By providing a groove 3323a at the end of the valve body 3323 facing away from the electrode assembly 2, and with at least a portion of the valve cover 3324 accommodated within the groove 3323a, the one-way valve 33 with this structure can save space occupied by the valve body 332 in the thickness direction X of the wall portion. Furthermore, it can improve the structural stability of the valve cover 3324 assembled on the valve body 3323, and provide some protection for the valve cover 3324, reducing wear or damage to the valve cover 3324.

[0235] The mounting cavity 3321 penetrates the bottom surface of the sink 3323a, and the valve cover 3324 is assembled in the sink 3323a and abuts against the bottom surface of the sink 3323a, so that the valve cover 3324 and the valve body 3323 enclose each other to form the mounting cavity 3321.

[0236] At least a portion of the valve cover 3324 is accommodated within the recess 3323a; that is, the valve cover 3324 may be entirely located within the recess 3323a or partially located within the recess 3323a. In other words, in the thickness direction X of the wall, the valve cover 3324 may extend beyond the recess 3323a or may not extend beyond the recess 3323a. For example, in... Figure 13 In the middle, the valve cover 3324 is located entirely within the settling tank 3323a.

[0237] For example, the valve body 3323 can be made of a metal, such as copper, iron, aluminum, steel, or aluminum alloy. Similarly, the valve cover 3324 can also be made of a metal, such as copper, iron, aluminum, steel, or aluminum alloy. The valve body 3323 and the valve cover 3324 can be made of the same material or different materials.

[0238] The valve body 332 of the one-way valve 33 includes a valve body 3323 and a valve cover 3324. By connecting the valve cover 3324 to the end of the valve body 3323 away from the electrode assembly 2 in the thickness direction X of the wall portion, the valve cover 3324 and the valve body 3323 jointly define the mounting cavity 3321 for accommodating the elastic element 333 and the sealing element 334. The one-way valve 33 with this structure sets the valve body 332 into two parts, which facilitates the assembly of the elastic element 333 and the sealing element 334 into the mounting cavity 3321, and helps to reduce the assembly difficulty of the one-way valve 33. Furthermore, by setting the valve cover 3324 and the sealing member 334 to be arranged at intervals along the thickness direction X of the wall, the two ends of the elastic member 333 can respectively abut against the valve cover 3324 and the sealing member 334, so that the sealing member 334 can block the air inlet 3322 at the end of the valve body 3323 facing the electrode assembly 2 along the thickness direction X of the wall under the action of the elastic member 333. The one-way valve 33 with this structure makes it easy for the elastic member 333 to apply elastic force to the sealing member 334 so that the sealing member 334 blocks the air inlet 3322, and can reduce the assembly difficulty of the elastic member 333.

[0239] According to some embodiments of this application, see Figure 5 , Figure 12 and Figure 13 As shown, along the thickness direction X of the wall, the valve cover 3324 and the sealing member 334 are spaced apart, the two ends of the elastic member 333 abut against the valve cover 3324 and the sealing member 334 respectively, and the air inlet 3322 is provided on the bottom surface of the mounting cavity 3321.

[0240] The valve cover 3324 and the bottom surface of the mounting cavity 3321 are arranged facing each other. The two ends of the elastic member 333 in the thickness direction X of the wall abut against the valve cover 3324 and the sealing member 334 respectively, so that the elastic member 333 is compressed between the valve cover 3324 and the sealing member 334, so that the elastic member 333 can provide elastic force to the sealing member 334, thereby enabling the sealing member 334 to block the air inlet 3322 provided on the bottom surface of the mounting cavity 3321 under the action of the elastic force of the elastic member 333.

[0241] In some embodiments, see Figure 12 and Figure 13As shown, a first guide post 3324a protrudes from the side of the valve cover 3324 facing the sealing member 334, and part of the elastic member 333 is sleeved on the outside of the first guide post 3324a. By providing a first guide post 3324a protruding from the side of the valve cover 3324 facing the sealing member 334, and partially sleeved on the outside of the first guide post 3324a, the one-way valve 33 with this structure can, on the one hand, use the first guide post 3324a to position the elastic member 333, facilitating its assembly and reducing the assembly difficulty; on the other hand, the first guide post 3324a can guide the elastic member 333 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 333 along the thickness direction X, improving its reliability and reducing the risk of the sealing member 334 accidentally opening the air inlet 3322.

[0242] Among them, the elastic element 333 is a spring, and part of the spring is sleeved on the outside of the first guide post 3324a. The end of the spring away from the sealing element 334 abuts against the surface of the valve cover 3324 where the first guide post 3324a is protruding, that is, the first guide post 3324a is inserted into the spring.

[0243] For example, the central axis of the first guide post 3324a coincides with the central axis of the mounting hole 111, and the central axis of the elastic element 333 coincides with the central axis of the first guide post 3324a.

[0244] It should be noted that in the embodiment where multiple air vents 331 are provided on the valve cover 3324, the multiple air vents 331 surround the outer side of the first guide post 3324a. Of course, in other embodiments, the air vents 331 may also be a structure that penetrates the first guide post 3324a along the thickness direction X of the wall.

[0245] By setting the valve cover 3324 and the sealing member 334 to be arranged at intervals along the thickness direction X of the wall, the two ends of the elastic member 333 can respectively abut against the valve cover 3324 and the sealing member 334, so that the sealing member 334 can block the air inlet 3322 on the bottom surface of the mounting cavity 3321 along the thickness direction X of the wall under the action of the elastic member 333. That is, the air inlet 3322 is located at the end of the valve body 3323 facing the electrode assembly 2 in the thickness direction X of the wall. The sealing member 334 can move along the thickness direction X of the wall under the action of the elastic member 333 and block the air inlet 3322. The one-way valve 33 with this structure makes it easy for the elastic member 333 to apply elastic force to the sealing member 334 so that the sealing member 334 blocks the air inlet 3322, and can reduce the assembly difficulty of the elastic member 333.

[0246] In some embodiments, see Figure 5 , Figure 6 , Figure 11 , Figure 12 and Figure 13 As shown, the wall portion 11 has a first surface 112 facing away from the electrode assembly 2. A mounting groove 113 is provided on the first surface 112. A shielding member 34 is assembled into the mounting groove 113. A mounting hole 111 is provided on the bottom surface of the mounting groove 113, communicating with the interior of the outer shell 1. The valve body 3323 is installed in the mounting hole 111 and protrudes from the surface of the wall portion 11 facing the electrode assembly 2 along the thickness direction X of the wall portion. The mounting hole 111 includes a first hole segment 1111 and a second hole segment 1112, arranged along the thickness direction X of the wall portion. The first hole segment 1111 is located on the side of the second hole segment 1112 facing away from the electrode assembly 2, and the diameter of the first hole segment 1111 is larger than the diameter of the second hole segment 1112. The valve body 3323 has a connecting portion 3323b located in the first hole section 1111. The connecting portion 3323b is an annular structure extending circumferentially along the valve body 3323. The connecting portion 3323b is welded to the hole wall of the first hole section 1111 to form a weld mark of the annular structure.

[0247] Optionally, see Figure 11 and Figure 13 As shown, a stress relief groove 3323c is also provided on the connecting part 3323b. The stress relief groove 3323c is an annular groove structure and surrounds the outside of the valve cover 3324. By providing the stress relief groove 3323c on the connecting part 3323b, the welding stress generated by the welding between the connecting part 3323b and the hole wall of the first hole section 1111 can be released. This reduces the impact of welding stress on the weld between the hole wall of the first hole section 1111 and the connecting part 3323b, reduces the risk of weld cracking, and thus reduces the risk of seal failure at the weld.

[0248] According to some embodiments of this application, see Figure 5 , Figure 12 and Figure 13 As shown, the sealing member 334 has a second guide post 3341 protruding on the side facing the valve cover 3324, and part of the elastic member 333 is sleeved on the outside of the second guide post 3341.

[0249] Among them, the elastic element 333 is a spring, and part of the spring is sleeved on the outside of the second guide post 3341. The end of the spring away from the valve cover 3324 abuts against the surface of the sealing element 334 on which the second guide post 3341 is protruding, that is, the second guide post 3341 is inserted into the spring.

[0250] For example, the central axis of the second guide post 3341 coincides with the central axis of the mounting hole 111, and the central axis of the elastic member 333 coincides with the central axis of the second guide post 3341.

[0251] By providing a second guide post 3341 protruding from the side of the sealing member 334 facing the valve cover 3324, and partially sleeved on the outside of the second guide post 3341, the one-way valve 33 with this structure can, on the one hand, use the second guide post 3341 to position the elastic member 333, facilitating its assembly and reducing the assembly difficulty; on the other hand, the second guide post 3341 can guide the elastic member 333 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 333 along the thickness direction X, improving its reliability and reducing the risk of the sealing member 334 accidentally opening the air inlet 3322.

[0252] According to some embodiments of this application, see Figure 12 and Figure 13 As shown, the sealing member 334 may include a pressing part 3342 and a sealing part 3343. Along the thickness direction X of the wall, the two ends of the elastic member 333 abut against the pressing part 3342 and the valve cover 3324 or the shielding member 34, respectively. The sealing part 3343 is connected to the side of the pressing part 3342 away from the valve cover 3324 or the shielding member 34. The sealing part 3343 is used to block the air inlet 3322.

[0253] The elastic element 333 provides an elastic force to the pressing part 3342 so that the pressing part 3342 can press against the sealing part 3343, thereby sealing the air inlet 3322 through the sealing part 3343.

[0254] Optionally, the rigidity of the clamping part 3342 is greater than that of the sealing part 3343, meaning the deformation resistance of the clamping part 3342 is greater than that of the sealing part 3343. This allows the clamping part 3342 to better press the sealing part 3343 against the bottom surface of the mounting cavity 3321, thereby sealing the air inlet 3322. For example, the clamping part 3342 can be made of various materials, such as steel, iron, or aluminum. Similarly, the sealing part 3343 can also be made of various materials, such as rubber, silicone, or plastic.

[0255] Alternatively, the connection structure between the clamping part 3342 and the sealing part 3343 can be various, such as snap-fit, bolt connection or adhesive connection.

[0256] It should be noted that in the embodiment where the sealing member 334 is provided with a second guide post 3341, the second guide post 3341 protrudes from the surface of the pressing part 3342 facing the valve cover 3324 or the shielding member 34.

[0257] By configuring the sealing member 334 into two parts, namely a pressing part 3342 and a sealing part 3343, the pressing part 3342 is disposed on the side of the sealing part 3343 facing the valve cover 3324. The sealing part 3343 is used to block the air inlet 3322. The two ends of the elastic member 333 abut against the valve cover 3324 and the pressing part 3342 respectively, so that the elastic member 333 can exert elastic force on the sealing part 3343 through the pressing part 3342. This helps to improve the balance of the elastic force exerted by the elastic member 333 on the sealing part 3343, thereby effectively improving the sealing effect of the sealing part 3343 on the air inlet 3322.

[0258] According to some embodiments of this application, please continue to refer to Figure 12 and Figure 13 As shown, along the thickness direction X of the wall portion, the pressing part 3342 has a snap-fit ​​groove 3342a on the side facing the sealing part 3343, and the sealing part 3343 has a snap-fit ​​part 3343a protruding on the side facing the pressing part 3342. The snap-fit ​​part 3343a is inserted into the snap-fit ​​groove 3342a, and the snap-fit ​​part 3343a and the snap-fit ​​groove 3342a are engaged. The sealing member 334 with this structure can improve the structural stability of the sealing part 3343 on the pressing part 3342, so as to reduce the radial slippage of the sealing part 3343 relative to the pressing part 3342, thereby improving the sealing effect of the sealing part 3343 on the air inlet 3322 and reducing the phenomenon of the air inlet 3322 being accidentally opened.

[0259] For example, the snap-fit ​​part 3343a is a circular cylindrical structure, and the corresponding snap-fit ​​groove 3342a is a circular groove.

[0260] In some embodiments, the sealing portion 3343 is bonded to the pressing portion 3342. Using an adhesive structure to connect the sealing portion 3343 and the pressing portion 3342 improves the structural stability of the connection between the sealing portion 3343 and the pressing portion 3342, reducing the risk of the sealing portion 3343 and the pressing portion 3342 detaching from each other, thus enhancing the reliability of the sealing portion 3343 in blocking the air inlet 3322. Furthermore, it facilitates the assembly connection between the sealing portion 3343 and the pressing portion 3342, reducing the assembly difficulty between them.

[0261] For example, the material of the sealing part 3343 can be EPDM, fluororubber, or Teflon. Using EPDM, fluororubber, or Teflon to make the sealing part 3343 gives it good corrosion resistance, effectively mitigating the corrosion of the sealing part 3343 by the electrolyte, thus improving its service life and reducing the likelihood of poor sealing of the air inlet 3322 due to corrosion.

[0262] It should be noted that in some embodiments, the sealing member 334 may not have the pressing part 3342, and the sealing member 334 may only include the sealing part 3343, with one end of the elastic member 333 directly abutting against the sealing part 3343.

[0263] According to some embodiments of this application, refer to Figure 14 , Figure 14 This is a partial cross-sectional view of a battery cell 20 provided in some embodiments of this application. A one-way valve assembly 3 has an exposed surface 32 at the location corresponding to the information acquisition hole 41. The one-way valve assembly 3 includes a one-way valve 33, which is mounted on the wall portion 11 and has a discharge port 31. Along the thickness direction X of the wall portion, the end of the one-way valve 33 facing away from the electrode assembly 2 has an exposed surface 32.

[0264] The one-way valve 33 has a discharge port 31, which is a discharge port 31 for connecting to the outside of the housing 1.

[0265] Along the thickness direction X of the wall portion, the end of the one-way valve 33 facing away from the electrode assembly 2 has an exposed surface 32. That is, in the thickness direction X of the wall portion, the one-way valve 33 is correspondingly positioned to the information acquisition hole 41 of the protective patch 4, such that the projection of the information acquisition hole 41 is located within the surface of one end of the one-way valve 33, making the exposed area 32 the part of the one-way valve 33 facing away from the electrode assembly 2 exposed by the information acquisition hole 41. In other words, the one-way valve assembly 3 does not have a shielding member 34, allowing the information acquisition hole 41 to be exposed on the one-way valve 33, enabling the information code or other detection elements to be mounted on the one-way valve 33. It should be noted that the structure of the one-way valve 33 can be the same as the one-way valve 33 described above.

[0266] The one-way valve assembly 3 is provided with a one-way valve 33, and the one-way valve 33 has a discharge port 31, so that the one-way valve 33 can directly discharge the gas inside the housing 1 through the discharge port 31. By forming an exposed surface 32 at the end of the one-way valve 33 away from the electrode assembly 2, the projection of the information acquisition hole 41 of the protective patch 4 in the thickness direction X of the wall falls directly into the one-way valve 33. This makes the one-way valve 33 a structure that corresponds to the information acquisition hole 41 in the thickness direction X of the wall. Thus, information codes or components such as detection elements for sampling can be directly set in the area of ​​the one-way valve 33 corresponding to the information acquisition hole 41. The structure is simple and easy to assemble, which helps to reduce the assembly difficulty of the battery cell 20.

[0267] In some embodiments, see Figure 14 As shown, the one-way valve 33 may include a valve body 332, an elastic element 333, and a sealing element 334. The valve body 332 is mounted on the wall portion 11, and an installation cavity 3321 is formed inside the valve body 332. The valve body 332 is provided with an air inlet 3322 and an exhaust port 31. The air inlet 3322 connects the installation cavity 3321 and the interior of the outer shell 1, and the exhaust port 31 connects the installation cavity 3321 and the exterior of the outer shell 1. The elastic element 333 is disposed in the installation cavity 3321, and the sealing element 334 is movably disposed in the installation cavity 3321. The sealing element 334 is used to block the air inlet 3322 under the action of the elastic element 333, and is used to open the air inlet 3322 under the action of the gas inside the outer shell 1. Along the thickness direction X of the wall portion, an exposed surface 32 is formed at the end of the valve body 332 facing away from the electrode assembly 2.

[0268] The valve body 332 is provided with a discharge port 31, which is a discharge port 31 for communicating with the outside of the outer casing 1.

[0269] The valve body 332 has an exposed surface 32 at one end away from the electrode assembly 2. That is, the projection of the information acquisition hole 41 of the protective patch 4 in the thickness direction X of the wall is located in the surface of the valve body 332 at one end away from the electrode assembly 2, so that the area of ​​the valve body 332 exposed by the information acquisition hole 41 forms an exposed surface 32.

[0270] exist Figure 14 In the structure, a mounting hole 111 is provided on the wall portion 11. The one-way valve 33 is installed in the mounting hole 111. The mounting hole 111 extends through both sides of the wall portion 11 along the thickness direction X, that is, the mounting hole 111 directly penetrates the first surface 112 and the surface of the wall portion 11 facing the electrode assembly 2, so that the mounting hole 111 is a structure that directly communicates with the outside of the outer shell 1. It should be noted that the valve body 332 of the one-way valve 33 is welded to the hole wall of the mounting hole 111. The connection structure can be the same as the connection structure between the one-way valve 33 and the hole wall of the mounting hole 111 described above, and the mounting hole 111 can also have the same structure as the mounting hole 111 described above.

[0271] The one-way valve 33 includes a valve body 332, an elastic element 333, and a sealing element 334. The valve body 332 is disposed on the wall 11. The valve body 332 is provided with an air inlet 3322 that connects the mounting cavity 3321 and the interior of the outer shell 1, and an exhaust port 31 that connects the exterior of the outer shell 1. By disposing of both the elastic element 333 and the sealing element 334 in the mounting cavity 3321, the elastic element 333 can apply an elastic force to the sealing element 334, so that the sealing element 334 can block the air inlet 3322, thereby preventing gas from the exterior of the outer shell 1 from entering the interior of the outer shell 1. When the pressure inside the outer shell 1 rises, the gas inside the outer shell 1 can act on the sealing element 334 and overcome the elastic force of the elastic element 333, so that the sealing element 334 can open the air inlet 3322, thereby allowing the gas inside the outer shell 1 to be discharged after the one-way valve 33 is opened in one direction, thus realizing the one-way exhaust function of the one-way valve 33. Furthermore, by forming an exposed surface 32 at the end of the valve body 332 facing away from the electrode assembly 2 in the thickness direction X of the wall, the projection of the information acquisition hole 41 in the thickness direction X of the wall falls directly onto the valve body 332, which is simple in structure and easy to implement.

[0272] In some embodiments, please continue to see Figure 14 As shown, the valve body 332 may include a valve body 3323 and a valve cover 3324. The valve body 3323 is mounted on the wall portion 11, and an air inlet 3322 is provided at one end of the valve body 3323 near the electrode assembly 2 in the thickness direction X of the wall portion. Along the thickness direction X of the wall portion, the valve cover 3324 is connected to the end of the valve body 3323 away from the electrode assembly 2. The valve cover 3324 has a third surface 3324b away from the electrode assembly 2, and the third surface 3324b includes an exposed surface 32. The valve cover 3324 and the valve body 3323 together form an installation cavity 3321. The valve cover 3324 and the sealing member 334 are spaced apart, and the two ends of the elastic member 333 abut against the valve cover 3324 and the sealing member 334, respectively. The valve cover 3324 is provided with an air outlet 331, which is connected to the mounting cavity 3321. The end of the air outlet 331 that penetrates the third surface 3324b forms a discharge port 31.

[0273] The valve cover 3324 has a third surface 3324b that is away from the electrode assembly 2. The third surface 3324b includes an exposed surface 32. That is, in the thickness direction X of the wall, the valve cover 3324 is correspondingly set with the information acquisition hole 41 of the protective patch 4, so that the projection of the information acquisition hole 41 is located in the third surface 3324b of the valve cover 3324, and the area of ​​the third surface 3324b exposed by the information acquisition hole 41 is the exposed surface 32.

[0274] The vent 331 penetrates the third surface 3324b to form a discharge port 31. That is, the valve cover 3324 is provided with a vent 331 that connects the mounting cavity 3321 and the outside of the outer shell 1. The vent 331 penetrates the third surface 3324b, so that the end of the vent 331 that penetrates the third surface 3324b is the discharge port 31. In other words, the protective patch 4 covers the vent 331 in the thickness direction X of the wall.

[0275] Of course, in other embodiments, the discharge port 31 formed on the valve body 332 can also be other structures. For example, a third exhaust gap is formed between the valve cover 3324 and the valve body 3323, the third exhaust gap is connected to the mounting cavity 3321, and the exhaust port 31 is formed at the end of the third exhaust gap away from the electrode assembly 2 in the thickness direction X of the wall. That is, in the embodiment where a groove 3323a is provided at one end of the valve body 3323 and the valve cover 3324 is installed in the groove 3323a, a third exhaust gap extending along the thickness direction X of the wall can be formed between the valve cover 3324 and the groove side of the groove 3323a, such that the exhaust port 31 is formed at the end of the third exhaust gap away from the electrode assembly 2 in the thickness direction X of the wall.

[0276] The valve body 332 is provided with a valve body 3323 and a valve cover 3324. By connecting the valve cover 3324 to the end of the valve body 3323 facing away from the electrode assembly 2, an exposed surface 32 is formed on the third surface 3324b of the valve cover 3324 facing away from the electrode assembly 2. That is, the projection of the information acquisition hole 41 in the thickness direction X of the wall is located within the third surface 3324b, which facilitates the formation of the exposed surface 32 on the valve body 332 and reduces the difficulty of forming the exposed surface 32 on the valve body 332. In addition, by providing an vent 331 on the valve cover 3324, the vent 331 penetrates one end of the third surface 3324b of the valve cover 3324 to form a discharge port 31. The valve body 332 with this structure can reduce the interference effect of the vent 331 on the connection between the valve cover 3324 and the valve body 3323, which helps to reduce the assembly difficulty of the valve cover 3324 and the valve body 3323. Similarly, by providing a third exhaust gap between the valve cover 3324 and the valve body 3323, the end of the third exhaust gap away from the electrode assembly 2 in the thickness direction X of the wall forms an exhaust port 31. The valve body 332 with this structure is easy for the protective patch 4 to cover the exhaust port 31, which helps to reduce the difficulty of the protective patch 4 covering the exhaust port 31.

[0277] According to some embodiments of this application, see Figure 14As shown, along the thickness direction X of the wall portion, the wall portion 11 has a first surface 112 facing away from the electrode assembly 2. A mounting hole 111 is provided on the wall portion 11, which penetrates the first surface 112. At least a portion of the valve body 3323 is installed in the mounting hole 111, and the third surface 3324b is flush with the first surface 112.

[0278] By setting the third surface 3324b of the valve cover 3324 away from the electrode assembly 2 and the first surface 112 of the wall portion 11 away from the electrode assembly 2 to be flush with each other, it is beneficial to further improve the aesthetics of the outer surface of the battery cell 20 and facilitate the formation of an exposed surface 32 on the third surface 3324b of the valve cover 3324. On the other hand, it is convenient to set the protective patch 4 on the side of the wall portion 11 away from the electrode assembly 2, which helps to reduce the difficulty of assembling the protective patch 4 on the wall portion 11.

[0279] In some embodiments, please continue to see Figure 14 As shown, along the thickness direction X of the wall, the valve body 3323 does not extend beyond the first surface 112.

[0280] For example, the end face of the valve body 3323 facing away from the electrode assembly 2 in the thickness direction X of the wall is flush with the first surface 112. Correspondingly, a groove 3323a is provided on the end face of the valve body 3323 facing away from the electrode assembly 2 in the thickness direction X of the wall. The valve cover 3324 is installed in the groove 3323a. In the thickness direction X of the wall, the third surface 3324b of the valve cover 3324 facing away from the electrode assembly 2 is flush with the end face of the valve body 3323 facing away from the electrode assembly 2 in the thickness direction X of the wall.

[0281] By setting the valve body 3323 to a structure that does not extend beyond the first surface 112 of the wall portion 11 away from the electrode assembly 2, the phenomenon of the valve body 3323 protruding from the first surface 112 of the wall portion 11 is alleviated. On the one hand, this is beneficial to improving the aesthetics of the outer surface of the battery cell 20, and on the other hand, it can reduce the interference effect of the valve body 3323 on the protective patch 4, thereby reducing the difficulty of assembling the protective patch 4 on the wall portion 11.

[0282] In some embodiments, refer to Figure 4 , Figure 5 and Figure 14 Please refer to further details. Figure 15 , Figure 15This is a partial cross-sectional view of the insulating member 7 provided in some embodiments of this application. The battery cell 20 may also include the insulating member 7, which is disposed on the side of the wall portion 11 facing the electrode assembly 2. Along the thickness direction X of the wall portion, the valve body 332 of the one-way valve 33 protrudes from the surface of the wall portion 11 facing the electrode assembly 2. The insulating member 7 includes a body portion 71 and a receiving portion 72. The body portion 71 is disposed on the side of the wall portion 11 facing the electrode assembly 2, and the receiving portion 72 is connected to the body portion 71. The portion of the valve body 332 of the one-way valve 33 that protrudes from the surface of the wall portion 11 facing the electrode assembly 2 is received within the receiving portion 72.

[0283] The insulating member 7 is disposed on the side of the wall portion 11 facing the electrode assembly 2. The insulating member 7 serves to separate the wall portion 11 from the electrode assembly 2, thereby insulating and isolating the wall portion 11 from the electrode assembly 2.

[0284] For example, the insulating element 7 can be made of various materials, such as rubber, silicone, or plastic.

[0285] The portion of the valve body 332 of the one-way valve 33 protruding from the surface of the wall portion 11 facing the electrode assembly 2 is housed in the receiving portion 72. That is, the insulating member 7 has a receiving portion 72 formed at the position corresponding to the one-way valve 33, and the receiving portion 72 covers the outer side of the portion of the valve body 332 of the one-way valve 33 protruding from the surface of the wall portion 11 facing the electrode assembly 2.

[0286] Optionally, the body portion 71 and the receiving portion 72 of the insulating member 7 can be an integral structure or a separate structure. When the body portion 71 and the receiving portion 72 are an integral structure, they can be integrally formed by processes such as injection molding or milling. When the body portion 71 and the receiving portion 72 are separate structures, the receiving portion 72 can be connected to the body portion 71 by means of bonding or snap-fitting. For example, in Figure 15 In the middle, the main body 71 and the receiving part 72 are an integral structure.

[0287] In some embodiments, see Figure 5 , Figure 14 and Figure 15 As shown, the receiving part 72 is provided with a through hole 721, which communicates with the air inlet 3322 provided on the valve body 332.

[0288] The receiving part 72 is provided with a through hole 721, and the through hole 721 penetrates the receiving part 72, so that the through hole 721 can connect the interior of the receiving part 72 and the interior of the outer shell 1, so that the air inlet 3322 of the valve body 332 can connect to the interior of the outer shell 1 through the through hole 721.

[0289] By providing a through hole 721 on the receiving part 72, the through hole 721 can connect the interior of the outer shell 1 and the interior of the receiving part 72, so that the air inlet 3322 of the valve body 332 of the one-way valve 33 can communicate with the interior of the outer shell 1 through the through hole 721. This allows the gas inside the outer shell 1 to enter the receiving part 72 through the through hole 721 and then be discharged to the outside of the outer shell 1 through the one-way valve 33. This eliminates the need for the gas to enter the receiving part 72 through the gap between the body part 71 and the wall part 11 and then be discharged through the one-way valve 33, which helps to improve the smoothness of the one-way valve 33 in discharging the gas inside the outer shell 1.

[0290] In some embodiments, see Figure 5 , Figure 14 and Figure 15 As shown, along the thickness direction X of the wall portion, an air inlet 3322 is provided at one end of the valve body 332 facing the electrode assembly 2. The receiving portion 72 includes a first wall 722 and a second wall 723. The first wall 722 surrounds the valve body 332. Along the thickness direction X of the wall portion, one end of the first wall 722 is connected to the body portion 71, and the second wall 723 is connected to the end of the first wall 722 away from the body portion 71. A through hole 721 is provided in the second wall 723.

[0291] The first wall 722 is arranged around the valve body 332, that is, the first wall 722 of the receiving part 72 is an annular structure arranged around the valve body 332.

[0292] One end of the first wall 722 is connected to the main body 71, and the second wall 723 is connected to the end of the first wall 722 away from the main body 71. That is, the second wall 723 is connected to the main body 71 through the first wall 722, and the second wall 723 and the first wall 722 together enclose and form a receiving part 72 for accommodating the valve body 332. The second wall 723 is a wall that faces the receiving part 72 and the air inlet 3322.

[0293] The through hole 721 is provided on the second wall 723, that is, the through hole 721 is provided on the end of the receiving portion 72 facing the electrode assembly 2. Of course, in other embodiments, the through hole 721 may also be provided on the first wall 722, that is, the through hole 721 is provided on one side of the receiving portion 72 in the radial direction.

[0294] The receiving portion 72 is provided with a first wall 722 and a second wall 723 that are interconnected. The first wall 722 surrounds the valve body 332, and the second wall 723 is located at the end of the valve body 332 facing the electrode assembly 2 in the thickness direction X of the wall portion. The first wall 722 and the second wall 723 are arranged to form a receiving portion 72 for accommodating the portion of the valve body 332 that extends into the interior of the outer casing 1. By setting the through hole 721 of the receiving portion 72 on the first wall 722, it is beneficial to increase the path of gas from the through hole 721 into the air inlet 3322 of the valve body 332, so as to alleviate the phenomenon of electrolyte overflow with gas. By setting the through hole 721 of the receiving portion 72 on the second wall 723, it is beneficial to realize that the air inlet 3322 and the through hole 721 are correspondingly set, so as to improve the smoothness of the one-way valve 33 discharging gas into the interior of the outer casing 1.

[0295] According to some embodiments of this application, refer to Figure 5 , Figure 6 and Figure 14 Please refer to further details. Figure 16 , Figure 16 This is a schematic diagram showing the connection between the protective patch 4 and the adhesive layer 8 provided in some embodiments of this application. The adhesive layer 8 is provided on the side of the protective patch 4 facing the wall portion 11. The adhesive layer 8 adheres the protective patch 4 and the wall portion 11. The adhesive layer 8 is provided with a first clearance hole 81 at the position corresponding to the information acquisition hole 41. Along the thickness direction X of the wall portion, the projections of the information acquisition hole 41 and the discharge port 31 are both located within the first clearance hole 81.

[0296] The adhesive layer 8 serves to bond the protective patch 4 and the wall portion 11. For example, the adhesive layer 8 can be glue or double-sided tape disposed between the protective patch 4 and the wall portion 11.

[0297] Along the thickness direction X of the wall, the projections of the information collection hole 41 and the discharge port 31 are both located within the first clearance hole 81. That is, the area defined by the projection of the first clearance hole 81 onto a plane perpendicular to the thickness direction X of the wall covers the information collection hole 41 and the discharge port 31. In other words, the first clearance hole 81 can avoid the information collection hole 41 and the discharge port 31 in the thickness direction X of the wall.

[0298] For example, in Figure 5 and Figure 6 In the middle, the exhaust passage 35 includes a first exhaust gap 351, and the first exhaust gap 351 is formed between the shield 34 and the side of the mounting groove 113. The discharge port 31 is formed at one end of the first exhaust gap 351 that connects to the outside of the outer shell 1. Correspondingly, the projections of the mounting groove 113 and the shield 34 in the thickness direction X of the wall are located in the first clearance hole 81, so that the first clearance hole 81 can avoid the mounting groove 113 and the shield 34.

[0299] For example, in Figure 14 In the one-way valve 33, one end of the vent 331 on the valve cover 3324 of the valve body 332 forms a discharge port 31. Correspondingly, the projection of the vent 331 on the thickness direction X of the wall is located in the first clearance hole 81, so that the first clearance hole 81 can avoid the vent 331.

[0300] The area defined by the projection of the first clearance hole 81 in the thickness direction X of the wall covers the information acquisition hole 41 and the mounting groove 113. Since the projection of the information acquisition hole 41 in the thickness direction X of the wall is located within the shielding member 34, the area of ​​the first clearance hole 81 is larger than the area of ​​the mounting groove 113, and the area of ​​the mounting groove 113 is larger than the area of ​​the information acquisition hole 41.

[0301] By providing an adhesive layer 8 on the side of the protective patch 4 facing the wall portion 11, the protective patch 4 can be adhered to the wall portion 11 through the adhesive layer 8. This reduces the assembly difficulty of the protective patch 4 and improves the connection stability of the protective patch 4 on the wall portion 11. In addition, by providing a first clearance hole 81 at the position of the adhesive layer 8 corresponding to the information acquisition hole 41, and the projections of the information acquisition hole 41 of the protective patch 4 and the discharge port 31 of the one-way valve assembly 3 in the thickness direction X of the wall portion are both located within the first clearance hole 81, the obstruction of the discharge port 31 by the adhesive layer 8 is reduced. This allows the gas discharged through the discharge port 31 by the one-way valve assembly 3 to enter the information acquisition hole 41 through the gap between the protective patch 4 and the wall portion 11 and then be discharged. Thus, while ensuring that the protective patch 4 is adhered to the wall portion 11, the impact on the exhaust of the one-way valve assembly 3 is reduced.

[0302] According to some embodiments of this application, see Figure 3 and Figure 4 As shown, the housing 1 may include a housing 12 and an end cap 13. The interior of the housing 12 forms a receiving cavity with an opening 121 for receiving the electrode assembly 2. The end cap 13 closes the opening 121 and is a wall portion 11.

[0303] The end cap 13 is the wall portion 11, meaning that the one-way valve 33 is located on the end cap 13.

[0304] 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 12 includes a wall portion 11, that is, the one-way valve 33 is installed on one wall of the housing 12. The one-way valve 33 can be installed on the bottom wall of the housing 12 opposite to the end cap 13, or it can be installed on the side wall of the housing 12 adjacent to and connected to the end cap 13.

[0305] By designating the wall 11 of the outer casing 1 as an end cap 13 for closing the opening 121 of the housing 12, the battery cell 20 with this structure facilitates the installation of the one-way valve 33 on the end cap 13, reducing the assembly difficulty of the battery cell 20 and improving its production efficiency. Similarly, by designating the wall 11 of the outer casing 1 as a wall of the housing 12, the battery cell 20 with this structure reduces the stress generated when the end cap 13 is connected to the housing 12, thus mitigating the risk of damage to the one-way valve 33 and improving the stability and service life of the battery cell 20.

[0306] 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 6, which is disposed in the housing 1. The pressure relief mechanism 6 is configured to be actuated and release the internal pressure of the battery cell 20 when the battery cell 20 experiences thermal runaway. The actuation pressure of the pressure relief mechanism 6 is greater than the opening pressure of the one-way valve 33.

[0307] The pressure relief mechanism 6 is disposed on the outer casing 1, and can be disposed on the end cap 13 or on the housing 12. For example, in Figure 4 In the middle, the pressure relief mechanism 6 is installed on the end cover 13.

[0308] The pressure relief mechanism 6 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 6 can be actuated and opened to release the gas and other gases generated inside the battery cell 20 due to thermal runaway.

[0309] The actuation pressure of the pressure relief mechanism 6 is greater than the opening pressure of the one-way valve 33. In other words, the pressure at which the gas inside the casing 1 opens the pressure relief mechanism 6 is greater than the pressure at which the gas inside the casing 1 opens the one-way valve 33. It should be noted that when the battery cell 20 experiences thermal runaway, the gas inside the casing 1 of the battery cell 20 will rapidly increase to open the pressure relief mechanism 6 for pressure relief. However, during normal use, when the gas generated inside the casing 1 of the battery cell 20 reaches a threshold, it can open the one-way valve 33, but it cannot open the pressure relief mechanism 6.

[0310] Optionally, the pressure relief mechanism 6 can be integrally formed with the outer shell 1 or it can be a separate structure. If the pressure relief mechanism 6 is integrally formed with the outer shell 1, then the pressure relief mechanism 6 is located in an area of ​​the outer shell 1 with a weak structure, such as an area with a groove. If the pressure relief mechanism 6 is a separate structure from the outer shell 1, then the pressure relief mechanism 6 can be connected to the outer shell 1 by welding, hot melting, injection molding, or bonding. For example, in... Figure 4In the design, the pressure relief mechanism 6 and the outer shell 1 are separate structures, and the pressure relief mechanism 6 is located on the end cover 13 of the outer shell 1. The pressure relief mechanism 6 can be a pressure relief component such as an explosion-proof valve, an explosion-proof disc, a pressure relief valve, or a safety valve.

[0311] For example, in Figure 4 In this embodiment, both the electrode terminal 5 and the pressure relief mechanism 6 are disposed on the end cover 13. Of course, in other embodiments, the electrode terminal 5 and the pressure relief mechanism 6 may also be disposed on different walls of the housing 1. For example, the pressure relief mechanism 6 is disposed on the housing 12 and the electrode terminal 5 is disposed on the end cover 13.

[0312] By setting the opening pressure of the one-way valve 33 to be less than the actuation pressure of the pressure relief mechanism 6, when gas is generated inside the casing 1 during normal use of the battery cell 20, it can be discharged to the outside of the casing 1 through the one-way valve 33. This alleviates the phenomenon that the pressure relief mechanism 6 is prematurely actuated to relieve pressure before the battery cell 20 thermal runaway due to the rise in internal gas pressure. In this way, the stability of the battery cell 20 can be effectively improved, thereby increasing the service life and reliability of the battery cell 20.

[0313] In some embodiments, the one-way valve 33 and the pressure relief mechanism 6 may be disposed on the same wall of the housing 1. For example, both the one-way valve 33 and the pressure relief mechanism 6 may be disposed on the end cap 13.

[0314] In some embodiments, the one-way valve 33 and the pressure relief mechanism 6 may be disposed on different walls of the housing 1. For example, the one-way valve 33 may be disposed on the end cap 13, and the pressure relief mechanism 6 may be disposed on the housing 12.

[0315] In some embodiments, the exhaust rate of the one-way valve 33 is less than the exhaust rate of the pressure relief mechanism 6.

[0316] By setting the exhaust rate of the one-way valve 33 to be less than the exhaust rate of the pressure relief mechanism 6, the phenomenon that the pressure relief mechanism 6 cannot be actuated and opened due to the excessive exhaust rate of the one-way valve 33 when the battery cell 20 experiences thermal runaway can be alleviated. This allows the pressure relief mechanism 6 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.

[0317] 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 assembly 3, can promptly release the gas generated during normal operation, thereby improving the battery's lifespan.

[0318] 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.

[0319] 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 101 and a second housing body 102, which cover each other and together define an assembly space for accommodating the battery cell 20.

[0320] Optionally, in Figure 2 In this embodiment, the second box body 102 can be a hollow structure with one end open, and the first box body 101 can be a plate-like structure. The first box body 101 covers the open side of the second box body 102, so that the first box body 101 and the second box body 102 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 101 and the second box body 102 can also both be hollow structures with one side open, and the open side of the first box body 101 covers the open side of the second box body 102.

[0321] Of course, the box 10 formed by the first box body 101 and the second box body 102 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.

[0322] 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.

[0323] 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.

[0324] 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.

[0325] 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.

[0326] The electrical device can be any of the aforementioned devices or systems that utilize battery cells 20.

[0327] According to some embodiments of this application, see Figures 3 to 13 And to Figures 15 to 16As shown, this application provides a battery cell 20, which includes a housing 1, an electrode assembly 2, a one-way valve assembly 3, a protective patch 4, and an insulating member 7. The housing 1 has a wall portion 11, and includes a shell 12 and an end cap 13. The interior of the shell 12 forms a receiving cavity with an opening 121, in which the electrode assembly 2 is received. The end cap 13 closes the opening 121 and is part of the wall portion 11. Along the thickness direction X of the wall portion, the wall portion 11 has a first surface 112 facing away from the electrode assembly 2. The first surface 112 is provided with a mounting groove 113, and the bottom surface of the mounting groove 113 is provided with a mounting hole 111. The one-way valve assembly 3 includes a one-way valve 33 and a blocking member 34. The one-way valve 33 is installed in the mounting hole 111 and protrudes from the surface of the wall portion 11 facing the electrode assembly 2. The one-way valve 33 is used to discharge gas inside the housing 1. The one-way valve 33 includes a valve body 332, an elastic member 333, and a sealing member 334. A portion of the valve body 332 is disposed within the mounting hole 111. An mounting cavity 3321 is formed inside the valve body 332. An air inlet 3322 and an air outlet 331 are provided on the valve body 332. The air inlet 3322 connects the mounting cavity 3321 to the interior of the outer casing 1, and the air outlet 331 connects the mounting cavity 3321 to the exhaust passage 35. An elastic element 333 is disposed within the mounting cavity 3321, and a sealing element 334 is movably disposed within the mounting cavity 3321. The sealing element 334 is used to seal the air inlet 3322 under the action of the elastic element 333, and to open the air inlet 3322 under the action of gas inside the outer casing 1. The valve body 332 includes a valve body 3323 and a valve cover 3324. The valve body 3323 is installed in the mounting hole 111, and an air inlet 3322 is provided at the end of the valve body 3323 facing the electrode assembly 2. Along the thickness direction X of the wall, the valve cover 3324 is connected to the end of the valve body 3323 away from the electrode assembly 2. The valve cover 3324 and the valve body 3323 together form a mounting cavity 3321. The valve cover 3324 is provided with an air outlet 331. The valve cover 3324 and the sealing member 334 are spaced apart. The two ends of the elastic member 333 abut against the valve cover 3324 and the sealing member 334 respectively. The air inlet 3322 is provided on the bottom surface of the mounting cavity 3321. The shielding member 34 is made of the same material as the wall portion 11. The shielding member 34 is disposed in the mounting groove 113. The shielding member 34 has a second surface 341 facing away from the electrode assembly 2, and the second surface 341 is flush with the first surface 112. Along the thickness direction X of the wall portion, the shielding member 34 is located at the end of the one-way valve 33 facing away from the electrode assembly 2, and the shielding member 34 covers the one-way valve 33. An exhaust passage 35 is formed between the shielding member 34 and the wall portion 11. The exhaust passage 35 includes a first exhaust gap 351 and a second exhaust gap 352. The first exhaust gap 351 is formed between the shielding member 34 and the groove side of the mounting groove 113, and the end of the first exhaust gap 351 that connects to the outside of the outer casing 1 forms an outlet 31.The shielding member 34 and the mounting groove 113 have rectangular cross-sections in the thickness direction X perpendicular to the wall portion. The outer peripheral surface of the shielding member 34 includes four first corner surfaces 342 and four first side surfaces 343. Each pair of adjacent first side surfaces 343 is connected by a first corner surface 342. The bottom surface of the mounting groove 113 includes four second corner surfaces 1131 and four second side surfaces 1132. Each pair of adjacent second side surfaces 1132 is connected by a second corner surface 1131. Each first side surface 343 abuts against and is welded to its corresponding second side surface 1132. A first venting gap 351 is formed between each first corner surface 342 and its corresponding second corner surface 1131. Both the first corner surfaces 342 and the second corner surfaces 1131 are arc surfaces, and the radius of the first corner surface 342 is larger than the radius of the second corner surface 1131. Along the thickness direction X of the wall portion, the shielding member 34 has a third surface 3324b facing the one-way valve 33. The third surface 3324b overlaps the bottom surface of the mounting groove 113. The third surface 3324b is provided with four first grooves 3441. The first grooves 3441 extend radially along the shielding member 34 and penetrate a first corner surface 342. A second exhaust gap 352 is formed between the bottom surface of the first groove 3441 and the bottom surface of the mounting groove 113. The third surface 3324b is also provided with a second groove 3442. The multiple first grooves 3441 are provided around the second groove 3442 and are all connected to the second groove 3442. The second groove 3442 is connected to the vent 331. Along the thickness direction X of the wall portion, the vent 331 is provided facing the second groove 3442, and the projection of the vent 331 is located within the second groove 3442. A protective patch 4 is disposed on the side of the wall portion 11 facing away from the electrode assembly 2. The protective patch 4 has an information acquisition hole 41 penetrating through it. The projection of the information acquisition hole 41 in the thickness direction X of the wall portion lies within the second surface 341 of the shielding member 34. The area of ​​the second surface 341 exposed by the information acquisition hole 41 forms an exposed surface 32, which is planar and flush with the first surface 112. The protective patch 4 covers the discharge port 31. An adhesive layer 8 is disposed on the side of the protective patch 4 facing the wall portion 11, bonding the protective patch 4 to the wall portion 11. A first clearance hole 81 is provided in the adhesive layer 8 corresponding to the position of the information acquisition hole 41. Along the thickness direction X of the wall portion, the projections of the information acquisition hole 41, the mounting groove 113, and the shielding member 34 are all located within the first clearance hole 81. The insulating member 7 includes a body portion 71 and a receiving portion 72. The body portion 71 is disposed on the side of the wall portion 11 facing the electrode assembly 2, and the receiving portion 72 is connected to the body portion 71. The portion of the one-way valve 33 extending into the housing 1 is received in the receiving portion 72.The receiving portion 72 includes a first wall 722 and a second wall 723. The first wall 722 surrounds the valve body 332. Along the thickness direction X of the wall portion, one end of the first wall 722 is connected to the main body portion 71. The second wall 723 is connected to the end of the first wall 722 away from the main body portion 71. A through hole 721 is provided on the second wall 723, and the through hole 721 communicates with the interior of the air inlet 3322 housing 1.

[0328] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0329] 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 in that, include: The outer shell has walls; Electrode assembly, housed within the housing; A one-way valve assembly is disposed on the wall portion, the one-way valve assembly having a discharge port for discharging gas from inside the housing; as well as A protective patch is disposed on the side of the wall portion opposite to the electrode assembly; The protective patch is provided with an information collection hole that penetrates the protective patch. The projection of the information collection hole in the thickness direction of the wall is located inside the one-way valve assembly. The protective patch covers the discharge port. The one-way valve assembly includes a one-way valve and a shielding member. The one-way valve has a vent for discharging gas from inside the housing. Along the thickness direction of the wall, the shielding member is located at the end of the one-way valve opposite to the electrode assembly. An exhaust channel is formed between the shielding member and the wall, and the exhaust channel communicates with the vent. One end of the exhaust channel forms the discharge port. Alternatively, The one-way valve assembly includes a one-way valve having the discharge port. Along the thickness direction of the wall portion, the end of the one-way valve facing away from the electrode assembly forms an exposed surface, which corresponds to the position of the information acquisition hole. Along the thickness direction of the wall portion, the wall portion has a first surface facing away from the electrode assembly, which is flush with the exposed surface.

2. The battery cell according to claim 1, characterized in that, The one-way valve assembly forms an exposed surface corresponding to the position of the information acquisition hole, and the exposed surface is a plane.

3. The battery cell according to claim 2, 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 being flush with the exposed surface.

4. The battery cell according to any one of claims 1-3, characterized in that, The one-way valve assembly forms an exposed surface corresponding to the position of the information acquisition hole, and the shielding member has a second surface away from the one-way valve, the second surface including the exposed surface.

5. The battery cell according to claim 4, 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.

6. The battery cell according to claim 5, 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 exhaust port is formed at the end of the first exhaust gap away from the electrode assembly in the thickness direction of the wall.

7. The battery cell according to claim 6, 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.

8. The battery cell according to any one of claims 5-7, characterized in that, Along the thickness direction of the wall portion, the shielding member does not extend beyond the first surface.

9. The battery cell according to claim 8, characterized in that, The first surface is flush with the second surface.

10. The battery cell according to any one of claims 4-9, characterized in that, The one-way valve includes: A valve body is installed on the wall, 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 connects the installation cavity and the interior of the outer shell, and the air outlet connects 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.

11. The battery cell according to claim 10, characterized in that, The valve body includes: A valve body is installed on the wall portion, and the valve body has an air inlet at one end of the wall portion near the electrode assembly in the thickness direction of the wall portion. A valve cover is connected to the end of the valve body away from the electrode assembly along the thickness direction of the wall. The valve cover and the valve body together enclose the mounting cavity. 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. The valve cover is provided with the vent hole.

12. The battery cell according to any one of claims 1-3, characterized in that, The one-way valve includes: A valve body is installed on the wall, and an installation cavity is formed inside the valve body. An air inlet and an exhaust port are provided on the valve body. The air inlet connects the installation cavity and the interior of the outer shell, and the exhaust port connects the installation cavity and the exterior of the outer shell. 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. Wherein, along the thickness direction of the wall portion, the valve body has an exposed surface at the end opposite to the electrode assembly.

13. The battery cell according to claim 12, characterized in that, The valve body includes: A valve body is installed on the wall portion, and the valve body has an air inlet at one end of the wall portion near the electrode assembly in the thickness direction of the wall portion. A valve cover, along the thickness direction of the wall portion, is connected to one end of the valve body away from the electrode assembly. The valve cover has a third surface away from the electrode assembly, the third surface including the exposed surface. The valve cover and the valve body together enclose the mounting cavity. 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. The valve cover is provided with an air outlet, which communicates with the mounting cavity, and one end of the air outlet that penetrates the third surface forms the discharge port; or A third venting gap is formed between the valve cover and the valve body. The third venting gap communicates with the mounting cavity. The exhaust port is formed at the end of the third venting gap away from the electrode assembly in the thickness direction of the wall portion.

14. The battery cell according to claim 13, characterized in that, Along the thickness direction of the wall portion, the wall portion has a first surface facing away from the electrode assembly, and a mounting hole is provided on the wall portion, the mounting hole penetrating the first surface, and at least a portion of the valve body is mounted in the mounting hole; The third surface is flush with the first surface.

15. The battery cell according to claim 14, characterized in that, Along the thickness direction of the wall portion, the valve body does not extend beyond the first surface.

16. The battery cell according to any one of claims 1-15, characterized in that, An adhesive layer is provided on the side of the protective patch facing the wall portion, and the adhesive layer bonds the protective patch and the wall portion; The adhesive layer has a first clearance hole corresponding to the position of the information collection hole. Along the thickness direction of the wall, the projections of the information collection hole and the discharge port are both located within the first clearance hole.

17. The battery cell according to any one of claims 1-16, 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.

18. A battery, characterized in that, Includes the battery cell as described in any one of claims 1-17.

19. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-17, the battery cell being used to provide electrical energy.

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