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 and a one-way valve. The shell has a wall portion, the electrode assembly is accommodated in the shell, and the one-way valve is arranged on the wall portion and is used for discharging gas inside the shell. By arranging the one-way valve on the wall portion of the shell, the one-way valve can be opened in one direction and discharge the gas inside the shell to the outside of the shell, so that when the gas is generated inside the shell during normal use of the battery monomer, the gas can be discharged to the outside of the shell through the one-way valve, thereby relieving the phenomenon that the internal pressure of the battery monomer reaches the threshold value in advance due to the rise of the internal gas pressure of the battery monomer, and the use stability of the battery monomer can be effectively improved, so that the service life and use reliability of the battery monomer are improved.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese patent application 2023107208122, 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, and a one-way valve; the housing has a wall; the electrode assembly is housed within the housing; the one-way valve is disposed on the wall and is used to discharge gas from inside the housing.

[0008] In the above technical solution, by setting a one-way valve on the wall of the outer casing, the one-way valve can open in one direction and discharge the gas inside the casing to the outside of the casing. Thus, when gas is generated inside the casing during normal use of the battery cell, it can be discharged to the outside of the casing through the one-way valve, thereby alleviating the phenomenon that the internal pressure of the battery cell will reach the threshold prematurely due to the rise in internal gas pressure. This can effectively improve the stability of the battery cell in use, thereby improving the service life and reliability of the battery cell.

[0009] In some embodiments, the one-way valve includes a valve body and a valve core; the valve body is disposed on the wall portion, and an installation cavity is formed inside the valve body; the valve body is provided with an air inlet and an air outlet, the air inlet being used to communicate with the interior of the installation cavity and the interior of the housing, and the air outlet being used to communicate with the exterior of the installation cavity and the exterior of the housing; the valve core is disposed in the installation cavity, and the valve core is used to block the air inlet and to open the air inlet under the action of gas inside the housing.

[0010] In the above technical solution, the one-way valve is provided with a valve body and a valve core. The valve body is disposed on the wall and has an air inlet connecting the mounting cavity and the inside of the housing, and an air outlet connecting the mounting cavity and the outside of the housing. By placing the valve core in the mounting cavity, the valve core can block the air inlet. When the pressure inside the housing rises, the gas inside the housing can act on the valve core and drive the valve core to open the air inlet, so as to realize the one-way exhaust function of the one-way valve, thereby enabling the one-way valve to discharge the gas inside the housing to the outside of the housing.

[0011] In some embodiments, the valve body includes a valve body and a valve cover; the valve body is disposed on the wall portion and has the air inlet; along the thickness direction of the wall portion, the valve cover is disposed at one end of the valve body away from the electrode assembly, and the valve cover and the valve body together enclose the mounting cavity.

[0012] In the above technical solution, the valve body of the one-way valve is provided with a valve body and a valve cover. By connecting the valve cover to the end of the valve body away from the electrode assembly in the thickness direction of the wall, the valve cover and the valve body jointly define the mounting cavity for accommodating the valve core. The one-way valve with this structure sets the valve body into two parts, which makes it easier to assemble the valve core into the mounting cavity and helps to reduce the assembly difficulty of the one-way valve.

[0013] In some embodiments, the valve cover is connected to the valve body, and the air outlet is a first through hole provided on the valve cover.

[0014] In the above technical solution, by setting a first through hole on the valve cover of the valve body to form the air outlet of the valve body, the mounting cavity of the valve body can be connected to the outside of the outer shell through the first through hole set on the valve cover. The valve body with this structure can reduce the interference effect of the air outlet on the connection between the valve cover and the valve body, which is beneficial to reduce the assembly difficulty of the valve cover and the valve body.

[0015] In some embodiments, the valve cover is connected to the valve body, and the vent is a first exhaust gap formed between the valve cover and the valve body.

[0016] In the above technical solution, by setting a first exhaust gap between the valve cover and the valve body to form an exhaust port of the valve body, the mounting cavity of the valve body can be connected to the outside of the outer shell through the first exhaust gap formed between the valve cover and the valve body. The structure is simple and easy to process.

[0017] In some embodiments, the valve cover is connected to the valve body, and the valve body has a recess at one end away from the electrode assembly, with at least a portion of the valve cover accommodated in the recess.

[0018] In the above technical solution, by setting a groove on the end of the valve body away from the electrode assembly, and at least part of the valve cover is accommodated in the groove, the one-way valve with this structure can save the space occupied by the valve body in the thickness direction of the wall, improve the structural stability of the valve cover assembled on the valve body, and provide a certain degree of protection for the valve cover to reduce the phenomenon of wear or damage to the valve cover.

[0019] In some embodiments, along the thickness direction of the wall portion, the valve cover does not extend beyond the end of the valve body opposite to the electrode assembly.

[0020] In the above technical solution, by setting the valve cover in the thickness direction of the wall portion to not exceed the end of the valve body away from the electrode assembly, the entire valve cover is located in the sink groove, thereby further saving the space occupied by the valve body in the thickness direction of the wall portion and further improving the protection of the valve cover, so as to reduce the phenomenon of wear or damage to the valve cover.

[0021] 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 valve body does not extend beyond the first surface.

[0022] In the above technical solution, by setting the valve body of the valve body in the thickness direction of the wall portion to not exceed the first surface of the wall portion away from the electrode assembly, the valve body does not protrude from the first surface in the thickness direction of the wall portion. On the one hand, it can save the space occupied by the battery cell in the thickness direction of the wall portion, and on the other hand, it can reduce the phenomenon of wear or collision between the valve body and the external environment, which is conducive to improving the protection of the valve body and thus extending the service life of the one-way valve.

[0023] In some embodiments, the valve cover is connected to the wall portion, and the vent is a second venting gap formed between the valve cover and the wall portion.

[0024] In the above technical solution, by connecting the valve cover to the wall and the air outlet of the valve body being the second exhaust gap between the valve cover and the wall, the battery cell with this structure can, on the one hand, expand the space of the mounting cavity formed between the valve cover and the valve body to improve the exhaust efficiency and smoothness of the one-way valve, and on the other hand, directly form the air outlet of the one-way valve between the valve cover and the wall, which helps to reduce the phenomenon of the air outlet being blocked by other components of the battery cell.

[0025] In some embodiments, the valve body is integrally formed with the wall portion.

[0026] In the above technical solution, by setting the valve body and the wall portion of the valve body as an integrally formed structure, it is beneficial to improve the structural stability and structural strength of the valve body set on the wall portion.

[0027] In some embodiments, the valve core includes an elastic element and a sealing element; the elastic element is disposed within the mounting cavity; the sealing element is movably disposed within the mounting cavity, and the sealing element is used to block the air inlet under the action of the elastic element, and to open the air inlet under the action of the gas inside the housing.

[0028] In the above technical solution, the valve core of the one-way valve is provided with an elastic element and a blocking element, and both the elastic element and the blocking element are disposed in the mounting cavity. This allows the elastic element to apply an elastic force to the blocking element, so that the blocking element can block the air inlet and prevent gas outside 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 blocking element and overcome the elastic force of the elastic element, so that the blocking element can open the air inlet. This allows the gas inside the housing to be discharged through the one-way valve, so that the one-way valve can discharge the gas inside the housing to the outside of the housing and prevent the gas outside the housing from entering the interior of the housing.

[0029] In some embodiments, the elastic element is a spring.

[0030] In the above technical solution, a spring is used as an elastic element set in the installation cavity. On the one hand, it is convenient to assemble the elastic element, which helps to reduce the difficulty of assembling the elastic element in the installation cavity. On the other hand, it can make the direction of the elastic force applied by the elastic element to the sealing element more stable.

[0031] In some embodiments, the elastic element is made of steel, iron, or aluminum.

[0032] In the above technical solutions, elastic components made of steel, iron, or aluminum have good toughness and can alleviate the phenomenon of elastic failure, which is beneficial to improving the service life of the elastic components.

[0033] In some embodiments, the valve cover and the sealing member are spaced apart along the thickness direction of the wall portion, the two ends of the elastic member abut against the valve cover and the sealing member respectively, and the air inlet is disposed on the bottom surface of the mounting cavity.

[0034] In the above technical solution, by setting the valve cover and the sealing element to be arranged at intervals along the thickness direction of the wall, the two ends of the elastic element can abut against the valve cover and the sealing element respectively, so that the sealing element can block the air inlet on the bottom surface of the mounting cavity along the thickness direction of the wall under the action of the elastic element. That is, the air inlet is located at the end of the valve body facing the electrode assembly in the thickness direction of the wall. The sealing element can move along the thickness direction of the wall and block the air inlet under the action of the elastic element. The one-way valve with this structure makes it easy for the elastic element to apply elastic force to the sealing element so that the sealing element blocks the air inlet, and can reduce the assembly difficulty of the elastic element.

[0035] In some embodiments, a first guide post protrudes from the side of the valve cover facing the sealing member, and a portion of the elastic member is sleeved on the outside of the first guide post.

[0036] In the above technical solution, by protruding a first guide post on the side of the valve cover facing the sealing member, and partially sleeved on the outside of the first guide post, the one-way valve with this structure can, on the one hand, use the first guide post to position the elastic member, so as to facilitate the assembly of the elastic member and reduce the assembly difficulty of the elastic member. On the other hand, the first guide post can guide the elastic member when it is compressed along the thickness direction of the wall, so as to reduce the radial deformation of the elastic member during the compression process. This can achieve stable compression of the elastic member along the thickness direction of the wall, which can improve the reliability of the elastic member and reduce the risk of the sealing member accidentally opening the air inlet.

[0037] In some embodiments, the valve cover is connected to the valve body, and the air outlet is a first through hole provided on the valve cover; wherein, along the thickness direction of the wall portion, the air outlet penetrates the first guide post; or, along the radial direction of the first guide post, the air outlet is arranged at intervals with the first guide post.

[0038] In the above technical solution, by setting the air outlet as a first through hole on the valve cover, and the first through hole penetrating the first guide post along the thickness direction of the wall, the air outlet is located inside the elastic element, which helps to reduce the interference effect of the air outlet on the connection between the valve cover and the valve body. Similarly, by setting the air outlet as a first through hole on the valve cover, and the air outlet being located outside the first guide post, it is beneficial to the discharge of gas, thereby reducing the phenomenon of the air outlet being blocked by the sealing element.

[0039] In some embodiments, the diameter of the first guide post is D1, and the inner diameter of the elastic element is D2, satisfying that 0mm < D2 - D1 ≤ 5mm.

[0040] In the above technical solution, by setting the difference between the inner diameter of the elastic element and the diameter of the first guide post to be greater than 0 mm and less than or equal to 5 mm, on the one hand, it can alleviate the phenomenon that the elastic element is not easy to assemble on the first guide post because the difference between the inner diameter of the elastic element and the diameter of the first guide post is less than or equal to 0, so as to reduce the phenomenon of scraping during the process of the elastic element being fitted on the first guide post. On the other hand, it can alleviate the phenomenon that the gap between the elastic element and the first guide post is too large because the difference between the inner diameter of the elastic element and the diameter of the first guide post is too large, so as to reduce the situation of radial movement or radial deformation of the elastic element, thereby improving the balance of the elastic force of the elastic element acting on the sealing element, so as to reduce the risk of the sealing element accidentally opening the air inlet.

[0041] In some embodiments, a first limiting groove is provided on the side of the valve cover facing the sealing member, and the end of the elastic member away from the sealing member is inserted into the first limiting groove.

[0042] In the above technical solution, a first limiting groove is provided on the side of the valve cover facing the sealing component for the insertion of the elastic component. This groove can limit the end of the elastic component that abuts against the valve cover, thereby reducing the phenomenon of relative radial slippage between the elastic component and the valve cover. This can improve the balance of the elastic force exerted by the elastic component on the sealing component and improve the reliability of the elastic component.

[0043] In some embodiments, the end of the elastic member away from the sealing member is fixedly connected to the valve cover.

[0044] In the above technical solution, by fixing the end of the elastic element away from the sealing element to the valve cover, the end of the elastic element that abuts against the valve cover is fixedly connected to the valve cover. This improves the stability of the elastic element against the valve cover, further reduces the phenomenon of relative slippage between the elastic element and the valve cover, and further improves the balance of the elastic force exerted by the elastic element on the sealing element.

[0045] In some embodiments, a second guide post protrudes from the side of the sealing member facing the valve cover, and a portion of the elastic member is sleeved on the outside of the second guide post.

[0046] In the above technical solution, by protruding a second guide post on the side of the sealing component facing the valve cover, and partially sleeved on the outside of the second guide post, the one-way valve with this structure can, on the one hand, use the second guide post to position the elastic component, which facilitates the assembly of the elastic component and reduces the assembly difficulty of the elastic component. On the other hand, the second guide post can guide the elastic component when it is compressed along the thickness direction of the wall, thereby reducing the radial deformation of the elastic component during compression. This enables the elastic component to be stably compressed along the thickness direction of the wall, which helps to improve the reliability of the elastic component and reduces the risk of the sealing component accidentally opening the air inlet.

[0047] In some embodiments, the diameter of the second guide post is D3, and the inner diameter of the elastic element is D2, satisfying that 0mm < D3 - D1 ≤ 5mm.

[0048] In the above technical solution, by setting the difference between the inner diameter of the elastic element and the diameter of the second guide post to be greater than 0 mm and less than or equal to 5 mm, on the one hand, it can alleviate the phenomenon that the elastic element is not easy to assemble on the second guide post due to the difference between the inner diameter of the elastic element and the diameter of the second guide post being less than or equal to 0, so as to reduce the phenomenon of scraping during the process of the elastic element being fitted on the second guide post. On the other hand, it can alleviate the phenomenon that the gap between the elastic element and the second guide post is too large due to the difference between the inner diameter of the elastic element and the diameter of the second guide post being too large, so as to reduce the situation of radial movement or radial deformation of the elastic element, thereby improving the balance of the elastic force of the elastic element acting on the sealing element, so as to reduce the risk of the sealing element accidentally opening the air inlet.

[0049] In some embodiments, the sealing member has a second limiting groove on the side facing the valve cover, and the end of the elastic member away from the valve cover is inserted into the second limiting groove.

[0050] In the above technical solution, by providing a second limiting groove for the insertion of the elastic element on the side of the sealing element facing the valve cover, the end of the elastic element that abuts against the sealing element can be limited, thereby reducing the phenomenon of relative radial slippage between the elastic element and the sealing element. This can improve the balance of the elastic force exerted by the elastic element on the sealing element, which is beneficial to improving the reliability of the elastic element.

[0051] In some embodiments, the end of the elastic element away from the valve cover is fixedly connected to the sealing element.

[0052] In the above technical solution, by fixing the end of the elastic element away from the valve cover to the sealing element, the end of the elastic element that abuts against the sealing element and the sealing element are fixedly connected to each other. This can improve the stability of the elastic element against the sealing element, further reduce the phenomenon of relative slippage between the elastic element and the sealing element, and further improve the balance of the elastic force of the elastic element acting on the sealing element.

[0053] In some embodiments, the sealing member is spaced apart from the cavity side of the mounting cavity.

[0054] In the above technical solution, by setting the sealing element and the cavity side of the mounting cavity at intervals, the scraping between the sealing element and the cavity side of the mounting cavity can be reduced when the sealing element opens or blocks the air inlet along the thickness direction of the wall. This reduces the phenomenon of the sealing element getting stuck or moving unevenly, which is beneficial to improving the reliability of the one-way valve.

[0055] In some embodiments, the outer peripheral surface of the sealing member is provided with a plurality of limiting protrusions, the plurality of limiting protrusions being arranged at intervals along the circumference of the sealing member, and the limiting protrusions being guided and engaged with the cavity side surface of the mounting cavity.

[0056] In the above technical solution, multiple limiting protrusions are provided on the outer peripheral surface of the sealing component at intervals, and the limiting protrusions are guided and cooperate with the cavity side of the mounting cavity. Thus, when the sealing component moves along the thickness direction of the wall, the cooperation between the limiting protrusions and the cavity side of the mounting cavity can provide guidance and limitation, thereby improving the stability of the sealing component moving along the thickness direction of the wall.

[0057] In some embodiments, the sealing member includes a pressing part and a sealing part. Along the thickness direction of the wall, the two ends of the elastic member abut against the valve cover and the pressing part, respectively. The sealing part is connected to the side of the pressing part away from the valve cover and is used to block the air inlet.

[0058] In the above technical solution, by setting the sealing component to include two parts, a pressing part and a sealing part, the pressing part is set on the side of the sealing part facing the valve cover, the sealing part is used to block the air inlet, and the two ends of the elastic element abut against the valve cover and the pressing part respectively, so that the elastic element can apply elastic force to the sealing part through the pressing part, thereby improving the balance of the elastic force applied by the elastic element to the sealing part, and thus effectively improving the sealing effect of the sealing part on the air inlet.

[0059] In some embodiments, the pressing part has a first abutting surface facing the sealing part, and the sealing part has a second abutting surface facing the pressing part. One of the first abutting surface and the second abutting surface is provided with a snap-fit ​​groove, and the other is provided with a snap-fit ​​part, which engages with the snap-fit ​​groove.

[0060] In the above technical solution, the pressing part and the sealing part have a first abutting surface and a second abutting surface facing each other. By providing a snap-fit ​​groove on one of the first abutting surface and the second abutting surface, and providing a snap-fit ​​part on the other surface that snaps into the snap-fit ​​groove, the structural stability of the sealing part on the pressing part can be improved, thereby reducing the radial slippage of the sealing part relative to the pressing part. This is beneficial to improving the sealing effect of the sealing part on the air inlet, thereby reducing the phenomenon of the air inlet being accidentally opened.

[0061] In some embodiments, the sealing portion is adhered to the clamping portion.

[0062] In the above technical solution, the sealing part and the pressing part are connected by an adhesive structure. On the one hand, it can improve the structural stability of the sealing part connected to the pressing part, which helps to reduce the risk of the sealing part and the pressing part separating from each other, thereby improving the reliability of the sealing part in blocking the air inlet. On the other hand, it facilitates the assembly connection between the sealing part and the pressing part, which helps to reduce the assembly difficulty between the sealing part and the pressing part.

[0063] In some embodiments, the material of the sealing part includes EPDM, fluororubber, or Teflon.

[0064] In the above technical solution, the sealing part made of EPDM, fluororubber or Teflon has good corrosion resistance, which can effectively alleviate the phenomenon of the sealing part being corroded by electrolyte, thereby helping to improve the service life of the sealing part, and can reduce the phenomenon of poor sealing effect of the sealing part blocking the air inlet due to corrosion of the sealing part.

[0065] In some embodiments, the gap between the valve cover and the sealing member along the thickness direction of the wall is L, satisfying that 0mm < L ≤ 2mm.

[0066] In the above technical solution, by setting the gap between the valve cover and the sealing component in the thickness direction of the wall to be greater than 0 mm and less than or equal to 2 mm, on the one hand, the obstruction of the valve cover to the sealing component can be reduced, so that there is space between the valve cover and the sealing component for the sealing component to move along the thickness direction of the wall. Thus, when the gas inside the shell pushes the sealing component, the sealing component can open the air inlet to exhaust gas. On the other hand, it can alleviate the phenomenon that the one-way valve occupies too much space in the thickness direction of the wall due to the excessive gap between the valve cover and the sealing component, thereby helping to improve the space utilization rate of the battery cell.

[0067] In some embodiments, the valve body is welded to the wall.

[0068] In the above technical solution, welding the valve body to the wall can effectively improve the structural stability and strength of the valve body connected to the wall, thereby reducing the risk of the valve body falling off during use.

[0069] In some embodiments, the wall portion is provided with a mounting hole, at least a portion of the valve body is accommodated within the mounting hole, the wall surface of the mounting hole includes a first connecting surface, the valve body includes a second connecting surface, the first connecting surface and the second connecting surface are both arranged around the central axis of the mounting hole, and the first connecting surface and the second connecting surface are welded together.

[0070] In the above technical solution, the wall is provided with a valve body mounting hole for accommodating the valve body, and the valve body has a second connecting surface. The second connecting surface is welded to the first connecting surface of the mounting hole wall to realize the one-way valve assembly onto the wall. The structure of welding the first connecting surface and the second connecting surface, which are both annular, can improve the connection reliability between the valve body and the wall and improve the sealing effect between the valve body and the mounting hole wall.

[0071] In some embodiments, the first connecting surface and the second connecting surface are fitted together, and both the first connecting surface and the second connecting surface are set at an acute angle to the central axis of the mounting hole.

[0072] In the above technical solution, by setting the first connecting surface and the second connecting surface to fit each other, and both the first connecting surface and the second connecting surface are set at an acute angle to the central axis of the mounting hole, the first connecting surface and the second connecting surface have the same shape and abut against each other. Furthermore, both the first connecting surface and the second connecting surface are inclined structures, which facilitates the abutment of the first connecting surface and the second connecting surface when the valve body is assembled into the mounting hole. This also improves the tightness of the fit between the first connecting surface and the second connecting surface, helps to reduce the gap between the first connecting surface and the second connecting surface, and thus effectively improves the welding quality of the first connecting surface and the second connecting surface.

[0073] In some embodiments, the mounting hole includes a first hole segment and a second hole segment, the first hole segment and the second hole segment are arranged along the thickness direction of the wall portion, and the first hole segment is located on the side of the second hole segment away from the electrode assembly, the diameter of the first hole segment is larger than the diameter of the second hole segment; wherein, the hole wall surface of the first hole segment is the first connecting surface, the valve body has a connecting portion located in the first hole segment, and the outer peripheral surface of the connecting portion is the second connecting surface.

[0074] In the above technical solution, the mounting hole is provided with a first hole segment and a second hole segment arranged along the thickness direction of the wall. The first hole segment is located on the outside of the second hole segment away from the electrode assembly, and the diameter of the first hole segment is larger than that of the second hole segment to form a stepped hole structure mounting hole. By setting the hole wall surface of the first hole segment as the first connecting surface, and the valve body having a connecting part accommodated in the first hole segment, and the outer peripheral surface of the connecting part being the second connecting surface, it is convenient to assemble the valve body of the one-way valve from the outside of the wall into the mounting hole. After the connecting part of the valve body is accommodated in the first hole segment, the first connecting surface can abut against the second connecting surface. Thus, the stepped hole structure mounting hole and the connecting part can cooperate to play a certain limiting and positioning role for the valve body, which helps to reduce the difficulty of assembling the valve body into the mounting hole.

[0075] In some embodiments, along the thickness direction of the wall portion, the end face of the valve body opposite to the electrode assembly is connected to the second connecting surface, and a first stress relief groove is provided on the end face of the valve body opposite to the electrode assembly.

[0076] In the above technical solution, by providing a first stress relief groove on the end face of the valve body away from the electrode assembly along the thickness direction of the wall, the welding stress generated by the welding of the first connecting surface and the second connecting surface can be released through the first stress relief groove, thereby reducing the influence of welding stress on the weld connecting the first connecting surface and the second connecting surface, reducing the risk of weld cracking, and thus reducing the risk of seal failure at the weld.

[0077] In some embodiments, the first stress relief groove is disposed around the central axis of the mounting hole.

[0078] In the above technical solution, by setting the first stress relief groove as an annular structure surrounding the central axis of the mounting hole, it is beneficial to improve the absorption effect of the first stress relief groove on the welding stress generated by the welding of the first connecting surface and the second connecting surface of the annular structure, so as to further reduce the impact of welding stress on the valve core and other components of the one-way valve.

[0079] In some embodiments, the battery cell further includes an insulating member disposed on the side of the wall facing the electrode assembly; wherein, along the thickness direction of the wall, the wall has a second surface facing the electrode assembly, the one-way valve protrudes from the second surface, the insulating member includes a body portion and a receiving portion, the body portion being disposed on the side of the wall facing the electrode assembly, the receiving portion being connected to the body portion, and the portion of the one-way valve extending into the housing being received within the receiving portion.

[0080] In the above technical solution, the battery cell is also provided with an insulating component. The insulating component includes a body portion and a receiving portion that are connected to each other. The body portion is located on the side of the wall portion facing the electrode assembly, so that the wall portion and the electrode assembly can be insulated and isolated through the body portion. The receiving portion accommodates the part of the one-way valve that protrudes from the second surface of the wall portion, which can avoid and protect the one-way valve. It can also insulate and isolate the electrode assembly and the one-way valve, thereby reducing the risk of short circuit between the one-way valve and the electrode assembly.

[0081] In some embodiments, the one-way valve includes a valve body that protrudes from the second surface along the thickness direction of the wall portion, and the portion of the valve body protruding from the second surface is provided with an air inlet, the air inlet being configured to allow gas inside the housing to be discharged; wherein, the receiving portion is provided with a second through hole, the second through hole communicating with the air inlet.

[0082] In the above technical solution, by providing a second through hole on the receiving part, the second through hole can connect the inside of the outer shell and the inside of the receiving part, so that the air inlet of the valve body of the one-way valve can be connected to the inside of the outer shell through the second through hole. This allows the gas inside the outer shell to enter the receiving part through the second through hole and then be discharged to the outside of the outer shell through the one-way valve. This eliminates the need for the gas to enter the receiving part through the gap between the body part and the wall part and then be discharged through the one-way valve, which helps to improve the smoothness of the one-way valve in discharging the gas inside the outer shell.

[0083] In some embodiments, along the thickness direction of the wall portion, the air inlet is disposed at one end of the valve body facing the electrode assembly; the receiving portion includes a first wall and a second wall, the first wall surrounds the valve body, one end of the first wall is connected to the body portion along the thickness direction of the wall portion, and the second wall is connected to the end of the first wall away from the body portion; wherein, the second through hole is disposed in the first wall and / or the second wall.

[0084] In the above technical solution, the receiving part is provided with a first wall and a second wall that are connected to each other. The first wall surrounds the valve body, and the second wall is located at the end of the valve body facing the electrode assembly in the thickness direction of the wall portion, so that the first wall and the second wall together form a receiving part for accommodating the portion of the valve body extending into the housing. By setting the second through hole of the receiving part on the first wall, it is beneficial to increase the path of gas from the second through hole into the air inlet of the valve body, so as to alleviate the phenomenon of electrolyte overflowing with gas. By setting the second through hole of the receiving part on the second wall, it is beneficial to realize that the air inlet and the second through hole are correspondingly set, so as to improve the smoothness of the one-way valve discharging gas into the housing.

[0085] In some embodiments, the receiving portion is integrally formed with the body portion.

[0086] In the above technical solution, by setting the body and the receiving part of the insulating component as an integrally formed structure, it is beneficial to improve the structural strength and structural stability of the receiving part connected to the body.

[0087] In some embodiments, the receiving portion is separately disposed from the body portion.

[0088] In the above technical solution, by setting the body and the receiving part of the insulating component as separate structures, it is beneficial to reduce the processing difficulty of the insulating component and thus reduce the manufacturing cost of the insulating component.

[0089] In some embodiments, the receiving portion further includes a flanged portion; the flanged portion is connected to the end of the first wall away from the second wall, at least a portion of the flanged portion is stacked with the body portion, and the flanged portion abuts against the side of the body portion facing the wall portion.

[0090] In the above technical solution, the receiving part is also provided with a flange. By connecting the flange to the end of the first wall away from the second wall, at least a portion of the flange is stacked with the main body in the thickness direction of the wall, and the flange abuts against the side of the main body facing the wall, so that the receiving part is connected to the main body. The structure is simple and easy to assemble.

[0091] In some embodiments, along the thickness direction of the wall portion, the surface of the body portion facing the wall portion is provided with a receiving groove, and the flange portion is received in the receiving groove.

[0092] In the above technical solution, by providing a receiving groove for accommodating the flange on the surface of the body facing the wall, the space occupied by the flange and the body in the thickness direction of the wall can be reduced, and the interference caused by the flange to the body and the wall abutting each other can be reduced.

[0093] In some embodiments, along the thickness direction of the wall portion, the surface of the flange portion facing the wall portion is flush with the surface of the body portion facing the wall portion.

[0094] In the above technical solution, by setting the surface of the flange facing the wall and the surface of the body facing the wall to be flush with each other, the bottom surface of the wall and the receiving groove can cooperate to clamp and limit the flange, thereby reducing the phenomenon of the receiving part moving along the thickness direction of the wall.

[0095] In some embodiments, the battery cell further includes a shielding member; the shielding member is mounted on the wall portion, and along the thickness direction of the wall portion, the shielding member is located on the side of the one-way valve away from the electrode assembly, and the shielding member covers the one-way valve; wherein, the one-way valve has an outlet for discharging gas from inside the housing, and an exhaust channel is formed between the shielding member and the wall portion or an exhaust channel is provided on the shielding member, the exhaust channel connecting the outlet and the outside of the housing.

[0096] In the above technical solution, the battery cell is also provided with a shielding component located on the side of the one-way valve away from the electrode assembly. The shielding component is installed on the wall and covers the one-way valve. Thus, the shielding component can provide a certain degree of protection and shielding for the one-way valve. On the one hand, it can reduce the wear or damage of the one-way valve in the external environment and reduce the risk of impurities or particles in the external environment entering the one-way valve, which is conducive to improving the service life of the one-way valve. On the other hand, covering the one-way valve with the shielding component can improve the aesthetics of the outer surface of the battery cell. Furthermore, it is convenient to connect detection elements and other components on the side of the shielding component away from the one-way valve, so as to reduce the interference of the area of ​​the wall where the one-way valve is located on the connection of detection elements and other components.

[0097] 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.

[0098] 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.

[0099] In some embodiments, the exhaust passage includes a third exhaust gap formed between the shield and the side of the mounting groove, the third exhaust gap being used to connect the exhaust port and the outside of the housing.

[0100] In the above technical solution, by forming a third exhaust gap that communicates with the outside of the housing between the shield and the side of the mounting groove, the gas discharged by the one-way valve can be discharged to the outside of the housing through the third exhaust gap. With this structure, the battery cell does not need to have a channel opened on the shield, which helps to reduce the processing difficulty and improves the aesthetics of the battery cell.

[0101] In some embodiments, the outer peripheral surface of the shielding member includes a first corner surface and at least two first side surfaces, the first corner surface connecting two adjacent first side surfaces; the groove side surface of the mounting groove includes a second corner surface and at least two second side surfaces, the second corner surface connecting two adjacent second side surfaces, each second side surface connecting to one first side surface, and the third exhaust gap being formed between the second corner surface and the first corner surface.

[0102] In the above technical solution, two adjacent first side surfaces on the outer periphery of the shielding member are connected by a first corner surface, and two connected second side surfaces on the side surface of the mounting groove are connected by a second corner surface. Each first side surface is connected to a second side surface, and a third gap is formed between the first corner surface and the second corner surface. That is to say, a third venting gap is formed at the corner of the shielding member and the mounting groove. On the one hand, this facilitates the formation of a third venting gap between the outer periphery of the shielding member and the side surface of the mounting groove, which is simple in structure and easy to implement. On the other hand, while forming a third venting gap between the outer periphery of the shielding member and the side surface of the mounting groove, it also helps to increase the connection area between the outer periphery of the shielding member and the side surface of the mounting groove, which helps to improve the firmness of the shielding member connected to the wall.

[0103] In some embodiments, both the first corner surface and the second corner surface are arc surfaces, and the radius of the first corner surface is greater than the radius of the second corner surface.

[0104] In the above technical solution, by setting both the first corner surface and the second corner surface as arc surfaces, and the radius of the first corner surface is greater than the radius of the second corner surface, a third exhaust gap is formed between the first corner surface and the second corner surface. The structure is simple and easy to manufacture and process.

[0105] In some embodiments, the first side and the second side are welded together.

[0106] In the above technical solution, by setting the first side and the second side as a structure that is welded to each other, it is beneficial to improve the connection between the shielding member and the side of the mounting groove, thereby improving the structural stability of the shielding member assembled onto the wall.

[0107] In some embodiments, the shielding member has a rectangular cross-section in the direction perpendicular to the thickness of the wall portion, and the outer peripheral surface of the shielding member includes four first side surfaces and four first corner surfaces, with the third exhaust gap formed at at least one first corner surface.

[0108] In the above technical solution, by setting the shielding member as a rectangular plate structure, the four sides of the shielding member form four first side surfaces, and four first corner surfaces are formed at the four right angles of the shielding member. The structure is simple and easy to manufacture.

[0109] In some embodiments, the exhaust passage further includes a fourth exhaust gap, which is formed between the shield and the bottom surface of the mounting groove, and the fourth exhaust gap connects the third exhaust gap and the air outlet.

[0110] In the above technical solution, the exhaust channel also includes a fourth exhaust gap formed between the shield and the bottom surface of the mounting groove, and the fourth exhaust gap connects the third exhaust gap and the outlet to alleviate the phenomenon of exhaust obstruction between the outlet and the third exhaust gap caused by the shield abutting against the bottom surface of the mounting groove, thereby improving the smoothness of gas discharge from the outlet of the one-way valve to the third exhaust gap.

[0111] In some embodiments, along the thickness direction of the wall portion, the shielding member has a third surface facing the one-way valve, the third surface overlapping the bottom surface of the mounting groove, the third surface being provided with a first groove, and the fourth exhaust gap being formed between the bottom surface of the first groove and the bottom surface of the mounting groove.

[0112] In the above technical solution, by overlapping the third surface of the shielding member with the bottom surface of the mounting groove, the shielding member abuts against the bottom surface of the mounting groove, thereby improving the structural stability and reliability of the shielding member installed in the mounting groove. In addition, by setting a first groove on the third surface, a fourth exhaust gap is formed between the bottom surface of the first groove and the bottom surface of the mounting groove, so that the gas discharged from the outlet of the one-way valve can enter the third exhaust gap through the first groove and then be discharged to the outside of the housing. Thus, while the shielding member abuts against the bottom surface of the mounting groove, the third exhaust gap and the outlet can be connected through the first groove.

[0113] In some embodiments, a plurality of third vent gaps are formed between the shielding member and the side of the mounting groove, the plurality of third vent gaps are arranged at intervals along the circumference of the shielding member, a plurality of first grooves are provided on the third surface, and each third vent gap communicates with a first groove.

[0114] In the above technical solution, by forming multiple third exhaust gaps between the shield and the side of the mounting groove, and each third exhaust gap communicating with a first groove, it is beneficial to further improve exhaust efficiency.

[0115] In some embodiments, the third surface is further provided with a second groove, and a plurality of first grooves are disposed around the second groove and are all in communication with the second groove, and the second groove is in communication with the air outlet.

[0116] In the above technical solution, by setting a second groove on the third surface of the shield facing the one-way valve, the second groove is connected to the outlet of the one-way valve, and multiple first grooves are arranged around the second groove and are all connected to the second groove, so that the gas discharged from the outlet of the one-way valve can enter the second groove and then pass through the multiple first grooves and then through the corresponding third exhaust gaps to be discharged to the outside of the housing, which is beneficial to improve exhaust efficiency and can alleviate the phenomenon of gas accumulation between the shield and the one-way valve.

[0117] In some embodiments, along the thickness direction of the wall portion, the air outlet is disposed at one end of the one-way valve away from the electrode assembly, the air outlet faces the second groove, and the projection of the air outlet is located within the second groove.

[0118] In the above technical solution, by setting the outlet of the one-way valve and the second groove to face each other, and the projection of the outlet in the thickness direction of the wall is located in the second groove, the second groove is a structure that covers the outlet in the thickness direction of the wall, so that the gas discharged from the outlet of the one-way valve can directly enter the second groove, which is beneficial to improving the exhaust smoothness and exhaust efficiency.

[0119] In some embodiments, the shielding member does not extend beyond the first surface along the thickness direction of the wall portion.

[0120] 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.

[0121] In some embodiments, the shielding member has a fourth surface facing away from the one-way valve, the fourth surface being flush with the first surface.

[0122] In the above technical solution, by setting the fourth surface of the shielding member away from the one-way valve and the first surface of the wall away from the electrode assembly to be flush with each other, it is beneficial to further improve the aesthetics of the outer surface of the battery cell, and it is also convenient to set information codes or connect detection elements and other components on the fourth surface of the shielding member.

[0123] In some embodiments, the shielding member is fixedly connected to the wall portion.

[0124] In the above technical solution, by setting the shielding component to be fixedly connected to the wall, it is beneficial to reduce the risk of the shielding component detaching from the wall during use, and to improve the connection between the shielding component and the wall, so as to set information codes or connect detection elements and other components on the shielding component.

[0125] In some embodiments, the battery cell further includes a protective patch; the protective patch is disposed on the side of the wall portion away from the electrode assembly, and the protective patch is provided with an information acquisition hole penetrating the protective patch, the projection of the information acquisition hole in the thickness direction of the wall portion being located within the shielding member.

[0126] In the above technical solution, the battery cell is also equipped with a protective patch. By setting the protective patch on the side of the wall away from the electrode assembly, the wall can be protected. In addition, by setting an information acquisition hole on the protective patch, and the projection of the information acquisition hole in the thickness direction of the wall is located inside the shielding member, the structure of the information acquisition hole corresponding to the shielding member is made so that the information acquisition hole is set on the shielding member. On the one hand, it is convenient to set information codes or connect components such as detection elements for sampling on the shielding member, so as to reduce the damage and pulling of the one-way valve by the sampling detection elements and other components. On the other hand, it can improve the aesthetics of the outer surface of the battery cell. Furthermore, by setting the shielding member and the information acquisition hole of the protective patch to correspond, the area of ​​the battery cell that is vented through the one-way valve can be set to correspond to the area of ​​the information acquisition hole on the protective patch. This can save the space occupied by the information acquisition hole and the shielding member on the outer surface of the casing, which is conducive to improving the integration of the battery cell.

[0127] In some embodiments, one end of the exhaust channel is formed with an exhaust port communicating with the outside of the housing, and the protective patch covers the exhaust port.

[0128] In the above technical solution, by setting the protective patch to cover the exhaust port at one end of the exhaust channel formed between the shield and the wall, it can, on the one hand, shield the exhaust channel to improve the aesthetics of the outer surface of the battery cell, and on the other hand, reduce the risk of impurities or particulate matter in the external environment entering the exhaust channel through the exhaust port and blocking the exhaust channel, which is conducive to improving the reliability of the battery cell.

[0129] 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 exhaust port are both located within the first clearance hole.

[0130] 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. In addition, by providing a first clearance hole at the position of the adhesive layer corresponding to the information acquisition hole, and the projection of the information acquisition hole of the protective patch and the exhaust port formed at one end of the exhaust channel in the thickness direction of the wall are both located in the first clearance hole, the obstruction of the exhaust port of the exhaust channel by the adhesive layer is reduced. This allows the gas discharged through the exhaust channel to enter the information acquisition hole through the gap between the protective patch and the wall and then be discharged. Thus, while achieving adhesion of the protective patch to the wall, the impact on the exhaust of the one-way valve is reduced.

[0131] In some embodiments, one end of the exhaust channel is formed with an exhaust port communicating with the outside of the housing; the battery cell further includes a protective patch disposed on the side of the wall opposite to the electrode assembly, the protective patch covering the exhaust port.

[0132] In the above technical solution, by setting a protective patch on the side of the wall away from the electrode assembly, and the protective patch covering the exhaust port at one end of the exhaust channel formed between the shield and the wall, the exhaust channel can be shielded to improve the aesthetics of the outer surface of the battery cell. On the other hand, it can reduce the risk of impurities or particles in the external environment entering the exhaust channel through the exhaust port and blocking the exhaust channel, which is beneficial to improving the reliability of the battery cell.

[0133] In some embodiments, the wall portion is provided with a mounting hole, and at least a portion of the one-way valve is mounted in the mounting hole, which is the liquid injection hole of the battery cell.

[0134] In the above technical solution, by setting the mounting hole of the one-way valve as the liquid injection hole, liquid can be injected into the housing through the mounting hole before assembling the one-way valve in the mounting hole, so that there is no need to open a separate liquid injection hole on the housing. This is beneficial to improving the production efficiency of battery cells and reducing the manufacturing cost of battery cells.

[0135] 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.

[0136] In the above technical solution, by setting the wall of the outer casing as an end cap for sealing the opening of the casing, the battery cell with this structure facilitates the installation of a one-way valve on the end cap, which helps reduce the assembly difficulty of the battery cell and improves the production efficiency of the battery cell. Similarly, by setting the wall of the outer casing as one wall of the casing, the battery cell with this structure can reduce the impact of stress generated when the end cap and the casing are connected on the one-way valve, thereby mitigating the damage to the one-way valve and improving the stability and service life of the battery cell.

[0137] In some embodiments, the battery cell further includes a pressure relief mechanism; the pressure relief mechanism is disposed in the housing and is configured to actuate and release the internal pressure of the battery cell in the event of thermal runaway of the battery cell, wherein the actuation pressure of the pressure relief mechanism is greater than the opening pressure of the one-way valve.

[0138] In the above technical solution, by setting the opening pressure of the one-way valve to release gas to be less than the actuation pressure of the pressure relief mechanism, when gas is generated inside the casing during normal use of the battery cell, it can be discharged to the outside of the casing through the one-way valve. This alleviates the phenomenon that the pressure relief mechanism will prematurely actuate and release pressure before the battery cell thermal runaway due to the rise in internal gas pressure. In this way, the stability of the battery cell can be effectively improved, thereby increasing the service life and reliability of the battery cell.

[0139] In some embodiments, the exhaust rate of the one-way valve is less than the exhaust rate of the pressure relief mechanism.

[0140] In the above technical solution, by setting the exhaust rate of the one-way valve to be less than the exhaust rate of the pressure relief mechanism, the phenomenon that the pressure relief mechanism cannot be actuated and opened due to excessive exhaust of the one-way valve when the battery cell experiences thermal runaway can be alleviated. This allows the pressure relief mechanism to be actuated and stably release the internal pressure of the battery cell when the battery cell experiences thermal runaway, thereby helping to reduce the risk of fire and explosion of the battery cell during thermal runaway.

[0141] In some embodiments, along the thickness direction of the wall portion, the wall portion has a second surface facing the electrode assembly, and the one-way valve protrudes from the second surface; the battery cell further includes an electrode terminal and a current collector, the electrode terminal being mounted on the wall portion and used for outputting or inputting electrical energy of the battery cell, the current collector connecting the electrode terminal and the electrode assembly, and at least a portion of the current collector being disposed between the wall portion and the electrode assembly; wherein, the current collector is provided with a clearance groove, and the one-way valve extends into the clearance groove along the thickness direction of the wall portion.

[0142] In the above technical solution, the battery cell is also provided with electrode terminals for inputting or outputting electrical energy, and the current collector connects the electrode assembly and the electrode terminals, thereby reducing the difficulty of connecting the electrode assembly and the electrode terminals. Furthermore, by providing a clearance groove on the current collector, and having the one-way valve extend into the clearance groove in the thickness direction of the wall, the current collector can avoid interference with the one-way valve, reducing interference between them. This also saves space occupied by the one-way valve and the current collector inside the casing, which is beneficial for improving the energy density of the battery cell.

[0143] Secondly, embodiments of this application also provide a battery, including the aforementioned battery cell.

[0144] 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

[0145] 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.

[0146] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0147] Figure 2 Exploded views of the battery structure provided in some embodiments of this application;

[0148] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0149] Figure 4 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0150] Figure 5 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0151] Figure 6 This is a schematic diagram of the structure of a one-way valve provided in some embodiments of this application;

[0152] Figure 7 Exploded views of the structure of a one-way valve provided in some embodiments of this application;

[0153] Figure 8 A cross-sectional view of a check valve provided in some embodiments of this application;

[0154] Figure 9 Schematic diagram of the structure of a check valve provided in some embodiments of this application;

[0155] Figure 10 A partial cross-sectional view of a battery cell provided for some embodiments of this application;

[0156] Figure 11 This is a schematic diagram of the structure of a check valve provided in some embodiments of this application;

[0157] Figure 12 A cross-sectional view of a check valve provided in some embodiments of this application;

[0158] Figure 13 A cross-sectional view of a check valve provided for other embodiments of this application;

[0159] Figure 14 A cross-sectional view of a check valve provided for further embodiments of this application;

[0160] Figure 15 A schematic diagram of the sealing component of a one-way valve provided in some further embodiments of this application;

[0161] Figure 16 A partial cross-sectional view of the wall of the casing of a battery cell provided in some embodiments of this application;

[0162] Figure 17 A partial cross-sectional view of the insulating component of a battery cell provided in some embodiments of this application;

[0163] Figure 18 A partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0164] Figure 19 A partial cross-sectional view of the insulating component of a battery cell provided in some embodiments of this application;

[0165] Figure 20 A top view of a battery cell (after removing the protective patch) provided in some embodiments of this application;

[0166] Figure 21 for Figure 20 A magnified view of part A of the shown battery cell;

[0167] Figure 22 A schematic diagram showing the connection between the shielding member and the wall of a battery cell provided in some embodiments of this application;

[0168] Figure 23 Schematic diagrams of the shielding member provided in some embodiments of this application in other embodiments;

[0169] Figure 24A schematic diagram of the structure of the shielding member provided in some embodiments of this application in other embodiments;

[0170] Figure 25 A bottom view of a shielding component for a battery cell provided in some embodiments of this application;

[0171] Figure 26 This is a schematic diagram showing the connection between the protective patch and the wall portion provided in some embodiments of this application;

[0172] Figure 27 This is a schematic diagram showing the connection between the protective patch and the adhesive layer provided in some embodiments of this application;

[0173] Figure 28 This is a partial structural diagram of a battery cell provided in some embodiments of this application.

[0174] Icons: 1000 - Vehicle; 100 - Battery; 10 - Housing; 11 - First Housing Body; 12 - Second Housing Body; 20 - Battery Cell; 21 - Housing; 211 - Wall; 2111 - Mounting Hole; 2111a - First Connecting Surface; 2111b - First Hole Section; 2111c - Second Hole Section; 2112 - First Surface; 2113 - Mounting Slot; 2113a - Second Corner Surface; 2113b - Second Side Surface; 2114 - Second Surface; 212 - Housing; 2121 - Opening; 213 - End Cap; 22 - Electrode Assembly; 22 1-Electrode; 23-One-way valve; 231-Valve body; 2311-Mounting cavity; 2312-Inlet; 2313-Outlet; 2314-Valve body; 2314a-Sink; 2314b-Second connecting surface; 2314c-Connecting part; 2314d-First stress relief groove; 2315-Valve cover; 2315a-Protrusion; 2315b-First guide post; 2315c-First limiting groove; 232-Valve core; 2321-Elastic element; 2322-Sealing element; 2322a-Pressure part; 2322b-Sealing part; 2322c - Second guide post; 2322d- Second limiting groove; 2322e- Limiting protrusion; 2322f- First abutting surface; 2322g- Second abutting surface; 2322h- Snap-fit ​​groove; 2322k- Snap-fit ​​part; 24- Electrode terminal; 25- Pressure relief mechanism; 26- Insulating component; 261- Body part; 2611- Assembly hole; 2612- Receiving groove; 262- Receiving part; 2621- Second through hole; 2622- First wall; 2623- Second wall; 2624- Flanged part; 27- Blocking component; 271- First corner surface; 272- Second... One side; 273-Second groove; 274-Abutting part; 275-Third surface; 2751-First groove; 2752-Second groove; 276-Fourth surface; 28-Exhaust channel; 281-Third exhaust gap; 282-Fourth exhaust gap; 283-Exhaust port; 29-Protective patch; 291-Information acquisition hole; 292-Second clearance hole; 293-Third clearance hole; 30-Adhesive layer; 301-First clearance hole; 31-Current collection component; 311-Clearing groove; 200-Controller; 300-Motor; X-Thickness direction of the wall. Detailed Implementation

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] 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.

[0180] 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.

[0181] In this application, "multiple" means two or more (including two).

[0182] 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.

[0183] 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.

[0184] 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.

[0185] 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.

[0186] 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.

[0187] 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.).

[0188] 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 / 3O2 (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.

[0189] 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.

[0190] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0191] 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.).

[0192] 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.

[0193] 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.

[0194] 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.

[0195] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0196] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0197] 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.

[0198] 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.

[0199] 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.

[0200] 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.

[0201] 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.

[0202] 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.

[0203] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0204] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0205] 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.

[0206] 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.

[0207] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0208] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0209] In some implementations, the electrode assembly is a stacked structure.

[0210] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0211] 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.

[0212] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0213] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0214] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0215] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0216] 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.

[0217] 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.

[0218] 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.

[0219] 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.

[0220] 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.

[0221] 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.

[0222] 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.

[0223] In some embodiments, the battery can be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0224] 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.

[0225] 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.

[0226] 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. The battery cell includes a housing, an electrode assembly, and a one-way valve. The housing has a wall, the electrode assembly is housed inside the housing, and the one-way valve is disposed in the wall. The one-way valve is used to discharge gas inside the housing.

[0227] In this type of battery cell, a one-way valve is installed on the wall of the outer casing. This valve can open in one direction and discharge the gas inside the casing to the outside. When gas is generated inside the casing during normal use of the battery cell, it can be discharged to the outside through the one-way valve. This alleviates the phenomenon that the internal pressure of the battery cell will reach the threshold prematurely due to the rise in internal gas pressure, thus preventing premature actuation and depressurization. This effectively improves the stability of the battery cell and enhances its service life and reliability.

[0228] 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.

[0229] 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.

[0230] 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.

[0231] 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.

[0232] 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.

[0233] 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.

[0234] The housing 10 provides assembly space for the battery cell 20, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cell 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 together define the assembly space; in other embodiments, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12. Of course, the housing 10 formed by the first housing body 11 and the second housing body 12 can be of various shapes, such as a cylinder or a cuboid. For example, in Figure 2 In the middle, the shape of box 10 is a cuboid.

[0235] 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.

[0236] 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.

[0237] 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.

[0238] According to some embodiments of this application, refer to Figure 3 , Figure 4 , Figure 5 and Figure 6 , Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. Figure 4 This is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application. Figure 5 This is a partial cross-sectional view of a battery cell 20 provided in some embodiments of this application. Figure 6 This is a schematic diagram of the structure of a one-way valve 23 provided in some embodiments of this application. This application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, and a one-way valve 23. The housing 21 has a wall 211, the electrode assembly 22 is housed within the housing 21, and the one-way valve 23 is disposed on the wall 211. The one-way valve 23 is used to discharge gas from inside the housing 21.

[0239] The outer shell 21 can also be used to contain electrolytes, such as electrolyte solution. The outer shell 21 can have various structural forms, such as a cylinder or a cuboid. Similarly, the outer shell 21 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0240] In some embodiments, the housing 21 may include a housing 212 and an end cap 213. The housing 212 has an internal cavity for accommodating the electrode assembly 22 and has an opening 2121. That is, the housing 212 is a hollow structure with an opening 2121 at one end. The end cap 213 covers the opening 2121 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0241] It should be noted that the wall portion 211 for mounting the one-way valve 23 can be the end cap 213 of the housing 21, or it can be a wall of the housing 212 of the housing 21. For example, in... Figure 3 In this embodiment, the wall portion 211 is the end cap 213. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the wall portion 211 can also be the bottom wall of the housing 212 and the end cap 213 that are disposed opposite to each other, or the wall portion 211 can also be the side wall of the housing 212 and the end cap 213 that are adjacent to each other and connected to each other.

[0242] When assembling the battery cell 20, the electrode assembly 22 can be placed into the housing 212 first, and the electrolyte can be filled into the housing 212. Then, the end cap 213 can be closed onto the opening 2121 of the housing 212 to complete the assembly of the battery cell 20.

[0243] The housing 212 can have various shapes, such as a cylinder, cuboid, or prism. The shape of the housing 212 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylinder, a cylindrical housing 212 can be used; if the electrode assembly 22 is a cuboid, a cuboid housing 212 can be used. Similarly, the end cap 213 can have various structures, such as a plate-like structure or a hollow structure open at one end. For example, in… Figure 3 In the middle, the shell 212 has a cuboid structure.

[0244] Of course, it is understandable that the outer casing 21 is not limited to the structure described above. The outer casing 21 can also be other structures. For example, the outer casing 21 can include a housing 212 and two end caps 213. The housing 212 is a hollow structure with openings 2121 on opposite sides. One end cap 213 is fitted onto one opening 2121 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte. That is, the housing 212 has openings 2121 on opposite sides, and the two end caps 213 are fitted onto the opposite sides of the housing 212 to close the corresponding openings 2121.

[0245] It should be noted that the electrode assembly 22 is the component in the battery cell 20 where the electrochemical reaction occurs. The structure of the electrode assembly 22 can be various. For example, the electrode assembly 22 can be a wound structure formed by winding the positive electrode, the separator and the negative electrode, or a stacked structure formed by arranging the positive electrode, the separator and the negative electrode in layers.

[0246] 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.

[0247] Optionally, the electrode assembly 22 housed within the housing 21 can be one or more. For example, in... Figure 3 In this embodiment, the outer casing 21 of the battery cell 20 is provided with two electrode assemblies 22, which are stacked along their thickness direction. That is, the two electrode assemblies 22 are stacked along the thickness direction of the battery cell 20. Of course, in other embodiments, the electrode assemblies 22 housed in the outer casing 21 may be one, three, four, five, six, seven, or eight, etc.

[0248] It should be noted that the one-way valve 23 is disposed on the wall portion 211. The one-way valve 23 is used to discharge gas inside the outer casing 21. That is, the one-way valve 23 can open in one direction to discharge gas, so that the gas inside the outer casing 21 can be discharged to the outside of the outer casing 21 through the one-way valve 23. Optionally, the structure of the one-way valve 23 disposed on the wall portion 211 can be various. It can be that the one-way valve 23 is welded to the wall portion 211, or it can be clipped to the wall portion 211, or it can be glued to the wall portion 211. Here, the outside of the outer casing 21 refers to the external environment of the battery cell 20.

[0249] For example, in Figure 5In the middle, the wall portion 211 is provided with a mounting hole 2111, which connects the inside of the housing 21 and the outside of the housing 21. A portion of the one-way valve 23 is assembled into the mounting hole 2111 and extends into the inside of the housing 21 along the thickness direction X of the wall portion. The one-way valve 23 is sealed to the wall surface of the mounting hole 2111.

[0250] In some embodiments, the battery cell 20 may further include an electrode terminal 24, which is insulatedly mounted on the housing 21 and electrically connected to the electrode assembly 22 to output or input electrical energy of the battery cell 20.

[0251] It should be noted that the electrode terminal 24 is insulated and mounted on the housing 21, meaning that there is no electrical connection between the electrode terminal 24 and the housing 21.

[0252] Among them, Figure 3 In this design, each battery cell 20 includes two electrode terminals 24. Correspondingly, each electrode assembly 22 has two tabs 221 with opposite polarities. The two electrode terminals 24 are electrically connected to the two tabs 221 of the electrode assembly 22, respectively, to achieve the input or output of the positive and negative electrodes of the battery cell 20. It should be noted that the tabs 221 of the electrode assembly 22 are formed by stacking and connecting regions of the positive electrode sheet that are not coated with a positive active material layer, or by stacking and connecting regions of the negative electrode sheet that are not coated with a negative active material layer. If the tabs 221 are used to output the positive electrode of the electrode assembly 22, then the tabs 221 are formed by stacking and connecting regions of the positive electrode sheet that are not coated with a positive active material layer; if the tabs 221 are used to output the negative electrode of the electrode assembly 22, then the tabs 221 are formed by stacking and connecting regions of the negative electrode sheet that are not coated with a negative active material layer.

[0253] For example, the electrode terminal 24 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0254] The structure in which the electrode terminal 24 is mounted on the housing 21 can be varied; for example, in... Figure 3 In this embodiment, both electrode terminals 24 are mounted on the end cap 213 of the housing 21. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, both electrode terminals 24 may be mounted on the housing 212 of the housing 21. Similarly, one electrode terminal 24 may be mounted on the housing 212 of the housing 21, and the other electrode terminal 24 may be mounted on the end cap 213 of the housing 21.

[0255] In some embodiments, the battery cell 20 may further include a pressure relief mechanism 25, which is mounted on the housing 21. Optionally, the pressure relief mechanism 25 may be disposed on the end cap 213 of the housing 21 or on the housing 212 of the housing 21. The pressure relief mechanism 25 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.

[0256] For example, in Figure 4 In the housing 21, the pressure relief mechanism 25 is disposed on the end cover 213 of the housing 21. The pressure relief mechanism 25 can be a pressure relief component such as an explosion-proof valve, an explosion-proof disc, a pressure relief valve or a safety valve.

[0257] By providing a one-way valve 23 on the wall 211 of the outer casing 21, the one-way valve 23 can open in one direction and discharge the gas inside the outer casing 21 to the outside of the outer casing 21. Thus, when gas is generated inside the outer casing 21 during normal use of the battery cell 20, it can be discharged to the outside of the outer casing 21 through the one-way valve 23. This alleviates the phenomenon that the internal pressure of the battery cell 20 reaches the threshold prematurely due to the rise in internal gas pressure, thereby preventing premature actuation and depressurization of the battery cell 20. This effectively improves the stability of the battery cell 20 in use, thereby increasing its service life and reliability.

[0258] 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 Figure 8 shows an exploded view of the structure of a one-way valve 23 provided in some embodiments of this application, and Figure 9 shows a cross-sectional view of the one-way valve 23 provided in some embodiments of this application. The one-way valve 23 may include a valve body 231 and a valve core 232. The valve body 231 is disposed on the wall portion 211, and an installation cavity 2311 is formed inside the valve body 231. An air inlet 2312 and an air outlet 2313 are provided on the valve body 231. The air inlet 2312 connects the installation cavity 2311 and the interior of the outer casing 21, and the air outlet 2313 connects the installation cavity 2311 and the exterior of the outer casing 21. The valve core 232 is disposed within the installation cavity 2311. The valve core 232 is used to block the air inlet 2312 and to open the air inlet 2312 under the action of gas inside the outer casing 21.

[0259] The air inlet 2312 is used to connect the interior of the mounting cavity 2311 and the interior of the outer shell 21, that is, the gas inside the outer shell 21 can enter the mounting cavity 2311 through the air inlet 2312. Similarly, the air outlet 2313 is used to connect the exterior of the mounting cavity 2311 and the exterior of the outer shell 21, that is, the gas inside the outer shell 21 that enters the mounting cavity 2311 can be discharged to the exterior of the outer shell 21 through the air outlet 2313.

[0260] The valve core 232 is used to block the air inlet 2312 and to open the air inlet 2312 under the action of the gas inside the housing 21. That is, when the valve core 232 can block the air inlet 2312, the gas outside the housing 21 cannot enter the interior of the housing 21, and the gas inside the housing 21 cannot be discharged to the outside of the housing 21. When the pressure of the gas inside the housing 21 reaches a certain threshold, the gas inside the housing 21 can push the valve core 232 to open the air inlet 2312, so that the gas inside the housing 21 can enter the mounting cavity 2311 and then be discharged to the outside of the housing 21 through the air outlet 2313.

[0261] Alternatively, the structure of the valve core 232 can be various, for example, in Figure 5 and Figure 7 In this process, the valve core 232 may include an elastic element 2321 and a sealing element 2322. Both the elastic element 2321 and the sealing element 2322 are disposed within the mounting cavity 2311. The elastic element 2321 is configured to provide an elastic force to the sealing element 2322, so that the sealing element 2322 can block the air inlet 2312. When the force exerted by the gas inside the housing 21 on the sealing element 2322 is greater than the elastic force of the elastic element 2321, the gas inside the housing 21 can overcome the elastic element 2321. The elastic force of the valve core 2321 pushes the sealing element 2322 to open the air inlet 2312, allowing gas inside the housing 21 to enter the mounting cavity 2311 and then exit through the air outlet 2313. Conversely, after the gas inside the housing 21 is discharged and the force exerted by the gas inside the housing 21 on the sealing element 2322 is less than the elastic force of the elastic element 2321, the elastic element 2321 can drive the sealing element 2322 to reset, thereby sealing the air inlet 2312. Of course, in other embodiments, the valve core 232 can also be an integral elastic component, such as elastic rubber.

[0262] The one-way valve 23 is provided with a valve body 231 and a valve core 232. The valve body 231 is disposed on the wall 211, and the valve body 231 is provided with an air inlet 2312 connecting the mounting cavity 2311 and the inside of the outer shell 21, and an air outlet 2313 connecting the mounting cavity 2311 and the outside of the outer shell 21. By placing the valve core 232 in the mounting cavity 2311, the valve core 232 can block the air inlet 2312. When the pressure inside the outer shell 21 rises, the gas inside the outer shell 21 can act on the valve core 232 and drive the valve core 232 to open the air inlet 2312, so as to realize the one-way exhaust function of the one-way valve 23, thereby enabling the one-way valve 23 to exhaust the gas inside the outer shell 21 to the outside of the outer shell 21.

[0263] According to some embodiments of this application, please refer to Figure 5 , Figure 7 and Figure 8 As shown, the valve body 231 may include a valve body 2314 and a valve cover 2315. The valve body 2314 is disposed on the wall portion 211 and has an air inlet 2312. Along the thickness direction X of the wall portion, the valve cover 2315 is disposed at the end of the valve body 2314 opposite to the electrode assembly 22, and the valve cover 2315 and the valve body 2314 together enclose and form a mounting cavity 2311.

[0264] The valve body 2314 is disposed on the wall portion 211 and extends into the housing 21 along the thickness direction X of the wall portion, that is, the valve body 2314 protrudes from the surface of the wall portion 211 facing the electrode assembly 22 along the thickness direction X of the wall portion. The valve body 2314 is sealed and installed in the mounting hole 2111. The valve body 2314 can be welded to the wall portion 211 or bonded to the wall portion 211 with sealant.

[0265] The valve body 2314 is provided with an air inlet 2312. For example, the air inlet 2312 is provided at one end of the valve body 2314 facing the electrode assembly 22 in the thickness direction X of the wall. Of course, in other embodiments, the air inlet 2312 may also be provided on the outer peripheral surface of the portion of the valve body 2314 extending into the housing 21.

[0266] Optionally, the valve cover 2315 is disposed at one end of the valve body 2314 away from the electrode assembly 22. This can be either the valve cover 2315 is connected to the end of the valve body 2314 away from the electrode assembly 22, or the valve cover 2315 is connected to the wall portion 211 and the valve cover 2315 and valve body 2314 are arranged along the thickness direction X of the wall portion. For example, in... Figure 5 and Figure 8 In this configuration, the valve cover 2315 is connected to the end of the valve body 2314 that is away from the electrode assembly 22, so that the valve cover 2315 and the interior of the valve body 2314 together enclose and form a mounting cavity 2311 for accommodating the valve core 232.

[0267] It should be noted that in the embodiment where the valve cover 2315 is connected to the end of the valve body 2314 away from the electrode assembly 22, the air outlet 2313 can be directly opened on the valve cover 2315, that is, the air outlet 2313 is a channel set on the valve cover 2315, or it can be set between the valve cover 2315 and the valve body 2314, that is, the air outlet 2313 is a gap formed between the valve cover 2315 and the valve body 2314.

[0268] For example, the valve body 2314 can be made of a metal, such as copper, iron, aluminum, steel, or aluminum alloy. Similarly, the valve cover 2315 can also be made of a metal, such as copper, iron, aluminum, steel, or aluminum alloy. The valve body 2314 and the valve cover 2315 can be made of the same material or different materials.

[0269] The valve body 231 of the one-way valve 23 is provided with a valve body 2314 and a valve cover 2315. By connecting the valve cover 2315 to the end of the valve body 2314 away from the electrode assembly 22 in the thickness direction X of the wall, the valve cover 2315 and the valve body 2314 jointly define the mounting cavity 2311 for accommodating the valve core 232. The one-way valve 23 with this structure sets the valve body 231 into two parts, which makes it easier to assemble the valve core 232 into the mounting cavity 2311 and reduces the assembly difficulty of the one-way valve 23.

[0270] In some embodiments, see Figure 6 , Figure 7 and Figure 8 As shown, the valve cover 2315 is connected to the valve body 2314, and the air outlet 2313 is the first through hole provided on the valve cover 2315.

[0271] The air outlet 2313 extends through both sides of the valve cover 2315 along the thickness direction X of the wall, so that the air outlet 2313 communicates with the mounting cavity 2311.

[0272] Optionally, the air outlet 2313 provided on the valve cover 2315 can be one or more. For example, in... Figure 6 In the valve cover 2315, there are three air outlets 2313. Of course, in other embodiments, there may be two, four, five or six air outlets 2313 on the valve cover 2315.

[0273] As an example, there are multiple air outlets 2313 provided on the valve cover 2315, and the multiple air outlets 2313 are arranged at equal intervals.

[0274] As an example, multiple air outlets 2313 are arranged at equal intervals around the center of the valve cover 2315, which allows the gas to flow out more smoothly.

[0275] By providing a first through hole on the valve cover 2315 of the valve body 231 to form an air outlet 2313 of the valve body 231, the mounting cavity 2311 of the valve body 231 can communicate with the outside of the outer shell 21 through the first through hole provided on the valve cover 2315. The valve body 231 with this structure can reduce the interference effect of the air outlet 2313 on the connection between the valve cover 2315 and the valve body 2314, which is beneficial to reduce the assembly difficulty of the valve cover 2315 and the valve body 2314.

[0276] Of course, in embodiments where the valve cover 2315 is connected to the end of the valve body 2314 away from the electrode assembly 22, the structure of the air outlet 2313 is not limited to this. In some embodiments, refer to... Figure 9 , Figure 9This is a schematic diagram of the structure of a one-way valve 23 provided in some embodiments of this application. The valve cover 2315 is connected to the valve body 2314, and the air outlet 2313 is the first exhaust gap formed between the valve cover 2315 and the valve body 2314.

[0277] The valve cover 2315 has multiple protrusions 2315a on its outer peripheral surface. The multiple protrusions 2315a are arranged at intervals along the circumference of the valve cover 2315. The protrusions 2315a are interference-fitted with the valve body 2314. A first exhaust gap is formed between the area of ​​the outer peripheral surface of the valve cover 2315 where no protrusions 2315a are provided and the valve body 2314. That is, in the circumference of the valve cover 2315, the exhaust port 2313 is formed between two adjacent protrusions 2315a.

[0278] By setting a first exhaust gap between the valve cover 2315 and the valve body 2314 to form the exhaust port 2313 of the valve body 231, the mounting cavity 2311 of the valve body 231 can communicate with the outside of the outer shell 21 through the first exhaust gap formed between the valve cover 2315 and the valve body 2314. The structure is simple and easy to process.

[0279] According to some embodiments of this application, see Figure 6 , Figure 7 and Figure 8 As shown, the valve cover 2315 is connected to the valve body 2314. The valve body 2314 has a recess 2314a at one end away from the electrode assembly 22. At least a portion of the valve cover 2315 is accommodated in the recess 2314a.

[0280] The mounting cavity 2311 penetrates the bottom surface of the sink 2314a, and the valve cover 2315 is assembled in the sink 2314a and abuts against the bottom surface of the sink 2314a, so that the valve cover 2315 and the valve body 2314 enclose each other to form the mounting cavity 2311.

[0281] At least a portion of the valve cover 2315 is accommodated within the recess 2314a. That is, the valve cover 2315 may be entirely located within the recess 2314a or partially located within the recess 2314a. In other words, in the thickness direction X of the wall, the valve cover 2315 may extend out of the recess 2314a or may not extend out of the recess 2314a.

[0282] By providing a recess 2314a on the end of the valve body 2314 away from the electrode assembly 22, and at least a portion of the valve cover 2315 is accommodated in the recess 2314a, the one-way valve 23 with this structure can save the space occupied by the valve body 231 in the thickness direction X of the wall, improve the structural stability of the valve cover 2315 assembled on the valve body 2314, and provide a certain degree of protection for the valve cover 2315 to reduce the phenomenon of wear or damage to the valve cover 2315.

[0283] In some embodiments, see Figure 8 As shown, along the thickness direction X of the wall, the valve cover 2315 does not extend beyond the end of the valve body 2314 away from the electrode assembly 22. That is to say, the entire valve cover 2315 is located within the settling groove 2314a.

[0284] For example, in the thickness direction X of the wall portion, the surface of the valve cover 2315 facing away from the electrode assembly 22 is flush with the end face of the valve body 2314 facing away from the electrode assembly 22.

[0285] By setting the valve cover 2315 in the thickness direction X of the wall portion to not exceed the end of the valve body 2314 away from the electrode assembly 22, the valve cover 2315 is located entirely within the recess 2314a, thereby further saving the space occupied by the valve body 231 in the thickness direction X of the wall portion and further improving the protection of the valve cover 2315, so as to reduce the phenomenon of wear or damage to the valve cover 2315.

[0286] In some embodiments, see Figure 5 As shown, along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2112 that is away from the electrode assembly 22, and the valve body 2314 does not extend beyond the first surface 2112.

[0287] In this embodiment, the valve body 2314 does not extend beyond the first surface 2112. That is, the valve body 2314 of the valve body 231 does not protrude from the side of the wall portion 211 away from the electrode assembly 22 in the thickness direction X of the wall portion. In the embodiment where the valve cover 2315 is connected to the valve body 2314 and is located entirely within the sink 2314a, the one-way valve 23 does not protrude from the side of the wall portion 211 away from the electrode assembly 22 in the thickness direction X of the wall portion.

[0288] By setting the valve body 2314 of the valve body 231 in the thickness direction X of the wall portion to not exceed the first surface 2112 of the wall portion 211 away from the electrode assembly 22, the valve body 231 does not protrude from the first surface 2112 in the thickness direction X of the wall portion. On the one hand, it can save the space occupied by the battery cell 20 in the thickness direction X of the wall portion. On the other hand, it can reduce the phenomenon of wear or collision between the valve body 231 and the external environment, which is conducive to improving the protection of the valve body 231 and thus extending the service life of the one-way valve 23.

[0289] Of course, the assembly structure of the one-way valve 23 and the wall portion 211 is not limited to this. In some embodiments, the battery cell 20 can also have other structures, for example, see reference. Figure 10 , Figure 10This is a partial cross-sectional view of a battery cell 20 provided in some embodiments of this application. The valve cover 2315 is connected to the wall portion 211, and the vent 2313 is a second exhaust gap formed between the valve cover 2315 and the wall portion 211.

[0290] Wherein, the valve cover 2315 is located at the end of the valve body 2314 away from the electrode assembly 22 in the thickness direction X of the wall portion, and the valve cover 2315 is connected to the wall portion 211, so that the valve cover 2315 and the valve body 2314 together define the mounting cavity 2311 for accommodating the valve core 232.

[0291] For example, in Figure 10 In the middle, the wall portion 211 has a first surface 2112 facing away from the electrode assembly 22. The first surface 2112 is provided with a mounting groove 2113. The valve cover 2315 is accommodated in the mounting groove 2113. The surface of the valve cover 2315 facing away from the electrode assembly 22 in the thickness direction X of the wall portion is flush with the first surface 2112. The second exhaust gap is formed between the valve cover 2315 and the groove side of the mounting groove 2113.

[0292] Optionally, the structure by which the valve cover 2315 is connected to the wall portion 211 can be varied. For example, the valve cover 2315 can be welded to the side of the mounting groove 2113, or the valve cover 2315 can be press-fitted to the side of the mounting groove 2113. Similarly, the exhaust port 2313 is a second exhaust gap formed between the valve cover 2315 and the wall portion 211. The structure of the second exhaust gap can also be varied. For example, it can be a first groove provided on the outer peripheral surface of the valve cover 2315, with the bottom surface of the first groove and the side surface of the mounting groove 2113 forming the second exhaust gap.

[0293] By connecting the valve cover 2315 to the wall portion 211, and the air outlet 2313 of the valve body 231 being a second exhaust gap located between the valve cover 2315 and the wall portion 211, the battery cell 20 with this structure can, on the one hand, increase the size of the mounting cavity 2311 formed between the valve cover 2315 and the valve body 2314, thereby improving the exhaust efficiency and smoothness of the one-way valve 23. On the other hand, the air outlet 2313 of the one-way valve 23 can be directly formed between the valve cover 2315 and the wall portion 211, which helps to reduce the phenomenon of the air outlet 2313 being blocked by other components of the battery cell 20.

[0294] According to some embodiments of this application, see Figure 5As shown, the valve body 2314 and the wall portion 211 of the valve body 231 are separate structures. The wall portion 211 has a mounting hole 2111 that connects the inside and outside of the outer casing 21. The valve body 2314 of the valve body 231 is inserted into the mounting hole 2111 and is sealed to the wall surface of the mounting hole 2111. Of course, in some embodiments, the battery cell 20 can also have other structures, such as the valve body 2314 and the wall portion 211 being integrally formed. That is, the valve body 2314 and the wall portion 211 of the valve body 231 are integral structures, manufactured by an integral forming process, such as stamping or casting. By making the valve body 2314 and the wall portion 211 of the valve body 231 into an integral structure, it is beneficial to improve the structural stability and structural strength of the valve body 2314 disposed on the wall portion 211.

[0295] According to some embodiments of this application, see Figure 5 , Figure 7 and Figure 8 As shown, the valve core 232 may include an elastic element 2321 and a sealing element 2322. The elastic element 2321 is disposed in the mounting cavity 2311, and the sealing element 2322 is movably disposed in the mounting cavity 2311. The sealing element 2322 is used to block the air inlet 2312 under the action of the elastic element 2321, and is also used to open the air inlet 2312 under the action of the gas inside the housing 21.

[0296] The sealing element 2322 is movably disposed within the mounting cavity 2311, meaning that the sealing element 2322 can move within the mounting cavity 2311 so that when the sealing element 2322 moves toward the air inlet 2312, it can block the air inlet 2312; conversely, when the sealing element 2322 moves away from the air inlet 2312, it can open the air inlet 2312.

[0297] For example, the air inlet 2312 is located at one end of the valve body 2314 in the thickness direction X of the wall portion, near the electrode assembly 22. That is, the air inlet 2312 penetrates the bottom surface of the mounting cavity 2311. Correspondingly, the sealing member 2322 is movably disposed within the mounting cavity 2311 along the thickness direction X of the wall portion, so that the sealing member 2322 can block the air inlet 2312 when it abuts against the bottom surface of the mounting cavity 2311. Of course, in other embodiments, the air inlet 2312 may also be located on one side of the valve body 2314 in the radial direction, and correspondingly, the sealing member 2322 is movably disposed within the mounting cavity 2311 in the radial direction of the valve body 2314.

[0298] The sealing element 2322 is used to block the air inlet 2312 under the action of the elastic element 2321, and to open the air inlet 2312 under the action of the gas inside the housing 21. That is, the elastic element 2321 can provide elastic force to the sealing element 2322, so that the sealing element 2322 can abut against the bottom surface of the mounting cavity 2311 to block the air inlet 2312. Conversely, when the force of the gas inside the housing 21 acting on the sealing element 2322 is greater than the elastic force of the elastic element 2321, the gas inside the housing 21 can overcome the elastic force of the elastic element 2321 and push the sealing element 2322 to separate from the bottom surface of the mounting cavity 2311, so that the sealing element 2322 opens the air inlet 2312, thereby allowing the gas inside the housing 21 to enter the mounting cavity 2311 through the air inlet 2312 and then be discharged through the air outlet 2313.

[0299] Optionally, the elastic element 2321 is a component with elasticity, and its structure can be various, such as a sheet, a spring, or elastic rubber.

[0300] The valve core 232 of the one-way valve 23 is provided with an elastic element 2321 and a sealing element 2322, and both the elastic element 2321 and the sealing element 2322 are disposed in the mounting cavity 2311. This allows the elastic element 2321 to apply an elastic force to the sealing element 2322, so that the sealing element 2322 can block the air inlet 2312, thereby preventing gas outside the housing 21 from entering the interior of the housing 21. When the pressure inside the housing 21 rises, the gas inside the housing 21 can act on the sealing element 2322 and overcome the elastic force of the elastic element 2321, so that the sealing element 2322 can open the air inlet 2312, thereby allowing the gas inside the housing 21 to be discharged through the one-way valve 23. This enables the one-way valve 23 to discharge the gas inside the housing 21 to the outside of the housing 21 and prevent the gas outside the housing 21 from entering the interior of the housing 21.

[0301] In some embodiments, see Figure 7 and Figure 8 As shown, the elastic element 2321 is a spring. Of course, in other embodiments, the elastic element 2321 can also be a sheet or elastic rubber, etc.

[0302] It should be noted that the projection of the air outlet 2313 on the thickness direction X of the wall can be located inside the spring or outside the spring. When there are multiple air outlets 2313, the projections of the multiple air outlets 2313 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.

[0303] The spring is arranged along the thickness direction X of the wall, with its two ends abutting against the sealing member 2322 and the valve cover 2315 respectively. The spring is in a compressed state between the valve cover 2315 and the sealing member 2322, so that the spring can apply elastic force to the sealing member 2322, so that the sealing member 2322 can abut against the bottom surface of the mounting cavity 2311 to seal the air inlet 2312.

[0304] Optionally, the compression allowance of the elastic element 2321, which is located in a compressed state between the valve cover 2315 and the sealing element 2322, is greater than or equal to 0.5 mm, so that the elastic element 2321 has sufficient compression allowance for the sealing element 2322 to move along the thickness direction X of the wall, allowing the sealing element 2322 to open the air inlet 2312. If the elastic element 2321 is a spring, then the sum of the gaps between the spring coils in the thickness direction X of the wall is greater than or equal to 0.5 mm.

[0305] Using a spring as the elastic element 2321 set in the mounting cavity 2311 facilitates the assembly of the elastic element 2321 and reduces the difficulty of assembling the elastic element 2321 in the mounting cavity 2311. On the other hand, it can make the direction of the elastic force applied by the elastic element 2321 to the sealing element 2322 more stable.

[0306] In some embodiments, the elastic element 2321 is made of steel, iron, or aluminum. An elastic element 2321 made of steel, iron, or aluminum has good toughness and can mitigate elastic failure, thus improving its service life.

[0307] According to some embodiments of this application, see Figure 5 , Figure 7 and Figure 8 As shown, along the thickness direction X of the wall, the valve cover 2315 and the sealing member 2322 are spaced apart, the two ends of the elastic member 2321 abut against the valve cover 2315 and the sealing member 2322 respectively, and the air inlet 2312 is provided on the bottom surface of the mounting cavity 2311.

[0308] Along the thickness direction X of the wall, the valve cover 2315 and the bottom surface of the mounting cavity 2311 face each other, and the elastic element 2321 is disposed between the valve cover 2315 and the sealing element 2322, so that the sealing element 2322 can abut against the bottom surface of the mounting cavity 2311 under the action of the elastic element 2321, thereby blocking the air inlet 2312. Of course, if the air inlet 2312 is disposed on the cavity wall surface of the mounting cavity 2311, that is, the air inlet 2312 is disposed on one side of the radial direction of the valve body 2314, then the sealing element 2322 and the elastic element 2321 are arranged radially along the valve body 2314, and the two ends of the elastic element 2321 abut against the sealing element 2322 and the cavity wall surface of the mounting cavity 2311, respectively.

[0309] Optionally, the structure of the sealing element 2322 can be various, in Figure 7 and Figure 8 In this device, the sealing component 2322 includes a pressing part 2322a and a sealing part 2322b. The rigidity of the pressing part 2322a is greater than that of the sealing part 2322b. Along the thickness direction X of the wall, the sealing part 2322b is connected to the side of the pressing part 2322a away from the valve cover 2315. The sealing part 2322b is used to block the air inlet 2312. The elastic element 2321 is disposed between the valve cover 2315 and the pressing part 2322a. The pressing part 2322a can be pressed against the sealing part 2322b under the elastic force of the elastic element 2321, so that the sealing part 2322b abuts against the cavity wall surface of the mounting cavity 2311, thereby blocking the air inlet 2312 through the sealing part 2322b. Of course, in other embodiments, the sealing member 2322 may also be a single sealed component, such as a rubber pad or silicone pad, that is, the sealing member 2322 may only include the sealing part 2322b, and the two ends of the elastic member 2321 may abut against the valve cover 2315 and the sealing part 2322b respectively.

[0310] By setting the valve cover 2315 and the sealing member 2322 to be arranged at intervals along the thickness direction X of the wall, the two ends of the elastic member 2321 can respectively abut against the valve cover 2315 and the sealing member 2322. This allows the sealing member 2322 to block the air inlet 2312 located on the bottom surface of the mounting cavity 2311 along the thickness direction X of the wall under the action of the elastic member 2321. In other words, the air inlet 2312 is located at the end of the valve body 2314 facing the electrode assembly 22 in the thickness direction X of the wall. The sealing member 2322 can move along the thickness direction X of the wall under the action of the elastic member 2321 and block the air inlet 2312. The one-way valve 23 with this structure facilitates the application of elastic force from the elastic member 2321 to the sealing member 2322 so that the sealing member 2322 blocks the air inlet 2312, and also reduces the assembly difficulty of the elastic member 2321.

[0311] According to some embodiments of this application, see Figure 7 and Figure 8 As shown, a first guide post 2315b protrudes from the side of the valve cover 2315 facing the sealing member 2322, and part of the elastic member 2321 is sleeved on the outside of the first guide post 2315b.

[0312] Among them, the elastic element 2321 is a spring, and part of the spring is sleeved on the outside of the first guide post 2315b. The end of the spring away from the sealing element 2322 abuts against the surface of the valve cover 2315 where the first guide post 2315b is protruding, that is, the first guide post 2315b is inserted into the spring.

[0313] For example, the central axis of the first guide post 2315b coincides with the central axis of the mounting hole 2111, and the central axis of the elastic element 2321 coincides with the central axis of the first guide post 2315b.

[0314] By protruding a first guide post 2315b on the side of the valve cover 2315 facing the sealing member 2322, and partially sleeved on the outside of the first guide post 2315b, the one-way valve 23 with this structure can, on the one hand, use the first guide post 2315b to position the elastic member 2321, facilitating the assembly of the elastic member 2321 and reducing the assembly difficulty of the elastic member 2321. On the other hand, the first guide post 2315b can guide the elastic member 2321 when it is compressed along the thickness direction X of the wall, reducing the radial deformation of the elastic member 2321 during compression. This allows the elastic member 2321 to be stably compressed along the thickness direction X of the wall, improving the reliability of the elastic member 2321 and reducing the risk of the sealing member 2322 accidentally opening the air inlet 2312.

[0315] It should be noted that in embodiments where the valve cover 2315 has a protruding first guide post 2315b and the air outlet 2313 is a first through hole on the valve cover 2315, the structure of the valve cover 2315 can be varied, for example, see [reference needed]. Figure 6 , Figure 7 and Figure 8 As shown, the valve cover 2315 is connected to the valve body 2314, and the air outlet 2313 is a first through hole provided on the valve cover 2315. Along the radial direction of the first guide post 2315b, the air outlet 2313 and the first guide post 2315b are arranged at intervals.

[0316] The air outlet 2313 and the first guide post 2315b are arranged at intervals, meaning the air outlet 2313 is located outside the first guide post 2315b. For example, in... Figure 7 and Figure 8 In the middle, there are three air outlets 2313. The three air outlets 2313 are arranged at intervals along the circumference of the first guide post 2315b. The three air outlets 2313 are arranged around the outside of the first guide post 2315b and are arranged around the central axis of the mounting hole 2111. Of course, in other embodiments, there may be two, four or five air outlets 2313.

[0317] In some embodiments, the valve cover 2315 may also have other structures, such as those described above. Figure 11 and Figure 12 As shown, Figure 11 This is a schematic diagram of the structure of the one-way valve 23 provided in some embodiments of this application. Figure 12This is a cross-sectional view of a one-way valve 23 provided in some embodiments of this application. Along the thickness direction X of the wall portion, the air outlet 2313 penetrates the first guide post 2315b, that is, the air outlet 2313 is located at the position of the valve cover 2315 having the first guide post 2315b. In other words, the air outlet 2313 extends along the thickness direction X of the wall portion into and through the first guide post 2315b.

[0318] For example, in Figure 11 and Figure 12 In the middle, the valve cover 2315 is provided with an air outlet 2313, and the central axis of the air outlet 2313 coincides with the central axis of the first guide post 2315b.

[0319] By setting the air outlet 2313 as a first through hole in the valve cover 2315, and the first through hole penetrating the first guide post 2315b along the thickness direction X of the wall, the air outlet 2313 is located inside the elastic member 2321, which helps to reduce the interference effect of the air outlet 2313 on the connection between the valve cover 2315 and the valve body 2314. Similarly, by setting the air outlet 2313 as a first through hole in the valve cover 2315, and the air outlet 2313 being located outside the first guide post 2315b, it is easier for gas to be discharged, thereby reducing the phenomenon of the air outlet 2313 being blocked by the sealing member 2322.

[0320] According to some embodiments of this application, see Figure 8 As shown, the diameter of the first guide post 2315b is D1, and the inner diameter of the elastic element 2321 is D2, satisfying that 0mm < D2 - D1 ≤ 5mm.

[0321] Among them, the elastic element 2321 is a spring, and the inner diameter D2 of the elastic element 2321 is the diameter of the cavity formed on the inner side of the spring.

[0322] 0mm < D2 - D1 ≤ 5mm, that is, when the first guide post 2315b and the elastic element 2321 are coaxially arranged, the size of the gap between the first guide post 2315b and the elastic element 2321 is greater than 0mm and less than or equal to 5mm.

[0323] For example, the difference between the inner diameter of the elastic element 2321 and the diameter of the first guide post 2315b can be 0mm, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.

[0324] By setting the difference between the inner diameter of the elastic element 2321 and the diameter of the first guide post 2315b to be greater than 0 mm and less than or equal to 5 mm, on the one hand, the phenomenon that the elastic element 2321 is not easy to assemble on the first guide post 2315b due to the difference between the inner diameter of the elastic element 2321 and the diameter of the first guide post 2315b being less than or equal to 0 can be alleviated, thereby reducing the scraping phenomenon during the process of the elastic element 2321 being fitted on the first guide post 2315b. On the other hand, the phenomenon that the gap between the elastic element 2321 and the first guide post 2315b is too large due to the difference between the inner diameter of the elastic element 2321 and the diameter of the first guide post 2315b being too large can be alleviated, thereby reducing the radial movement or radial deformation of the elastic element 2321. This can improve the balance of the elastic force of the elastic element 2321 acting on the sealing element 2322, thereby reducing the risk of the sealing element 2322 accidentally opening the air inlet 2312.

[0325] According to some embodiments of this application, refer to Figure 13 , Figure 13 This is a cross-sectional view of a one-way valve 23 provided in some other embodiments of this application. A first limiting groove 2315c is provided on the side of the valve cover 2315 facing the sealing member 2322, and the end of the elastic member 2321 away from the sealing member 2322 is inserted into the first limiting groove 2315c.

[0326] In one embodiment, the valve cover 2315 has a first limiting groove 2315c on the side facing the sealing member 2322. That is, the valve cover 2315 has a first limiting groove 2315c on the surface of the valve cover 2315 facing the sealing member 2322 in the thickness direction X of the wall. In another embodiment, the valve cover 2315 has a first guide post 2315b protruding on the side facing the sealing member 2322, in which case the first limiting groove 2315c is provided on the surface of the valve cover 2315 with the first guide post 2315b protruding.

[0327] One end of the elastic element 2321 away from the sealing element 2322 is inserted into the first limiting groove 2315c, that is, the end of the elastic element 2321 away from the sealing element 2322 abuts against the bottom surface of the first limiting groove 2315c.

[0328] For example, the elastic element 2321 is a spring, and the corresponding first limiting groove 2315c is an annular groove structure. In an embodiment where the first guide post 2315b protrudes from the side of the valve cover 2315 facing the sealing element 2322, the first limiting groove 2315c is arranged around the outside of the first guide post 2315b.

[0329] The valve cover 2315 is also provided with a first limiting groove 2315c for the insertion of the elastic element 2321 on the side facing the sealing element 2322. This can limit the end of the elastic element 2321 that abuts against the valve cover 2315, thereby reducing the phenomenon of relative radial slippage between the elastic element 2321 and the valve cover 2315. This can improve the balance of the elastic force of the elastic element 2321 on the sealing element 2322, which is beneficial to improving the reliability of the elastic element 2321.

[0330] According to some embodiments of this application, the end of the elastic member 2321 away from the sealing member 2322 is fixedly connected to the valve cover 2315.

[0331] The structure in which the elastic element 2321 is fixedly connected to the valve cover 2315 can be varied, such as welding or bonding.

[0332] It should be noted that in the embodiment where a first limiting groove 2315c is provided on the side of the valve cover 2315 facing the sealing member 2322, and one end of the elastic member 2321 away from the sealing member 2322 is inserted into the first limiting groove 2315c, the end of the elastic member 2321 away from the sealing member 2322 is fixedly connected to the bottom surface of the first limiting groove 2315c; in the embodiment where a first limiting groove 2315c is not provided on the side of the valve cover 2315 facing the sealing member 2322, the end of the elastic member 2321 away from the sealing member 2322 is fixedly connected to the surface of the valve cover 2315 that abuts against it.

[0333] By fixing the end of the elastic element 2321 away from the sealing element 2322 to the valve cover 2315, the end of the elastic element 2321 that abuts against the valve cover 2315 is fixedly connected to the valve cover 2315. This improves the stability of the elastic element 2321 against the valve cover 2315, further reducing the relative slippage between the elastic element 2321 and the valve cover 2315, and further improving the balance of the elastic force exerted by the elastic element 2321 on the sealing element 2322.

[0334] According to some embodiments of this application, see Figure 5 , Figure 7 and Figure 8 As shown, the sealing member 2322 has a second guide post 2322c protruding on the side facing the valve cover 2315, and part of the elastic member 2321 is sleeved on the outside of the second guide post 2322c.

[0335] Among them, the elastic element 2321 is a spring, and part of the spring is sleeved on the outside of the second guide post 2322c. The end of the spring away from the valve cover 2315 abuts against the surface of the sealing element 2322 where the second guide post 2322c is protruding, that is, the second guide post 2322c is inserted into the spring.

[0336] For example, the central axis of the second guide post 2322c coincides with the central axis of the mounting hole 2111, and the central axis of the elastic element 2321 coincides with the central axis of the second guide post 2322c.

[0337] In an exemplary embodiment where the sealing member 2322 includes a pressing portion 2322a and a sealing portion 2322b, see [reference needed]. Figure 7 and Figure 8 As shown, the second guide post 2322c protrudes from the surface of the clamping part 2322a facing the valve cover 2315.

[0338] By providing a second guide post 2322c protruding from the side of the sealing member 2322 facing the valve cover 2315, and partially sleeved on the outside of the second guide post 2322c, the one-way valve 23 with this structure can, on the one hand, use the second guide post 2322c to position the elastic member 2321, facilitating assembly and reducing assembly difficulty. On the other hand, the second guide post 2322c can guide the elastic member 2321 when it is compressed along the thickness X of the wall, reducing radial deformation during compression. This ensures stable compression of the elastic member 2321 along the thickness X of the wall, improving its reliability and reducing the risk of the sealing member 2322 accidentally opening the air inlet 2312.

[0339] According to some embodiments of this application, see Figure 8 As shown, the diameter of the second guide post 2322c is D3, and the inner diameter of the elastic element 2321 is D2, satisfying that 0mm < D3 - D1 ≤ 5mm.

[0340] Among them, the elastic element 2321 is a spring, and the inner diameter D2 of the elastic element 2321 is the diameter of the cavity formed on the inner side of the spring.

[0341] 0mm < D3 - D1 ≤ 5mm, which means that when the second guide post 2322c and the elastic element 2321 are coaxially arranged, the size of the gap between the second guide post 2322c and the elastic element 2321 is greater than 0mm and less than or equal to 5mm.

[0342] For example, the difference between the inner diameter of the elastic element 2321 and the diameter of the guide post can be 0mm, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.

[0343] By setting the difference between the inner diameter of the elastic element 2321 and the diameter of the second guide post 2322c to be greater than 0 mm and less than or equal to 5 mm, on the one hand, the phenomenon that the elastic element 2321 is not easy to assemble on the second guide post 2322c due to the difference between the inner diameter of the elastic element 2321 and the diameter of the second guide post 2322c being less than or equal to 0 can be alleviated, thereby reducing the scraping phenomenon during the process of fitting the elastic element 2321 onto the second guide post 2322c. On the other hand, the phenomenon that the gap between the elastic element 2321 and the second guide post 2322c is too large due to the difference between the inner diameter of the elastic element 2321 and the diameter of the second guide post 2322c being too large can be alleviated, thereby reducing the radial movement or radial deformation of the elastic element 2321. This can improve the balance of the elastic force of the elastic element 2321 acting on the sealing element 2322, thereby reducing the risk of the sealing element 2322 accidentally opening the air inlet 2312.

[0344] According to some embodiments of this application, see Figure 13 As shown, the sealing member 2322 has a second limiting groove 2322d on the side facing the valve cover 2315, and the end of the elastic member 2321 away from the valve cover 2315 is inserted into the second limiting groove 2322d.

[0345] In one embodiment, the sealing member 2322 has a second limiting groove 2322d on the side facing the valve cover 2315. That is, the sealing member 2322 has a second limiting groove 2322d on the surface of the sealing member 2322 facing the valve cover 2315 in the thickness direction X of the wall. In another embodiment, the sealing member 2322 has a second guide post 2322c protruding on the side facing the valve cover 2315, in which case the second limiting groove 2322d is provided on the surface of the sealing member 2322 with the second guide post 2322c protruding.

[0346] The end of the elastic element 2321 away from the valve cover 2315 is inserted into the second limiting groove 2322d, that is, the end of the elastic element 2321 away from the valve cover 2315 abuts against the bottom surface of the second limiting groove 2322d.

[0347] For example, the elastic element 2321 is a spring, and the corresponding second limiting groove 2322d is an annular groove structure. In an embodiment where the second guide post 2322c protrudes from the side of the sealing element 2322 facing the valve cover 2315, the second limiting groove 2322d is arranged around the outside of the second guide post 2322c.

[0348] In an exemplary embodiment where the sealing member 2322 includes a pressing portion 2322a and a sealing portion 2322b, see [reference needed]. Figure 7 and Figure 8 As shown, the second limiting groove 2322d is provided on the surface of the clamping part 2322a facing the valve cover 2315.

[0349] By providing a second limiting groove 2322d for the insertion of the elastic element 2321 on the side of the sealing element 2322 facing the valve cover 2315, the end of the elastic element 2321 that abuts against the sealing element 2322 can be limited, thereby reducing the phenomenon of relative radial slippage between the elastic element 2321 and the sealing element 2322. This can improve the balance of the elastic force of the elastic element 2321 acting on the sealing element 2322, which is beneficial to improving the reliability of the elastic element 2321.

[0350] According to some embodiments of this application, the end of the elastic member 2321 away from the valve cover 2315 is fixedly connected to the sealing member 2322.

[0351] The structure in which the elastic element 2321 and the sealing element 2322 are fixedly connected can be of various types, such as welding or bonding.

[0352] It should be noted that in the embodiment where a second limiting groove 2322d is provided on the side of the sealing member 2322 facing the valve cover 2315, and the end of the elastic member 2321 away from the valve cover 2315 is inserted into the second limiting groove 2322d, the end of the elastic member 2321 away from the valve cover 2315 is fixedly connected to the bottom surface of the second limiting groove 2322d; in the embodiment where a second limiting groove 2322d is not provided on the side of the sealing member 2322 facing the valve cover 2315, the end of the elastic member 2321 away from the valve cover 2315 is fixedly connected to the surface of the sealing member 2322 that abuts against it.

[0353] By fixing the end of the elastic element 2321 away from the valve cover 2315 to the sealing element 2322, the end of the elastic element 2321 that abuts against the sealing element 2322 and the sealing element 2322 are fixedly connected to each other. This improves the stability of the elastic element 2321 against the sealing element 2322, further reduces the phenomenon of relative slippage between the elastic element 2321 and the sealing element 2322, and further improves the balance of the elastic force of the elastic element 2321 acting on the sealing element 2322.

[0354] According to some embodiments of this application, see Figure 7 and Figure 8 As shown, the sealing element 2322 is spaced apart from the cavity side of the mounting cavity 2311.

[0355] The sealing element 2322 is spaced apart from the side of the mounting cavity 2311, meaning there is a gap between the sealing element 2322 and the side of the mounting cavity 2311. In other words, the sealing element 2322 does not abut against the side of the mounting cavity 2311.

[0356] By spaced apart from the side of the mounting cavity 2311, the friction between the sealing element 2322 and the side of the mounting cavity 2311 can be reduced when the sealing element 2322 opens or blocks the air inlet 2312 along the thickness direction X of the wall. This reduces the possibility of the sealing element 2322 getting stuck or moving unevenly, and improves the reliability of the one-way valve 23.

[0357] Of course, the structure of the one-way valve 23 is not limited to this; for example, in some embodiments, refer to Figure 14 and Figure 15 , Figure 14 A cross-sectional view of the check valve 23 provided in some further embodiments of this application. Figure 15 This is a schematic diagram of the sealing member 2322 of the one-way valve 23 provided in some embodiments of this application. The outer peripheral surface of the sealing member 2322 is provided with a plurality of limiting protrusions 2322e, which are arranged at intervals along the circumference of the sealing member 2322. The limiting protrusions 2322e are guided and engaged with the cavity side surface of the mounting cavity 2311.

[0358] The limiting protrusion 2322e is guided and engaged with the side surface of the mounting cavity 2311. That is, the limiting protrusion 2322e is used to cooperate with the cavity wall surface of the mounting cavity 2311 when the sealing member 2322 moves along the thickness direction X of the wall to play a guiding and limiting role.

[0359] For example, in Figure 14 In this configuration, the protrusion 2322e abuts against the wall surface of the mounting cavity 2311 when the sealing member 2322 moves along the thickness direction X of the wall portion, serving as a guide and limiting element. Of course, in other embodiments, the one-way valve 23 can also have other structures. For example, the side of the mounting cavity 2311 may have a guide groove extending along the thickness direction X of the wall portion, and the limiting protrusion 2322e extends into the guide groove. The limiting protrusion 2322e can move along the thickness direction X of the guide groove when the sealing member 2322 opens the air inlet 2312, serving as a guide and limiting element. Multiple guide grooves extending along the thickness direction X of the wall portion can be provided, and each guide groove cooperates with a multiple limiting protrusion 2322e.

[0360] In an exemplary embodiment where the sealing member 2322 includes a pressing portion 2322a and a sealing portion 2322b, see [reference needed]. Figure 7 and Figure 8 As shown, the limiting protrusion 2322e protrudes from the outer peripheral surface of the pressing part 2322a.

[0361] Optionally, the shape of the limiting protrusion 2322e can be various, such as a semi-circular, triangular, trapezoidal, or rectangular structure. For example, in... Figure 15 In the middle, the shape of the limiting protrusion 2322e is semi-circular.

[0362] By providing multiple spaced limiting protrusions 2322e on the outer peripheral surface of the sealing member 2322, and having the limiting protrusions 2322e guide and cooperate with the cavity side of the mounting cavity 2311, the sealing member 2322 moves along the thickness direction X of the wall portion. The cooperation between the limiting protrusions 2322e and the cavity side of the mounting cavity 2311 provides guidance and limiting effects, thereby improving the stability of the sealing member 2322 moving along the thickness direction X of the wall portion.

[0363] According to some embodiments of this application, see Figure 7 and Figure 8 As shown, the sealing member 2322 may include a pressing part 2322a and a sealing part 2322b. Along the thickness direction X of the wall, the two ends of the elastic member 2321 abut against the valve cover 2315 and the pressing part 2322a respectively. The sealing part 2322b is connected to the side of the pressing part 2322a away from the valve cover 2315. The sealing part 2322b is used to block the air inlet 2312.

[0364] The elastic element 2321 has two ends abutting against the valve cover 2315 and the pressing part 2322a respectively. The sealing part 2322b is connected to the side of the pressing part 2322a away from the valve cover 2315. That is, the elastic element 2321 is disposed between the valve cover 2315 and the pressing part 2322a along the thickness direction X of the wall, so that the elastic element 2321 can provide elastic force to the pressing part 2322a, so that the pressing part 2322a can press against the sealing part 2322b, thereby sealing the air inlet 2312 through the sealing part 2322b.

[0365] Optionally, the rigidity of the clamping part 2322a is greater than that of the sealing part 2322b, meaning the deformation resistance of the clamping part 2322a is greater than that of the sealing part 2322b. This allows the clamping part 2322a to better press the sealing part 2322b against the bottom surface of the mounting cavity 2311, thereby sealing the air inlet 2312. For example, the clamping part 2322a can be made of various materials, such as steel, iron, or aluminum. Similarly, the sealing part 2322b can also be made of various materials, such as rubber, silicone, or plastic.

[0366] Alternatively, the connection structure between the clamping part 2322a and the sealing part 2322b can be various, such as snap-fit, bolt connection or adhesive connection.

[0367] By configuring the sealing member 2322 into two parts, including a pressing part 2322a and a sealing part 2322b, with the pressing part 2322a disposed on the side of the sealing part 2322b facing the valve cover 2315 and the sealing part 2322b used to block the air inlet 2312, and with both ends of the elastic member 2321 abutting against the valve cover 2315 and the pressing part 2322a respectively, the elastic member 2321 can apply elastic force to the sealing part 2322b through the pressing part 2322a, thereby improving the balance of the elastic force applied by the elastic member 2321 to the sealing part 2322b, and thus effectively improving the sealing effect of the sealing part 2322b on the air inlet 2312.

[0368] According to some embodiments of this application, please continue to refer to Figure 7 and Figure 8 As shown, the pressing part 2322a has a first abutting surface 2322f facing the sealing part 2322b, and the sealing part 2322b has a second abutting surface 2322g facing the pressing part 2322a. One of the first abutting surface 2322f and the second abutting surface 2322g is provided with a snap-fit ​​groove 2322h, and the other is provided with a snap-fit ​​part 2322k. The snap-fit ​​part 2322k engages with the snap-fit ​​groove 2322h.

[0369] The first contact surface 2322f of the pressing part 2322a and the second contact surface 2322g of the sealing part 2322b abut against each other, and both the first contact surface 2322f and the second contact surface 2322g are planes perpendicular to the thickness direction X of the wall.

[0370] One of the first abutting surface 2322f and the second abutting surface 2322g is provided with a snap-fit ​​groove 2322h, and the other is provided with a snap-fit ​​part 2322k. The snap-fit ​​part 2322k engages with the snap-fit ​​groove 2322h. That is, the snap-fit ​​groove 2322h can also be provided on the first abutting surface 2322f of the pressing part 2322a, or it can be provided on the second abutting surface 2322g of the sealing part 2322b. For example, in Figure 8 In the middle, the snap-fit ​​part 2322k protrudes from the second abutting surface 2322g of the sealing part 2322b, and the snap-fit ​​groove 2322h is provided on the first abutting surface 2322f of the pressing part 2322a. The snap-fit ​​part 2322k snaps into the snap-fit ​​groove 2322h.

[0371] For example, the snap-fit ​​part 2322k is a circular cylindrical structure, and the corresponding snap-fit ​​groove 2322h is a circular groove.

[0372] The pressing part 2322a and the sealing part 2322b have a first abutting surface 2322f and a second abutting surface 2322g facing each other. By providing a snap-fit ​​groove 2322h on one of the first abutting surface 2322f and the second abutting surface 2322g, and providing a snap-fit ​​part 2322k on the other to snap-fit ​​with the snap-fit ​​groove 2322h, the structural stability of the sealing part 2322b on the pressing part 2322a can be improved, thereby reducing the phenomenon of radial slippage of the sealing part 2322b relative to the pressing part 2322a. This is beneficial to improving the sealing effect of the sealing part 2322b on the air inlet 2312, thereby reducing the phenomenon of the air inlet 2312 being accidentally opened.

[0373] In some embodiments, the sealing portion 2322b is bonded to the pressing portion 2322a.

[0374] The adhesive structure connects the sealing part 2322b and the pressing part 2322a. On the one hand, it can improve the structural stability of the sealing part 2322b connected to the pressing part 2322a, which helps to reduce the risk of the sealing part 2322b and the pressing part 2322a detaching from each other, thereby improving the reliability of the sealing part 2322b in blocking the air inlet 2312. On the other hand, it facilitates the assembly connection between the sealing part 2322b and the pressing part 2322a, which helps to reduce the assembly difficulty between the sealing part 2322b and the pressing part 2322a.

[0375] In some embodiments, the material of the sealing part 2322b includes EPDM, fluororubber, or Teflon.

[0376] The sealing part 2322b, made of EPDM, fluororubber, or Teflon, has good corrosion resistance and can effectively alleviate the corrosion of the sealing part 2322b by the electrolyte, thereby helping to extend the service life of the sealing part 2322b and reducing the phenomenon that the sealing part 2322b will not effectively block the air inlet 2312 due to corrosion.

[0377] According to some embodiments of this application, see Figure 8 As shown, along the thickness direction X of the wall, the size of the gap between the valve cover 2315 and the sealing member 2322 is L, which satisfies 0mm<L≤2mm.

[0378] The gap between the valve cover 2315 and the sealing member 2322 is L, that is, the distance between the valve cover 2315 and the sealing member 2322 in the thickness direction X of the wall is L.

[0379] For example, the size L of the gap between the valve cover 2315 and the sealing member 2322 can be 0mm, 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.2mm, 1.5mm, 1.8mm or 2mm, etc.

[0380] It should be noted that, in the embodiment where the valve cover 2315 has a protruding first guide post 2315b and the sealing member 2322 has a protruding second guide post 2322c, L is the dimension of the gap formed between the first guide post 2315b and the second guide post 2322c in the thickness direction X of the wall portion; in the embodiment where the valve cover 2315 has a protruding first guide post 2315b and the sealing member 2322 does not have a protruding second guide post 2322c, L is the dimension of the gap formed between the first guide post 2315b and the surface of the sealing member 2322 facing the valve cover 2315 in the thickness direction X of the wall portion; in the embodiment where the valve cover 2315 does not have a protruding first guide post 2315b and the sealing member 2322 has a protruding second guide post 2322c, L is the dimension of the gap formed between the second guide post 2322c and the surface of the valve cover 2315 facing the sealing member 2322 in the thickness direction X of the wall portion.

[0381] By setting the gap between the valve cover 2315 and the sealing member 2322 in the thickness direction X of the wall to be greater than 0 mm and less than or equal to 2 mm, on the one hand, the obstruction of the sealing member 2322 by the valve cover 2315 can be reduced, so that there is space between the valve cover 2315 and the sealing member 2322 for the sealing member 2322 to move along the thickness direction X of the wall. Thus, when the gas inside the housing 21 pushes the sealing member 2322, the sealing member 2322 can open the air inlet 2312 to exhaust gas. On the other hand, it can alleviate the phenomenon that the one-way valve 23 occupies too much space in the thickness direction X of the wall due to the excessive gap between the valve cover 2315 and the sealing member 2322, thereby improving the space utilization rate of the battery cell 20.

[0382] According to some embodiments of this application, see Figure 5 As shown, the valve body 2314 is welded to the wall 211.

[0383] The wall portion 211 is provided with a mounting hole 2111 for mounting the valve body 2314, and the valve body 2314 is welded to the wall surface of the mounting hole 2111. Of course, in other embodiments, the valve body 2314 may also be welded to the surface of the wall portion 211 opposite to the electrode assembly 22 or to the surface of the wall portion 211 facing the electrode assembly 22.

[0384] By welding the valve body 2314 to the wall 211, the structural stability and strength of the valve body 2314 connected to the wall 211 can be effectively improved, thereby reducing the risk of the valve body 2314 falling off from the wall 211 during use.

[0385] According to some embodiments of this application, refer to Figure 5 , Figure 7 and Figure 8 Please refer to further details. Figure 16 , Figure 16 This is a partial cross-sectional view of the wall 211 of the housing 21 of the battery cell 20 provided in some embodiments of this application. The wall 211 is provided with a mounting hole 2111, and at least a portion of the valve body 2314 is accommodated in the mounting hole 2111. The wall surface of the mounting hole 2111 includes a first connecting surface 2111a, and the valve body 2314 includes a second connecting surface 2314b. Both the first connecting surface 2111a and the second connecting surface 2314b are arranged around the central axis of the mounting hole 2111, and the first connecting surface 2111a and the second connecting surface 2314b are welded together.

[0386] The mounting hole 2111 provided on the wall portion 211 connects the interior and exterior of the housing 21. At least a portion of the valve body 2314 is accommodated within the mounting hole 2111. That is, the valve body 2314 of the one-way valve 23 can be entirely located within the mounting hole 2111, or it can be only partially located within the mounting hole 2111. For example, in Figure 5 In the middle, a portion of the valve body 2314 is located inside the mounting hole 2111, and the valve body 2314 protrudes from the surface of the wall portion 211 facing the electrode assembly 22 along the thickness direction X of the wall portion.

[0387] The wall surface of the mounting hole 2111 includes a first connecting surface 2111a, and the valve body 2314 includes a second connecting surface 2314b. The first connecting surface 2111a and the second connecting surface 2314b are welded together, that is, the part of the valve body 2314 located inside the mounting hole 2111 is welded together with the wall surface of the mounting hole 2111.

[0388] The first connecting surface 2111a and the second connecting surface 2314b are both arranged around the central axis of the mounting hole 2111. That is, the first connecting surface 2111a and the second connecting surface 2314b are both annular structures, and the central axes of the first connecting surface 2111a and the second connecting surface 2314b are collinear with the central axis of the mounting hole 2111, so that the first connecting surface 2111a and the second connecting surface 2314b are welded together to form a weld mark of an annular structure.

[0389] The wall portion 211 is provided with a mounting hole 2111 for accommodating the valve body 2314 of the valve body 231, and the valve body 2314 has a second connecting surface 2314b. The second connecting surface 2314b is welded to the first connecting surface 2111a of the hole wall of the mounting hole 2111, so as to realize the one-way valve 23 is assembled onto the wall portion 211. The structure of welding the first connecting surface 2111a and the second connecting surface 2314b, which are both annular, can improve the connection reliability between the valve body 2314 and the wall portion 211, and can also improve the sealing effect between the valve body 2314 and the hole wall of the mounting hole 2111.

[0390] According to some embodiments of this application, see Figure 5 , Figure 8 and Figure 16 As shown, the first connecting surface 2111a and the second connecting surface 2314b are fitted together, and both the first connecting surface 2111a and the second connecting surface 2314b are set at an acute angle to the central axis of the mounting hole 2111.

[0391] The first connecting surface 2111a and the second connecting surface 2314b are fitted together, that is, the first connecting surface 2111a and the second connecting surface 2314b have the same shape and abut against each other.

[0392] Both the first connecting surface 2111a and the second connecting surface 2314b are set at an acute angle to the central axis of the mounting hole 2111, that is, both the first connecting surface 2111a and the second connecting surface 2314b are inclined surfaces. In other words, on the cross section of the valve body 2314 parallel to the thickness direction X of the wall, the cross section line formed by the first connecting surface 2111a and the second connecting surface 2314b is collinear and set at an acute angle to the thickness direction X of the wall.

[0393] For example, in Figure 5 and Figure 8 In the second connecting surface 2314b, the end of the second connecting surface 2314b that is farther from the electrode assembly 22 in the thickness direction X of the wall portion is farther from the central axis of the mounting hole 2111 than the end of the second connecting surface 2314b that is farther from the electrode assembly 22 in the thickness direction X of the wall portion. Similarly, in Figure 5 and Figure 16 In the first connecting surface 2111a, the end of the first connecting surface 2111a that is farther away from the electrode assembly 22 in the thickness direction X of the wall is farther away from the central axis of the mounting hole 2111 than the end of the first connecting surface 2111a that is farther away from the electrode assembly 22 in the thickness direction X of the wall.

[0394] By setting the first connecting surface 2111a and the second connecting surface 2314b to a mutually fitting structure, and both the first connecting surface 2111a and the second connecting surface 2314b are set at an acute angle to the central axis of the mounting hole 2111, the first connecting surface 2111a and the second connecting surface 2314b have the same shape and abut against each other. Furthermore, both the first connecting surface 2111a and the second connecting surface 2314b are inclined structures. This facilitates the abutment of the first connecting surface 2111a and the second connecting surface 2314b when the valve body 2314 is assembled into the mounting hole 2111, and improves the tightness of the fit between the first connecting surface 2111a and the second connecting surface 2314b. This helps to reduce the gap between the first connecting surface 2111a and the second connecting surface 2314b, thereby effectively improving the welding quality of the first connecting surface 2111a and the second connecting surface 2314b.

[0395] According to some embodiments of this application, please continue to refer to Figure 5 , Figure 8 and Figure 16 As shown, the mounting hole 2111 includes a first hole segment 2111b and a second hole segment 2111c. The first hole segment 2111b and the second hole segment 2111c are arranged along the thickness direction X of the wall, and the first hole segment 2111b is located on the side of the second hole segment 2111c away from the electrode assembly 22. The diameter of the first hole segment 2111b is larger than the diameter of the second hole segment 2111c. The hole wall surface of the first hole segment 2111b is a first connecting surface 2111a. The valve body 2314 has a connecting portion 2314c located in the first hole segment 2111b, and the outer peripheral surface of the connecting portion 2314c is a second connecting surface 2314b.

[0396] The diameter of the first hole segment 2111b is larger than that of the second hole segment 2111c, meaning that the mounting hole 2111 has a stepped hole structure. The first hole segment 2111b is located on the side of the second hole segment 2111c away from the electrode assembly 22, meaning that the mounting hole 2111 has a stepped hole structure with the diameter gradually increasing from the end closer to the electrode assembly 22 to the end farther away from the electrode assembly 22.

[0397] The wall surface of the first hole segment 2111b is the first connecting surface 2111a. The valve body 2314 has a connecting portion 2314c located in the first hole segment 2111b. The outer peripheral surface of the connecting portion 2314c is the second connecting surface 2314b. That is, the valve body 2314 of the valve body 231 has a connecting portion 2314c with an annular structure extending circumferentially along the first hole segment 2111b. The connecting portion 2314c is accommodated in the first hole segment 2111b, and the outer peripheral surface of the connecting portion 2314c is welded to the wall surface of the first hole segment 2111b.

[0398] For example, the outer peripheral surface of the connecting part 2314c is connected to the end face of the valve body 2314 away from the electrode assembly 22, that is, the second connecting surface 2314b is connected to the end face of the valve body 2314 away from the electrode assembly 22.

[0399] The mounting hole 2111 is provided with a first hole segment 2111b and a second hole segment 2111c arranged along the thickness direction X of the wall portion. The first hole segment 2111b is located on the outside of the second hole segment 2111c away from the electrode assembly 22, and the diameter of the first hole segment 2111b is larger than the diameter of the second hole segment 2111c, forming a stepped hole structure in the mounting hole 2111. The hole wall surface of the first hole segment 2111b is set as the first connecting surface 2111a, and the valve body 2314 has a connecting portion 2314c accommodated in the first hole segment 2111b. The outer peripheral surface of 4c is the second connecting surface 2314b, which facilitates the assembly of the valve body 2314 from the outside of the wall portion 211 into the mounting hole 2111. After the connecting portion 2314c of the valve body 2314 is accommodated in the first hole section 2111b, the first connecting surface 2111a can abut against the second connecting surface 2314b. Thus, the mounting hole 2111 and the connecting portion 2314c with the stepped hole structure can cooperate to play a certain limiting and positioning role for the valve body 2314, which helps to reduce the difficulty of assembling the valve body 2314 into the mounting hole 2111.

[0400] According to some embodiments of this application, see Figure 5 , Figure 7 and Figure 8 As shown, along the thickness direction X of the wall, the end face of the valve body 2314 away from the electrode assembly 22 is connected to the second connecting surface 2314b, and a first stress relief groove 2314d is provided on the end face of the valve body 2314 away from the electrode assembly 22.

[0401] For example, a first stress relief groove 2314d is provided on the surface of the connection portion 2314c of the valve body 2314 on the side opposite to the electrode assembly 22.

[0402] It should be noted that, in other embodiments, a second stress relief groove may be provided on the first surface 2112 or the second surface 2114 of the wall portion 211. The second stress relief groove is an annular groove structure and is arranged around the mounting hole 2111 to absorb the welding stress generated by the welding connection between the valve body 2314 and the wall portion 211. In some embodiments, the first stress relief groove 2314d and the second stress relief groove may be provided simultaneously.

[0403] By providing a first stress relief groove 2314d on the end face of the valve body 2314 away from the electrode assembly 22 along the thickness direction X of the wall, the welding stress generated by the welding of the first connecting surface 2111a and the second connecting surface 2314b can be released through the first stress relief groove 2314d. This reduces the influence of welding stress on the weld connecting the first connecting surface 2111a and the second connecting surface 2314b, reduces the risk of weld cracking, and thus reduces the risk of seal failure at the weld.

[0404] In some embodiments, please continue to see Figure 6 , Figure 7 and Figure 8 As shown, the first stress relief groove 2314d is arranged around the central axis of the mounting hole 2111. That is, the first stress relief groove 2314d is an annular groove structure. For example, the first stress relief groove 2314d is arranged around the outside of the valve cover 2315.

[0405] By setting the first stress relief groove 2314d as an annular structure surrounding the central axis of the mounting hole 2111, the absorption effect of the first stress relief groove 2314d on the welding stress generated by the welding of the first connecting surface 2111a and the second connecting surface 2314b of the annular structure is improved, so as to further reduce the impact of welding stress on other components such as the valve core 232 of the one-way valve 23.

[0406] According to some embodiments of this application, see Figure 4 and Figure 5 As shown, the battery cell 20 may further include an insulating member 26, which is disposed on the side of the wall portion 211 facing the electrode assembly 22. Along the thickness direction X of the wall portion, the wall portion 211 has a second surface 2114 facing the electrode assembly 22, and a one-way valve 23 protrudes from the second surface 2114. The insulating member 26 includes a body portion 261 and a receiving portion 262. The body portion 261 is disposed on the side of the wall portion 211 facing the electrode assembly 22, and the receiving portion 262 is connected to the body portion 261. The portion of the one-way valve 23 extending into the housing 21 is received within the receiving portion 262.

[0407] The insulating member 26 is disposed on the side of the wall portion 211 facing the electrode assembly 22. The insulating member 26 serves to separate the wall portion 211 from the electrode assembly 22, thereby insulating and isolating the wall portion 211 from the electrode assembly 22.

[0408] For example, the insulating element 26 can be made of various materials, such as rubber, silicone, or plastic.

[0409] The wall portion 211 has a second surface 2114 facing the electrode assembly 22, and a one-way valve 23 protrudes from the second surface 2114. That is, the one-way valve 23 is disposed within the mounting hole 2111, and the one-way valve 23 extends out of the second surface 2114 along the thickness direction X of the wall portion. For example, in Figure 5 In the middle, the valve body 2314 of the valve body 231 of the one-way valve 23 protrudes from the second surface 2114.

[0410] The portion of the one-way valve 23 extending into the housing 21 is housed within the receiving portion 262. That is, the insulating member 26 has a receiving portion 262 formed at the position corresponding to the one-way valve 23, and the receiving portion 262 covers the outer side of the portion of the one-way valve 23 that protrudes from the second surface 2114.

[0411] Optionally, the body portion 261 and the receiving portion 262 of the insulating member 26 can be an integral structure or a separate structure. When the body portion 261 and the receiving portion 262 are an integral structure, the body portion 261 and the receiving portion 262 can be integrally formed by processes such as injection molding or milling. When the body portion 261 and the receiving portion 262 are separate structures, the receiving portion 262 can be connected to the body portion 261 by means of bonding or snap-fitting.

[0412] The battery cell 20 is also provided with an insulating member 26, which includes a body portion 261 and a receiving portion 262 connected to each other. The body portion 261 is disposed on the side of the wall portion 211 facing the electrode assembly 22, so that the wall portion 211 and the electrode assembly 22 can be insulated and isolated by the body portion 261. The receiving portion 262 accommodates the portion of the one-way valve 23 that protrudes from the second surface 2114 of the wall portion 211, which can avoid and protect the one-way valve 23, and can insulate and isolate the electrode assembly 22 and the one-way valve 23, so as to reduce the risk of short circuit between the one-way valve 23 and the electrode assembly 22.

[0413] According to some embodiments of this application, see Figure 5 As shown, the one-way valve 23 includes a valve body 231. Along the thickness direction X of the wall, the valve body 231 protrudes from the second surface 2114, and the portion of the valve body 231 protruding from the second surface 2114 is provided with an air inlet 2312, which is configured to allow gas inside the housing 21 to be discharged. The receiving portion 262 is provided with a second through hole 2621, which communicates with the air inlet 2312.

[0414] The receiving part 262 is provided with a second through hole 2621, and the second through hole 2621 penetrates the receiving part 262, so that the second through hole 2621 can connect the interior of the receiving part 262 and the interior of the outer shell 21, so that the air inlet 2312 of the valve body 231 can connect to the interior of the outer shell 21 through the second through hole 2621.

[0415] By providing a second through hole 2621 on the receiving part 262, the second through hole 2621 can connect the interior of the outer shell 21 and the interior of the receiving part 262. This allows the air inlet 2312 of the valve body 231 of the one-way valve 23 to communicate with the interior of the outer shell 21 through the second through hole 2621. This enables the gas inside the outer shell 21 to enter the receiving part 262 through the second through hole 2621 and then exit the outer shell 21 through the one-way valve 23. This eliminates the need for the gas to enter the receiving part 262 through the gap between the body part 261 and the wall part 211 and then exit through the one-way valve 23, thus improving the smoothness of the one-way valve 23 in discharging the gas inside the outer shell 21.

[0416] According to some embodiments of this application, refer to Figure 5 Please refer to further details. Figure 17 , Figure 17 This is a partial cross-sectional view of the insulating member 26 of the battery cell 20 provided in some embodiments of this application. Along the thickness direction X of the wall portion, an air inlet 2312 is provided at one end of the valve body 231 facing the electrode assembly 22. The receiving portion 262 includes a first wall 2622 and a second wall 2623. The first wall 2622 surrounds the valve body 231. Along the thickness direction X of the wall portion, one end of the first wall 2622 is connected to the body portion 261, and the second wall 2623 is connected to the end of the first wall 2622 away from the body portion 261. A second through hole 2621 is provided in the second wall 2623.

[0417] Along the thickness direction X of the wall, the air inlet 2312 is located at the end of the valve body 231 facing the electrode assembly 22, that is, the air inlet 2312 is located on the bottom surface of the mounting cavity 2311 opposite to the valve cover 2315.

[0418] The first wall 2622 is arranged around the valve body 231, that is, the first wall 2622 of the receiving part 262 is an annular structure arranged around the valve body 231.

[0419] One end of the first wall 2622 is connected to the main body 261, and the second wall 2623 is connected to the end of the first wall 2622 away from the main body 261. That is, the second wall 2623 is connected to the main body 261 through the first wall 2622, and the second wall 2623 and the first wall 2622 together enclose a receiving part 262 for accommodating the valve body 231. The second wall 2623 is a wall that faces the receiving part 262 and the air inlet 2312.

[0420] The second through hole 2621 is disposed on the second wall 2623, that is, the second through hole 2621 is disposed on the end of the receiving portion 262 facing the electrode assembly 22. Of course, in other embodiments, the second through hole 2621 may also be disposed on the first wall 2622, that is, the second through hole 2621 is disposed on the radial side of the receiving portion 262.

[0421] The receiving portion 262 is provided with a first wall 2622 and a second wall 2623 that are interconnected. The first wall 2622 surrounds the valve body 231, and the second wall 2623 is located at the end of the valve body 231 facing the electrode assembly 22 in the thickness direction X of the wall portion, so that the first wall 2622 and the second wall 2623 enclose to form the receiving portion 262 for accommodating the portion of the valve body 231 that extends into the housing 21. By setting the second through hole 2621 of the receiving portion 262 on the first wall 2622, it is beneficial to increase the path of gas from the second through hole 2621 into the air inlet 2312 of the valve body 231, so as to alleviate the phenomenon of electrolyte overflow with gas. By setting the second through hole 2621 of the receiving portion 262 on the second wall 2623, it is beneficial to realize that the air inlet 2312 and the second through hole 2621 are correspondingly arranged, so as to improve the smoothness of the one-way valve 23 discharging gas into the housing 21.

[0422] According to some embodiments of this application, see Figure 5 and Figure 17 As shown, the receiving part 262 and the main body part 261 are integrally formed. That is to say, the receiving part 262 and the main body part 261 are a single structure.

[0423] By making the body portion 261 and the receiving portion 262 of the insulating member 26 an integrally formed structure, it is beneficial to improve the structural strength and structural stability of the receiving portion 262 connected to the body portion 261.

[0424] Of course, the structure of the insulating element 26 is not limited to this; the insulating element 26 can also have other structures, for example, see reference. Figure 18 and Figure 19 , Figure 18 This is a partial cross-sectional view of a battery cell 20 provided in some embodiments of this application. Figure 19 This is a partial cross-sectional view of the insulating member 26 of the battery cell 20 provided in some embodiments of this application. The receiving portion 262 and the body portion 261 are separately provided. That is, the receiving portion 262 and the body portion 261 are separate structures.

[0425] By setting the body portion 261 and the receiving portion 262 of the insulating member 26 as separate parts, it is beneficial to reduce the processing difficulty of the insulating member 26 and thus reduce the manufacturing cost of the insulating member 26.

[0426] According to some embodiments of this application, please continue to refer to Figure 18 and Figure 19As shown, in an embodiment where the body portion 261 and the receiving portion 262 of the insulating member 26 are separate structures, the receiving portion 262 may further include a flange portion 2624. The flange portion 2624 is connected to the end of the first wall 2622 away from the second wall 2623. At least a portion of the flange portion 2624 is stacked with the body portion 261, and the flange portion 2624 abuts against the side of the body portion 261 facing the wall portion 211.

[0427] At least a portion of the flanged portion 2624 is stacked on top of the main body portion 261, and the flanged portion 2624 abuts against the side of the main body portion 261 facing the wall portion 211. That is, the flanged portion 2624 is located on the side of the main body portion 261 facing the wall portion 211, and the flanged portion 2624 and the main body portion 261 abut against each other along the thickness direction X of the wall portion, so that the flanged portion 2624 and the second wall 2623 are respectively located on both sides of the main body portion 261, so that the receiving portion 262 can be snapped onto the main body portion 261. Of course, in other embodiments, the flanged portion 2624 of the receiving portion 262 may also be located on the side of the main body portion 261 away from the wall portion 211, and the flanged portion 2624 and the main body portion 261 are connected by adhesive.

[0428] exist Figure 19 In the middle, the main body 261 has an assembly hole 2611, which penetrates through both sides of the main body 261 along the thickness direction X of the wall. The first wall 2622 of the receiving part 262 passes through the assembly hole 2611, so that the flange 2624 and the second wall 2623 are located on both sides of the main body 261 respectively.

[0429] For example, the thickness direction of the flange 2624 and the thickness direction of the second wall 2623 are both the same as the thickness direction X of the wall, and the flange 2624 is an annular structure surrounding the outer side of the first wall 2622. Of course, in other embodiments, the flange 2624 may also be a plurality of protruding structures protruding from the outer side of the first wall 2622.

[0430] The receiving portion 262 is also provided with a flange portion 2624. By connecting the flange portion 2624 to the end of the first wall 2622 away from the second wall 2623, at least a portion of the flange portion 2624 is stacked with the body portion 261 in the thickness direction X of the wall portion, and the flange portion 2624 abuts against the side of the body portion 261 facing the wall portion 211, so that the receiving portion 262 is connected to the body portion 261. The structure is simple and easy to assemble.

[0431] According to some embodiments of this application, see Figure 18 and Figure 19 As shown, along the thickness direction X of the wall portion, the surface of the main body portion 261 facing the wall portion 211 is provided with a receiving groove 2612, and the flange portion 2624 is received in the receiving groove 2612.

[0432] The receiving groove 2612 is provided on the surface of the main body 261 away from the electrode assembly 22, and the receiving groove 2612 penetrates the hole wall of the mounting hole 2611, so that the flange 2624 can be accommodated in the receiving groove 2612 and overlap the bottom surface of the receiving groove 2612.

[0433] By providing a receiving groove 2612 for accommodating the flange 2624 on the surface of the body portion 261 facing the wall portion 211, it is possible to reduce the space occupied by the flange 2624 and the body portion 261 in the thickness direction X of the wall portion, and to reduce the interference effect caused by the flange 2624 on the contact between the body portion 261 and the wall portion 211.

[0434] In some embodiments, please continue to see Figure 18 and Figure 19 As shown, along the thickness direction X of the wall portion, the surface of the flange portion 2624 facing the wall portion 211 is flush with the surface of the body portion 261 facing the wall portion 211.

[0435] The surface of the flange 2624 facing the wall 211 is flush with the surface of the body 261 facing the wall 211, that is, the dimension of the flange 2624 in the thickness direction X of the wall is the same as the groove depth of the receiving groove 2612.

[0436] Optionally, the surface of the body facing the wall 211 is used to abut against the wall 211, such that the flange 2624 is clamped between the wall 211 and the bottom surface of the receiving groove 2612 along the thickness direction X of the wall.

[0437] By setting the surface of the flange 2624 facing the wall 211 and the surface of the body 261 facing the wall 211 to be flush with each other, the bottom surfaces of the wall 211 and the receiving groove 2612 can cooperate to clamp and limit the flange 2624, thereby reducing the phenomenon of the receiving part 262 moving along the thickness direction X of the wall.

[0438] According to some embodiments of this application, refer to Figure 4 , Figure 5 and Figure 6 Please refer to further details. Figure 20 , Figure 21 and Figure 22 , Figure 20 This is a top view of a battery cell 20 (after removing the protective patch 29) provided in some embodiments of this application. Figure 21 for Figure 20 A magnified view of part A of the battery cell 20 shown. Figure 22This is a schematic diagram showing the connection between the shielding member 27 and the wall portion 211 of the battery cell 20 provided in some embodiments of this application. The battery cell 20 may further include the shielding member 27, which is mounted on the wall portion 211. Along the thickness direction X of the wall portion, the shielding member 27 is located on the side of the one-way valve 23 away from the electrode assembly 22, and covers the one-way valve 23. The one-way valve 23 has an outlet 2313 for discharging gas from inside the housing 21. An exhaust channel 28 is formed between the shielding member 27 and the wall portion 211, or an exhaust channel 28 is provided on the shielding member 27. The exhaust channel 28 connects the outlet 2313 and the outside of the housing 21.

[0439] The structure of the shielding member 27 installed on the wall portion 211 can be various. For example, the shielding member 27 can be installed on the wall portion 211 by welding, interference fit, bolting, snap-fit ​​or bonding.

[0440] The shielding member 27 is located on the side of the one-way valve 23 away from the electrode assembly 22. The shielding member 27 covers the one-way valve 23. That is, the shielding member 27 and the one-way valve 23 are arranged along the thickness direction X of the wall, and the projection of the one-way valve 23 in the thickness direction X of the wall is located inside the shielding member 27.

[0441] An exhaust passage 28 is formed between the shield 27 and the wall portion 211, or an exhaust passage 28 is provided on the shield 27. The exhaust passage 28 connects the air outlet 2313 and the outside of the housing 21. That is, the air outlet 2313 of the one-way valve 23 is connected to the outside of the housing 21 through the exhaust passage 28, so that the one-way valve 23 can discharge the gas inside the housing 21. The exhaust passage 28 can be provided on the shield 27, that is, the exhaust passage 28 is a through hole provided on the shield 27, or the exhaust passage 28 can be formed between the shield 27 and the wall portion 211, that is, the exhaust passage 28 is a gap formed between the shield 27 and the wall portion 211.

[0442] For example, in Figure 21 and Figure 22 In the middle, the exhaust passage 28 is formed between the shield 27 and the wall portion 211, that is, the exhaust passage 28 is formed in the gap between the shield 27 and the wall portion 211.

[0443] The battery cell 20 is also provided with a shielding member 27 located on the side of the one-way valve 23 away from the electrode assembly 22. The shielding member 27 is installed on the wall portion 211 and covers the one-way valve 23. Thus, the shielding member 27 can provide a certain degree of protection and shielding for the one-way valve 23. On the one hand, it can reduce the wear or damage of the one-way valve 23 in the external environment and reduce the risk of impurities or particles in the external environment entering the one-way valve 23, which is conducive to improving the service life of the one-way valve 23. On the other hand, covering the one-way valve 23 with the shielding member 27 can improve the aesthetics of the outer surface of the battery cell 20. Furthermore, it is convenient to connect detection elements and other components on the side of the shielding member 27 away from the one-way valve 23, so as to reduce the interference of the area of ​​the wall portion 211 where the one-way valve 23 is located on the connection of detection elements and other components.

[0444] According to some embodiments of this application, see Figure 4 , Figure 5 and Figure 22 As shown, along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2112 facing away from the electrode assembly 22. The first surface 2112 is provided with a mounting groove 2113. The bottom surface of the mounting groove 2113 is provided with a mounting hole 2111. At least a portion of the one-way valve 23 is disposed in the mounting hole 2111, and at least a portion of the shielding member 27 is accommodated in the mounting groove 2113.

[0445] The first surface 2112 is provided with a mounting groove 2113, and the bottom surface of the mounting groove 2113 is provided with a mounting hole 2111, that is, the mounting hole 2111 penetrates the bottom surface of the mounting groove 2113, so that the mounting hole 2111 communicates with the outside of the outer shell 21 through the mounting groove 2113.

[0446] At least a portion of the shielding member 27 is accommodated within the mounting groove 2113; that is, the shielding member 27 may be entirely located within the mounting groove 2113, or it may only be partially located within the mounting groove 2113. For example, in... Figure 5 In the middle, the entire shielding component 27 is located within the mounting groove 2113.

[0447] By providing a mounting groove 2113 on the first surface 2112 of the wall portion 211 facing away from the electrode assembly 22, and at least a portion of the shielding member 27 is accommodated in the mounting groove 2113, on the one hand, the space occupied by the shielding member 27 and the wall portion 211 in the thickness direction X of the wall portion can be reduced, which is beneficial to optimizing the volume of the battery cell 20. On the other hand, the mounting groove 2113 can play a certain positioning and limiting role for the shielding member 27, which is beneficial to reducing the assembly difficulty of the shielding member 27 connecting to the wall portion 211.

[0448] According to some embodiments of this application, see Figure 20 , Figure 21 and Figure 22 As shown, the exhaust passage 28 includes a third exhaust gap 281, which is formed between the shield 27 and the side of the mounting groove 2113. The third exhaust gap 281 is used to connect the exhaust port 2313 and the outside of the housing 21.

[0449] The third exhaust gap 281 is used to connect the exhaust port 2313 and the outside of the housing 21. The third exhaust gap 281 can be directly connected to the exhaust port 2313. For example, at least a portion of the projection of the third exhaust gap 281 in the thickness direction X of the wall is located within the mounting hole 2111, allowing the exhaust port 2313 of the one-way valve 23 located within the mounting hole 2111 to be directly connected to the third exhaust gap 281. Alternatively, the third exhaust gap 281 can be indirectly connected to the exhaust port 2313, for example, in… Figure 22 In the process, the exhaust passage 28 may also include a fourth exhaust gap 282, which is formed between the shield 27 and the bottom surface of the mounting groove 2113. The fourth exhaust gap 282 connects the third exhaust gap 281 and the outlet 2313 of the one-way valve 23.

[0450] By forming a third exhaust gap 281 between the shield 27 and the side of the mounting groove 2113, which communicates with the outside of the housing 21, the gas discharged by the one-way valve 23 can be discharged to the outside of the housing 21 through the third exhaust gap 281. With this structure, the battery cell 20 does not need to have a hole opened on the shield 27, which helps to reduce the processing difficulty and improves the appearance of the battery cell 20.

[0451] It should be noted that the structure of the third exhaust gap 281 can be varied; in some embodiments, see [reference needed]. Figure 21 As shown, the outer peripheral surface of the shield 27 includes a first corner surface 271 and at least two first side surfaces 272, with the first corner surface 271 connecting two adjacent first side surfaces 272. The groove side surface of the mounting groove 2113 includes a second corner surface 2113a and at least two second side surfaces 2113b, with the second corner surface 2113a connecting two adjacent second side surfaces 2113b, and each second side surface 2113b connecting to a first side surface 272. A third exhaust gap 281 is formed between the second corner surface 2113a and the first corner surface 271.

[0452] The first corner surface 271 connects two adjacent first side surfaces 272. That is, in the circumferential direction of the shielding member 27, the first corner surface 271 is located between the two first side surfaces 272 and connects the two first side surfaces 272. In other words, the first corner surface 271 is the surface at the corner of the outer peripheral surface of the shielding member 27.

[0453] The second corner surface 2113a connects two adjacent second side surfaces 2113b. That is, in the circumferential direction of the mounting groove 2113, the second corner surface 2113a is located between the two second side surfaces 2113b and connects the two second side surfaces 2113b. In other words, the second corner surface 2113a is the surface at the corner of the side surface of the mounting groove 2113.

[0454] Each first side 272 of the shield 27 abuts against and connects with the corresponding second side 2113b of the mounting groove 2113, so that the first corner surface 271 of the shield 27 faces the second corner surface 2113a of the mounting groove 2113, thereby forming a third exhaust gap 281 between the first corner surface 271 and the second corner surface 2113a.

[0455] Optionally, the connection structure between the first side 272 and the second side 2113b can be various, such as welding, bonding or interference fit.

[0456] For example, in Figure 20 and Figure 21 In the design, both the shielding member 27 and the mounting groove 2113 are rectangular structures, such that four first corner surfaces 271 are formed at the four corners of the shielding member 27, and four second corner surfaces 2113a are formed at the four corners of the side of the mounting groove 2113, so that four third venting gaps 281 are formed between the shielding member 27 and the side of the mounting groove 2113.

[0457] Of course, the structure of the third vent gap 281 formed between the shield 27 and the side of the mounting groove 2113 is not limited to this. For example, in other embodiments, refer to Figure 23 , Figure 23 The diagram below illustrates the structure of the shielding member 27 provided in some embodiments of this application in other embodiments. A second groove 273 is provided on the outer peripheral surface of the shielding member 27, and the outer peripheral surface of the shielding member 27 is used to connect with the side surface of the mounting groove 2113 to form a third venting gap 281 between the bottom surface of the second groove 273 and the side surface of the mounting groove 2113. In this embodiment, the outer peripheral surface of the shielding member 27 can be welded or bonded to the side surface of the mounting groove 2113. Similarly, in other embodiments, refer to... Figure 24 , Figure 24The diagram below illustrates the structure of the shielding member 27 provided in some embodiments of this application in other embodiments. A plurality of abutment portions 274 protrude from the outer peripheral surface of the shielding member 27. These abutment portions 274 are arranged at intervals along the circumference of the shielding member 27, and are used to connect with the side surface of the mounting groove 2113 to form a third venting gap 281 between the area of ​​the shielding member 27 where no abutment portion 274 is provided and the side surface of the mounting groove 2113. In this embodiment, the abutment portion 274 and the side surface of the mounting groove 2113 can be an interference fit, welded, or bonded.

[0458] Two adjacent first side surfaces 272 on the outer peripheral surface of the shielding member 27 are connected by a first corner surface 271, and two connected second side surfaces 2113b on the groove side surface of the mounting groove 2113 are connected by a second corner surface 2113a. Each first side surface 272 is connected to a second side surface 2113b, and a third gap is formed between the first corner surface 271 and the second corner surface 2113a. That is, a third venting gap 281 is formed at the corner of the shielding member 27 and the mounting groove 2113. On the one hand, it is convenient to form a third venting gap 281 between the outer peripheral surface of the shielding member 27 and the groove side surface of the mounting groove 2113. The structure is simple and easy to implement. On the other hand, while forming a third venting gap 281 between the outer peripheral surface of the shielding member 27 and the groove side surface of the mounting groove 2113, it is beneficial to increase the connection area between the outer peripheral surface of the shielding member 27 and the groove side surface of the mounting groove 2113, which is beneficial to improve the firmness of the shielding member 27 connected to the wall portion 211.

[0459] According to some embodiments of this application, see Figure 20 and Figure 21 As shown, both the first corner surface 271 and the second corner surface 2113a are arc surfaces, and the radius of the first corner surface 271 is greater than the radius of the second corner surface 2113a.

[0460] In this embodiment, both the first corner surface 271 and the second corner surface 2113a are arc surfaces. Specifically, the first corner surface 271 is the surface formed at the rounded corner of the outer peripheral surface of the shielding member 27, and similarly, the second corner surface 2113a is the surface formed at the rounded corner of the side surface of the mounting groove 2113. Of course, in other embodiments, the first corner surface 271 can also be the surface formed at the chamfer of the outer peripheral surface of the shielding member 27, and the second corner surface 2113a can also be the surface formed at the chamfer of the side surface of the mounting groove 2113.

[0461] The radius of the first corner surface 271 is greater than the radius of the second corner surface 2113a, that is, the diameter of the rounded corner of the outer peripheral surface of the shield 27 is greater than the diameter of the rounded corner of the side surface of the mounting groove 2113.

[0462] By setting both the first corner surface 271 and the second corner surface 2113a as arc surfaces, and the radius of the first corner surface 271 being greater than the radius of the second corner surface 2113a, a third exhaust gap 281 is formed between the first corner surface 271 and the second corner surface 2113a. The structure is simple and easy to manufacture and process.

[0463] In some embodiments, the first side 272 is welded to the second side 2113b.

[0464] By setting the first side 272 and the second side 2113b to be welded together, the connection between the shield 27 and the groove side of the mounting groove 2113 is improved, thereby enhancing the structural stability of the shield 27 assembled onto the wall 211.

[0465] In some embodiments, see Figure 20 and Figure 21 As shown, the shielding member 27 has a rectangular cross-section in the thickness direction X perpendicular to the wall portion. The outer peripheral surface of the shielding member 27 includes four first side surfaces 272 and four first corner surfaces 271. A third exhaust gap 281 is formed at at least one first corner surface 271.

[0466] Among them, at least one of the first corner surfaces 271 is formed with a third exhaust gap 281. That is, among the four first corner surfaces 271 of the shielding member 27, the third exhaust gap 281 can be formed at the location of only one first corner surface 271, or the third exhaust gap 281 can be formed at the locations of two, three or four first corner surfaces 271.

[0467] It should be noted that in other embodiments, the cross-section of the shielding member 27 in the thickness direction X perpendicular to the wall portion can also be triangular, pentagonal, hexagonal, or trapezoidal, etc.

[0468] By setting the shielding member 27 as a rectangular plate structure, the four sides of the shielding member 27 form four first side surfaces 272, and four first corner surfaces 271 are formed at the four right angles of the shielding member 27. The structure is simple and easy to manufacture.

[0469] According to some embodiments of this application, see Figure 22 As shown, the exhaust passage 28 may also include a fourth exhaust gap 282, which is formed between the shield 27 and the bottom surface of the mounting groove 2113. The fourth exhaust gap 282 connects the third exhaust gap 281 and the exhaust port 2313.

[0470] The fourth exhaust gap 282 is formed between the shielding member 27 and the bottom surface of the mounting groove 2113. It can be that the shielding member 27 and the bottom surface of the mounting groove 2113 are arranged at intervals along the thickness direction X of the wall, so that the fourth exhaust gap 282 is formed between the surface of the shielding member 27 facing the bottom surface of the mounting groove 2113 and the bottom surface of the mounting groove 2113. Alternatively, a first groove 2751 can be provided on the surface of the shielding member 27 facing the bottom surface of the mounting groove 2113, so that the fourth exhaust gap 282 is formed between the bottom surface of the first groove 2751 and the bottom surface of the mounting groove 2113.

[0471] It should be noted that in other embodiments, a first groove 2751 can also be provided on the bottom surface of the mounting groove 2113 so that a fourth venting gap 282 is formed between the bottom surface of the first groove 2751 and the surface of the shield 27 facing the bottom surface of the mounting groove 2113.

[0472] The exhaust passage 28 also includes a fourth exhaust gap 282 formed between the shield 27 and the bottom surface of the mounting groove 2113, and the fourth exhaust gap 282 connects the third exhaust gap 281 and the outlet 2313 to alleviate the phenomenon of exhaust obstruction between the outlet 2313 and the third exhaust gap 281 caused by the shield 27 abutting against the bottom surface of the mounting groove 2113, thereby improving the smoothness of gas discharge from the outlet 2313 of the one-way valve 23 to the third exhaust gap 281.

[0473] In some embodiments, refer to Figure 5 and Figure 22 Please refer to further details. Figure 25 , Figure 25 This is a bottom view of the shielding member 27 of the battery cell 20 provided in some embodiments of this application. Along the thickness direction X of the wall, the shielding member 27 has a third surface 275 facing the one-way valve 23. The third surface 275 overlaps the bottom surface of the mounting groove 2113. The third surface 275 is provided with a first groove 2751. A fourth exhaust gap 282 is formed between the bottom surface of the first groove 2751 and the bottom surface of the mounting groove 2113.

[0474] The third surface 275 overlaps the bottom surface of the mounting groove 2113, that is, part of the third surface 275 abuts against the bottom surface of the mounting groove 2113. In other words, along the thickness direction X of the wall, the shielding member 27 abuts against the bottom surface of the mounting groove 2113.

[0475] A fourth exhaust gap 282 is formed between the bottom surface of the first groove 2751 and the bottom surface of the mounting groove 2113. That is, the bottom surface of the first groove 2751, the side surface of the first groove 2751, and the bottom surface of the mounting groove 2113 jointly define the fourth exhaust gap 282.

[0476] By attaching the third surface 275 of the shield 27 to the bottom surface of the mounting groove 2113, the shield 27 abuts against the bottom surface of the mounting groove 2113, thereby improving the structural stability and reliability of the shield 27 installed in the mounting groove 2113. In addition, by providing a first groove 2751 on the third surface 275, a fourth exhaust gap 282 is formed between the bottom surface of the first groove 2751 and the bottom surface of the mounting groove 2113. This allows the gas discharged from the outlet 2313 of the one-way valve 23 to enter the third exhaust gap 281 through the first groove 2751 and then be discharged outside the outer casing 21. Thus, while ensuring that the shield 27 abuts against the bottom surface of the mounting groove 2113, the third exhaust gap 281 and the outlet 2313 can be connected through the first groove 2751.

[0477] In some embodiments, see Figure 20 , Figure 21 and Figure 25 As shown, a plurality of third exhaust gaps 281 are formed between the shield 27 and the side of the mounting groove 2113. The plurality of third exhaust gaps 281 are arranged at intervals along the circumference of the shield 27. A plurality of first grooves 2751 are provided on the third surface 275. Each third exhaust gap 281 is connected to a first groove 2751.

[0478] In the embodiment where the third exhaust gap 281 is formed between the first corner surface 271 and the second corner surface 2113a, see [reference needed]. Figure 25 As shown, the first groove 2751 extends radially along the shield 27 and penetrates the first corner surface 271, so that the fourth exhaust gap 282 formed between the bottom surface of the first groove 2751 and the bottom surface of the mounting groove 2113 can communicate with the third exhaust gap 281 formed between the first corner surface 271 and the second corner surface 2113a.

[0479] For example, the shield 27 has four first corner surfaces 271, and a third exhaust gap 281 is formed at each first corner surface 271. Correspondingly, four first grooves 2751 are provided on the third surface 275 of the shield 27, and each first groove 2751 penetrates a first corner surface 271.

[0480] By forming a plurality of third exhaust gaps 281 between the shield 27 and the side of the mounting groove 2113, and each third exhaust gap 281 communicating with a first groove 2751, it is beneficial to further improve exhaust efficiency.

[0481] According to some embodiments of this application, see Figure 5 and Figure 25As shown, the third surface 275 may also be provided with a second groove 2752, and a plurality of first grooves 2751 are provided around the second groove 2752 and are all connected to the second groove 2752. The second groove 2752 is connected to the air outlet 2313.

[0482] For example, four first grooves 2751 are provided on the third surface 275 of the shield 27. The four first grooves 2751 are arranged at intervals along the circumference of the second groove 2752. The first grooves 2751 extend radially along the shield 27 and penetrate the groove side of the second groove 2752.

[0483] By providing a second groove 2752 on the third surface 275 of the shield 27 facing the one-way valve 23, the second groove 2752 is connected to the outlet 2313 of the one-way valve 23, and multiple first grooves 2751 are arranged around the second groove 2752 and are all connected to the second groove 2752, so that the gas discharged from the outlet 2313 of the one-way valve 23 can enter the second groove 2752 and then pass through the multiple first grooves 2751 and then through the corresponding third exhaust gaps 281 to be discharged to the outside of the housing 21. This is beneficial to improve exhaust efficiency and can alleviate the phenomenon of gas accumulation between the shield 27 and the one-way valve 23.

[0484] In some embodiments, see Figure 5 As shown, along the thickness direction X of the wall, the air outlet 2313 is located at the end of the one-way valve 23 away from the electrode assembly 22. The air outlet 2313 faces the second groove 2752, and the projection of the air outlet 2313 is located in the second groove 2752.

[0485] For example, the projection of the one-way valve 23 in the thickness direction X of the wall is entirely located within the second groove 2752.

[0486] By setting the outlet 2313 of the one-way valve 23 and the second groove 2752 to face each other, and the projection of the outlet 2313 in the thickness direction X of the wall is located in the second groove 2752, the second groove 2752 is a structure that covers the outlet 2313 in the thickness direction X of the wall, so that the gas discharged from the outlet 2313 of the one-way valve 23 can directly enter the second groove 2752, which is beneficial to improving the exhaust smoothness and exhaust efficiency.

[0487] According to some embodiments of this application, see Figure 5 As shown, along the thickness direction X of the wall, the shielding member 27 does not extend beyond the first surface 2112.

[0488] The shielding member 27 does not extend beyond the first surface 2112, that is, the shielding member 27 does not extend into the mounting groove 2113 in the thickness direction X of the wall, so that the entire shielding member 27 is located within the mounting groove 2113.

[0489] By setting the shield 27 to not extend beyond the first surface 2112 of the wall portion 211 away from the electrode assembly 22 in the thickness direction X of the wall portion, the mounting groove 2113 can provide a certain degree of protection for the shield 27, thereby further reducing the wear of the shield 27.

[0490] In some embodiments, please continue to see Figure 5 As shown, the shield 27 has a fourth surface 276 that is opposite to the one-way valve 23, and the fourth surface 276 is flush with the first surface 2112.

[0491] By setting the fourth surface 276 of the shielding member 27 away from the one-way valve 23 and the first surface 2112 of the wall portion 211 away from the electrode assembly 22 to be flush with each other, it is beneficial to further improve the aesthetics of the outer surface of the battery cell 20, and it is also convenient to set information codes or connect detection elements and other components on the fourth surface 276 of the shielding member 27.

[0492] 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.

[0493] In some embodiments, the shielding member 27 is fixedly connected to the wall portion 211.

[0494] Alternatively, the structure for fixing the shielding member 27 to the wall portion 211 can be varied. For example, the shielding member 27 can be connected to the wall portion 211 by welding, bonding, or interference fit.

[0495] By setting the shield 27 to be fixedly connected to the wall 211, it is beneficial to reduce the risk of the shield 27 detaching from the wall 211 during use, and to improve the connection between the shield 27 and the wall 211, so as to set information codes or connect detection elements and other components on the shield 27.

[0496] According to some embodiments of this application, see Figure 3 and Figure 4 As shown, the battery cell 20 may also include a protective patch 29. The protective patch 29 is disposed on the side of the wall portion 211 away from the electrode assembly 22. The protective patch 29 is provided with an information acquisition hole 291 that penetrates the protective patch 29. The projection of the information acquisition hole 291 in the thickness direction X of the wall portion is located inside the shielding member 27.

[0497] The protective patch 29 is disposed on the side of the wall portion 211 opposite to the electrode assembly 22, that is, the protective patch 29 is disposed on the outer surface of the wall portion 211 to provide a certain degree of protection for the wall portion 211. The protective patch 29 can be made of various materials, such as rubber, silicone, or plastic.

[0498] The protective patch 29 is provided with an information acquisition hole 291 that penetrates the protective patch 29. The information acquisition hole 291 serves to expose part of the outer shell 21 of the bare battery cell 20, so as to set information codes or connect detection elements for sampling on the outer shell 21.

[0499] The projection of the information acquisition hole 291 in the thickness direction X of the wall is located inside the shielding member 27. That is, the information acquisition hole 291 is set corresponding to the shielding member 27, and the shielding member 27 covers the information acquisition hole 291, so that the exposed area of ​​the information acquisition hole 291 is the surface of the shielding member 27, thereby enabling the setting of information codes or connection of detection elements for sampling on the shielding member 27.

[0500] For example, the exposed surface of the shielding member 27 corresponding to the information collection hole 291 is a plane.

[0501] Optionally, the protective patch 29 can be disposed on the wall portion 211 in various ways, and the protective patch 29 can be disposed on the wall portion 211 by means of adhesion, adsorption, etc.

[0502] It should be noted that in embodiments where electrode terminals 24 are provided on the wall portion 211, see [reference needed]. Figure 3 and Figure 4 As shown, along the thickness direction X of the wall portion, the protective patch 29 has a second clearance hole 292 at the position corresponding to the electrode terminal 24. The second clearance hole 292 extends through both sides of the protective patch 29 and is used for the power supply terminal 24 to pass through, thus avoiding the electrode terminal 24. For example, the wall portion 211 has two electrode terminals 24, and correspondingly, the protective patch 29 has two second clearance holes 292, each second clearance hole 292 for one electrode terminal 24 to pass through.

[0503] In an embodiment where a pressure relief mechanism 25 is provided on the wall portion 211, see [reference needed]. Figure 3 and Figure 4 As shown, along the thickness direction X of the wall, the protective patch 29 is provided with a third clearance hole 293 at the position corresponding to the pressure relief mechanism 25. The third clearance hole 293 penetrates both sides of the protective patch 29. Along the thickness direction X of the wall, the projection of the pressure relief mechanism 25 is located in the third clearance hole 293, so that the third clearance hole 293 can avoid the pressure relief mechanism 25.

[0504] The battery cell 20 is also provided with a protective patch 29. By placing the protective patch 29 on the side of the wall 211 away from the electrode assembly 22, the wall 211 can be protected. In addition, by providing an information acquisition hole 291 on the protective patch 29, and the projection of the information acquisition hole 291 in the thickness direction X of the wall is located within the shielding member 27, the information acquisition hole 291 is structured to correspond to the shielding member 27. This facilitates the setting of information codes or connection of detection elements for sampling on the shielding member 27, thereby reducing the sampling burden. The detection elements and other components can prevent damage and pulling on the one-way valve 23. On the other hand, it can improve the aesthetics of the outer surface of the battery cell 20. Furthermore, by setting the shield 27 and the information acquisition hole 291 of the protective patch 29 to correspond, the area where the battery cell 20 exhausts gas through the one-way valve 23 can be set to correspond with the area where the information acquisition hole 291 is set on the protective patch 29. This can save the space occupied by the information acquisition hole 291 and the shield 27 on the outer surface of the housing 21, which is beneficial to improving the integration of the battery cell 20.

[0505] According to some embodiments of this application, refer to Figure 3 Please refer to further details. Figure 26 , Figure 26 This is a schematic diagram showing the connection between the protective patch 29 and the wall portion 211 provided in some embodiments of this application. One end of the exhaust channel 28 is formed with an exhaust port 283 that communicates with the outside of the outer casing 21, and the protective patch 29 covers the exhaust port 283 along the thickness direction X of the wall portion.

[0506] In this embodiment, one end of the exhaust channel 28 forms an exhaust port 283 that communicates with the outside of the outer casing 21. Specifically, the exhaust port 283 is formed at the end of the exhaust channel 28 formed between the shield 27 and the wall portion 211 that communicates with the outside of the outer casing 21. In an embodiment where the exhaust channel 28 includes a third exhaust gap 281 and a fourth exhaust gap 282, the exhaust port 283 is formed at the end of the third exhaust gap 281 that communicates with the outside of the outer casing 21.

[0507] Along the thickness direction X of the wall, the protective patch 29 covers the exhaust port 283, that is, the projection of the exhaust port 283 of the exhaust channel 28 in the thickness direction X of the wall is located within the protective patch 29.

[0508] It should be noted that in some embodiments, the protective patch 29 may cover the entire one-way valve 23 to protect it, in which case the shielding member 27 may not be provided. When the protective patch 29 covers the entire one-way valve 23, a gas passage is formed between the protective patch 29 and the wall portion 211 to allow the gas discharged from the outlet 2313 of the one-way valve 23 to be released to the outside of the battery cell 20.

[0509] By setting the protective patch 29 to cover the exhaust port 283 at one end of the exhaust channel 28 formed between the shield 27 and the wall 211, the exhaust channel 28 can be shielded to improve the aesthetics of the outer surface of the battery cell 20. On the other hand, it can reduce the risk of impurities or particles in the external environment entering the exhaust channel 28 through the exhaust port 283 and blocking the exhaust channel 28, which is beneficial to improving the reliability of the battery cell 20.

[0510] In some embodiments, refer to Figure 26 Please refer to further details. Figure 27 , Figure 27 This is a schematic diagram illustrating the connection between the protective patch 29 and the adhesive layer 30 provided in some embodiments of this application. Along the thickness direction X of the wall portion, the adhesive layer 30 is provided on the side of the protective patch 29 facing the wall portion 211, and the adhesive layer 30 adheres to the protective patch 29 and the wall portion 211. The adhesive layer 30 has a first clearance hole 301 at the position corresponding to the information acquisition hole 291. Along the thickness direction X of the wall portion, the projections of both the information acquisition hole 291 and the exhaust port 283 are located within the first clearance hole 301.

[0511] The adhesive layer 30 serves to bond the protective patch 29 and the wall portion 211. For example, the adhesive layer 30 can be glue or double-sided tape disposed between the protective patch 29 and the wall portion 211.

[0512] Along the thickness direction X of the wall, the projections of the information acquisition hole 291 and the exhaust port 283 are both located within the first clearance hole 301. That is, the area defined by the projection of the first clearance hole 301 onto a plane perpendicular to the thickness direction X of the wall covers the information acquisition hole 291 and the exhaust port 283. In other words, the first clearance hole 301 can avoid the information acquisition hole 291 and the exhaust port 283 in the thickness direction X of the wall.

[0513] For example, in Figure 26 In the middle, the exhaust channel 28 includes a third exhaust gap 281, and the third exhaust gap 281 is formed between the shield 27 and the side of the mounting groove 2113. The exhaust port 283 is formed at one end of the third exhaust gap 281 that connects to the outside of the outer shell 21. Correspondingly, the projection of the mounting groove 2113 and the shield 27 in the thickness direction X of the wall is located in the first clearance hole 301, so that the first clearance hole 301 can avoid the mounting groove 2113 and the shield 27, thereby avoiding the information acquisition hole 291 and the exhaust port 283.

[0514] The area defined by the projection of the first clearance hole 301 in the thickness direction X of the wall covers the information acquisition hole 291 and the mounting groove 2113. Since the projection of the information acquisition hole 291 in the thickness direction X of the wall is located within the shielding member 27, the area of ​​the first clearance hole 301 is larger than the area of ​​the mounting groove 2113, and the area of ​​the mounting groove 2113 is larger than the area of ​​the information acquisition hole 291.

[0515] By providing an adhesive layer 30 on the side of the protective patch 29 facing the wall portion 211, the protective patch 29 can be adhered to the wall portion 211 through the adhesive layer 30. This reduces the assembly difficulty of the protective patch 29 and improves the connection stability of the protective patch 29 on the wall portion 211. Furthermore, by providing a first clearance hole 301 at the position of the adhesive layer 30 corresponding to the information acquisition hole 291, and ensuring that the projections of the information acquisition hole 291 of the protective patch 29 and the exhaust port 283 formed at one end of the exhaust channel 28 in the thickness direction X of the wall portion are both located within the first clearance hole 301, the obstruction of the adhesive layer 30 to the exhaust port 283 of the exhaust channel 28 is reduced. This allows the gas discharged through the exhaust channel 28 to pass through the gap between the protective patch 29 and the wall portion 211, enter the information acquisition hole 291, and then be discharged. This achieves adhesion of the protective patch 29 to the wall portion 211 while minimizing the impact on the exhaust of the one-way valve 23.

[0516] According to some embodiments of this application, see Figure 3 , Figure 4 and Figure 26 As shown, one end of the exhaust channel 28 is formed with an exhaust port 283 that communicates with the outside of the outer casing 21. The battery cell 20 also includes a protective patch 29, which is disposed on the side of the wall portion 211 away from the electrode assembly 22 and covers the exhaust port 283.

[0517] Among them, the protective patch 29 covers the exhaust port 283, that is, the projection of the exhaust port 283 of the exhaust channel 28 in the thickness direction X of the wall is located within the protective patch 29.

[0518] It should be noted that in the embodiment where the adhesive layer 30 is provided on the side of the protective patch 29 facing the wall portion 211, and in the embodiment where the information acquisition hole 291 is not provided with a corresponding shield 27, the adhesive layer 30 forms a channel for connecting the exhaust port 283 and the outside of the housing 21, so that the gas inside the housing 21 can be discharged.

[0519] By providing a protective patch 29 on the side of the wall portion 211 away from the electrode assembly 22, and covering the exhaust port 283 at one end of the exhaust channel 28 formed between the shielding member 27 and the wall portion 211, the exhaust channel 28 can be shielded to improve the aesthetics of the outer surface of the battery cell 20. On the other hand, it can reduce the risk of impurities or particulate matter in the external environment entering the exhaust channel 28 through the exhaust port 283 and clogging the exhaust channel 28, which is beneficial to improving the reliability of the battery cell 20.

[0520] According to some embodiments of this application, see Figure 5 As shown, the wall portion 211 is provided with a mounting hole 2111, and at least a portion of the one-way valve 23 is installed in the mounting hole 2111. The mounting hole 2111 is the liquid injection hole of the battery cell 20.

[0521] In the embodiment where the mounting hole 2111 is the liquid injection hole of the battery cell 20, before assembling the one-way valve 23, liquid needs to be injected into the inside of the outer casing 21 through the liquid injection hole, and then the one-way valve 23 is assembled into the mounting hole 2111.

[0522] By setting the mounting hole 2111 of the one-way valve 23 as a liquid injection hole, liquid can be injected into the housing 21 through the mounting hole 2111 before assembling the one-way valve 23 into the mounting hole 2111. This eliminates the need to open a separate liquid injection hole on the housing 21, which is beneficial to improving the production efficiency of the battery cell 20 and reducing the manufacturing cost of the battery cell 20.

[0523] According to some embodiments of this application, see Figure 3 and Figure 4 As shown, the housing 21 may include a housing 212 and an end cap 213. The interior of the housing 212 forms a receiving cavity with an opening 2121 for receiving the electrode assembly 22. The end cap 213 closes the opening 2121 and is a wall portion 211.

[0524] The end cap 213 is the wall portion 211, meaning that the one-way valve 23 is located on the end cap 213.

[0525] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, the housing 212 includes a wall portion 211. That is, the one-way valve 23 is installed on one wall of the housing 212. The one-way valve 23 can be installed on the bottom wall of the housing 212 opposite to the end cap 213, or it can be installed on the side wall of the housing 212 and the end cap 213 that are adjacent to each other and connected to each other.

[0526] By designating the wall portion 211 of the outer casing 21 as an end cap 213 for closing the opening 2121 of the housing 212, the battery cell 20 with this structure facilitates the installation of the one-way valve 23 on the end cap 213, reducing the assembly difficulty of the battery cell 20 and improving its production efficiency. Similarly, by designing the wall portion 211 of the outer casing 21 as a wall of the housing 212, the battery cell 20 with this structure reduces the stress generated when the end cap 213 is connected to the housing 212, thus mitigating the risk of damage to the one-way valve 23 and improving the stability and service life of the battery cell 20.

[0527] 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 25, which is disposed in the housing 21. The pressure relief mechanism 25 is configured to be actuated and release the internal pressure of the battery cell 20 in the event of thermal runaway. The actuation pressure of the pressure relief mechanism 25 is greater than the opening pressure of the one-way valve 23.

[0528] The pressure relief mechanism 25 is disposed on the outer casing 21, and can be disposed on the end cap 213 or on the housing 212. For example, in Figure 4 In the middle, the pressure relief mechanism 25 is installed on the end cover 213.

[0529] The pressure relief mechanism 25 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 25 can be actuated and opened to release gases and other gases generated inside the battery cell 20 due to thermal runaway.

[0530] The actuation pressure of the pressure relief mechanism 25 is greater than the opening pressure of the one-way valve 23. In other words, the pressure at which the gas inside the casing 21 opens the pressure relief mechanism 25 is greater than the pressure at which the gas inside the casing 21 opens the one-way valve 23. It should be noted that when the battery cell 20 experiences thermal runaway, the gas inside the casing 21 of the battery cell 20 will rapidly increase to open the pressure relief mechanism 25 for pressure relief. However, during normal use, when the gas generated inside the casing 21 of the battery cell 20 reaches a threshold, it can open the one-way valve 23, but it cannot open the pressure relief mechanism 25.

[0531] Optionally, the pressure relief mechanism 25 can be integrally formed with the housing 21 or it can be a separate structure. If the pressure relief mechanism 25 is integrally formed with the housing 21, then the pressure relief mechanism 25 is located in an area of ​​the housing 21 with a weak structure, such as an area with a groove. If the pressure relief mechanism 25 is a separate structure from the housing 21, then the pressure relief mechanism 25 can be connected to the housing 21 by welding, hot melting, injection molding, or bonding. For example, in... Figure 4 In this structure, the pressure relief mechanism 25 and the outer shell 21 are separate components, and the pressure relief mechanism 25 is located on the end cap 213 of the outer shell 21. The pressure relief mechanism 25 can be a pressure relief component such as an explosion-proof valve, an explosion-proof disc, a pressure relief valve, or a safety valve.

[0532] For example, in Figure 4 In this embodiment, both the electrode terminal 24 and the pressure relief mechanism 25 are disposed on the end cover 213. The battery cell 20 with this structure can save space occupied by the battery cell 20. Of course, in other embodiments, the electrode terminal 24 and the pressure relief mechanism 25 can also be disposed on different walls of the housing 21. The battery cell 20 with this structure can keep the electrode terminal 24 used for outputting or inputting electrical energy and the pressure relief mechanism 25 used for releasing internal pressure far apart from each other, so as to reduce the risk of using the battery cell 20. For example, the pressure relief mechanism 25 is disposed on the housing 212 and the electrode terminal 24 is disposed on the end cover 213.

[0533] By setting the opening pressure of the one-way valve 23 to release gas to be less than the actuation pressure of the pressure relief mechanism 25, gas generated inside the casing 21 during normal use of the battery cell 20 can be discharged to the outside of the casing 21 through the one-way valve 23. This alleviates the phenomenon that the pressure relief mechanism 25 may prematurely actuate and release pressure before the battery cell 20 thermally runs away due to the rise in internal gas pressure. This effectively improves the stability of the battery cell 20 and enhances its service life and reliability.

[0534] In some embodiments, the one-way valve 23 and the pressure relief mechanism 25 may be disposed on the same wall of the housing 21. For example, both the one-way valve 23 and the pressure relief mechanism 25 may be disposed on the end cap 213. This structure of the battery cell 20 helps to save space occupied by the battery cell 20, thereby increasing the energy density of the battery cell 20.

[0535] In some embodiments, the one-way valve 23 and the pressure relief mechanism 25 may be disposed on different walls of the housing 21. For example, the one-way valve 23 may be disposed on the end cap 213, and the pressure relief mechanism 25 may be disposed on the housing 212. This structure of the battery cell 20 reduces the interaction between the one-way valve 23 and the pressure relief mechanism 25 and makes it suitable for different operating environments.

[0536] In some embodiments, the exhaust rate of the one-way valve 23 is less than the exhaust rate of the pressure relief mechanism 25.

[0537] By setting the exhaust rate of the one-way valve 23 to be less than the exhaust rate of the pressure relief mechanism 25, the phenomenon that the pressure relief mechanism 25 cannot be actuated and opened due to the excessive exhaust rate of the one-way valve 23 when the battery cell 20 experiences thermal runaway can be alleviated. This allows the pressure relief mechanism 25 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.

[0538] According to some embodiments of this application, refer to Figure 4 Please refer to further details. Figure 28 , Figure 28 This is a partial structural schematic diagram of a battery cell provided in some embodiments of this application. Along the thickness direction X of the wall portion, the wall portion 211 has a second surface 2114 facing the electrode assembly 22, and a one-way valve 23 protrudes from the second surface 2114. The battery cell 20 also includes an electrode terminal 24 and a current collector 31. The electrode terminal 24 is mounted on the wall portion 211 and is used to output or input electrical energy into the battery cell 20. The current collector 31 connects the electrode terminal 24 and the electrode assembly 22, and at least a portion of the current collector 31 is disposed between the wall portion 211 and the electrode assembly 22. The current collector 31 is provided with a clearance groove 311, and the one-way valve 23 extends along the thickness direction X of the wall portion into the clearance groove 311.

[0539] The electrode terminal 24 is disposed on the wall portion 211 and is used to electrically connect with the tab 221 of the electrode assembly 22 to realize the input or output of electrical energy of the battery cell 20.

[0540] The current collector 31 is disposed inside the housing 21. The current collector 31 serves as the tab 221 connecting the electrode terminal 24 and the electrode assembly 22 to achieve electrical connection between the electrode terminal 24 and the electrode assembly 22. The current collector 31 can be made of various materials, such as copper, iron, steel or aluminum.

[0541] For example, the battery cell 20 is provided with two electrode terminals 24, and both electrode terminals 24 are mounted on the wall portion 211. The two electrode terminals 24 are respectively used to electrically connect to two tabs 221 with opposite polarities to the electrode assembly 22, so as to realize the output or input of the positive and negative electrodes of the battery cell 20 respectively.

[0542] The flow collector 31 is provided with a relief groove 311. The one-way valve 23 extends into the relief groove 311 along the thickness direction X of the wall. That is, the flow collector 31 is provided with a relief groove 311 at the position of the one-way valve 23 so that the part of the one-way valve 23 that protrudes from the second surface 2114 along the thickness direction X of the wall can be accommodated in the relief groove 311.

[0543] The battery cell 20 is also provided with electrode terminals 24 for inputting or outputting electrical energy. The current collector 31 connects the electrode assembly 22 and the electrode terminals 24, thereby reducing the difficulty of connecting the electrode assembly 22 and the electrode terminals 24. In addition, by providing a clearance groove 311 on the current collector 31, and the one-way valve 23 extending into the clearance groove 311 in the thickness direction X of the wall, the clearance groove 311 allows the current collector 31 to avoid the one-way valve 23, thereby reducing the interference between the current collector 31 and the one-way valve 23. On the other hand, it saves the space occupied by the one-way valve 23 and the current collector 31 inside the housing 21, which is beneficial to improving the energy density of the battery cell 20.

[0544] In some embodiments, the battery cell 20 is an alkali metal battery, such as a sodium metal battery or a lithium metal battery. The alkali metal battery, used in conjunction with the one-way valve 23, can promptly release the gas generated during normal operation, thereby improving the battery's lifespan.

[0545] 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.

[0546] Among them, see Figure 2 As shown, the battery 100 may further include a housing 10, in which the battery cell 20 is housed. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which cover each other and together define an assembly space for accommodating the battery cell 20.

[0547] Optionally, in Figure 2 In this embodiment, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12, so that the first box body 11 and the second box body 12 together define the assembly space. Of course, the structure of the box body 10 is not limited to this. In other embodiments, the first box body 11 and the second box body 12 can also both be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0548] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 2 In the middle, box 10 has a rectangular structure.

[0549] 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.

[0550] 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.

[0551] 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.

[0552] 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.

[0553] The electrical device can be any of the aforementioned devices or systems that utilize battery cells 20.

[0554] According to some embodiments of this application, see Figures 3 to 8 , Figures 16 to 17 , Figures 20 to 22 as well as Figures 25 to 27As shown, this application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, a one-way valve 23, an insulator 26, a shielding member 27, a protective patch 29, and a pressure relief mechanism 25. The housing 21 has a wall portion 211, and includes a shell 212 and an end cap 213. The interior of the shell 212 forms a receiving cavity with an opening 2121, in which the electrode assembly 22 is received. The end cap 213 closes the opening 2121 and is part of the wall portion 211. Along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2112 facing away from the electrode assembly 22 and a second surface 2114 facing the electrode assembly 22. The first surface 2112 is provided with a mounting groove 2113, and the bottom surface of the mounting groove 2113 is provided with a mounting hole 2111. The one-way valve 23 is installed in the mounting hole 2111 and protrudes from the second surface 2114. The one-way valve 23 is used to discharge gas inside the housing 21. The one-way valve 23 includes a valve body 231 and a valve core 232. The valve body 231 includes a valve body 2314 and a valve cover 2315. The valve body 2314 is disposed in the mounting hole 2111 and protrudes from the second surface 2114. The valve body 2314 has an air inlet 2312 at one end near the electrode assembly 22 in the thickness direction X of the wall. Along the thickness direction X of the wall, the valve cover 2315 is connected to the end of the valve body 2314 away from the electrode assembly 22. The valve cover 2315 has an air outlet 2313. The valve cover 2315 and the valve body 2314 together form a mounting cavity 2311. The air inlet 2312 connects the mounting cavity 2311 and the interior of the outer shell 21, and the air outlet 2313 connects the mounting cavity 2311 and the exterior of the outer shell 21. A groove 2314a is provided at one end of the valve body 2314 away from the electrode assembly 22. The valve cover 2315 is accommodated in the groove 2314a and does not extend beyond the end of the valve body 2314 away from the electrode assembly 22. The valve core 232 includes an elastic element 2321 and a sealing element 2322. The elastic element 2321 is a spring. The sealing element 2322 is movably disposed between the valve cover 2315 and the bottom surface of the mounting cavity 2311 along the thickness direction X of the wall. The two ends of the elastic element 2321 in the thickness direction X of the wall abut against the sealing element 2322 and the valve cover 2315 respectively. The sealing element 2322 is used to block the air inlet 2312 under the action of the elastic element 2321 and to open the air inlet 2312 under the action of the gas inside the outer casing 21. The valve cover 2315 has a first guide post 2315b protruding on the side facing the sealing member 2322. A portion of the elastic member 2321 is sleeved on the outside of the first guide post 2315b. The diameter of the first guide post 2315b is D1, and the inner diameter of the elastic member 2321 is D2, satisfying that 0mm < D2 - D1 ≤ 5mm.The sealing component 2322 includes a pressing part 2322a and a sealing part 2322b. Along the thickness direction X of the wall, the two ends of the elastic member 2321 abut against the valve cover 2315 and the pressing part 2322a respectively. The sealing part 2322b is connected to the side of the pressing part 2322a facing away from the valve cover 2315. The sealing part 2322b is used to seal the air inlet 2312. A second guide post 2322c protrudes from the side of the pressing part 2322a facing the valve cover 2315. A portion of the elastic member 2321 is sleeved on the outside of the second guide post 2322c. The diameter of the second guide post 2322c is D3, and the inner diameter of the elastic member 2321 is D2, satisfying that 0mm < D3 - D1 ≤ 5mm. The pressing part 2322a has a first abutting surface 2322f facing the sealing part 2322b, and the sealing part 2322b has a second abutting surface 2322g facing the pressing part 2322a. The first abutting surface 2322f is provided with a snap-fit ​​groove 2322h, and the second abutting surface 2322g is provided with a snap-fit ​​part 2322k. The snap-fit ​​part 2322k engages with the snap-fit ​​groove 2322h. Along the thickness direction X of the wall, the distance between the first guide post 2315b and the second guide post 2322c is L, which satisfies 0mm < L ≤ 2mm. The mounting hole 2111 includes a first hole segment 2111b and a second hole segment 2111c. The first hole segment 2111b and the second hole segment 2111c are arranged along the thickness direction X of the wall, and the first hole segment 2111b is located on the side of the second hole segment 2111c away from the electrode assembly 22. The diameter of the first hole segment 2111b is larger than the diameter of the second hole segment 2111c. The hole wall surface of the first hole segment 2111b is a first connecting surface 2111a. The valve body 231 has a connecting portion 2314c located in the first hole segment 2111b. The outer peripheral surface of the connecting portion 2314c is a second connecting surface 2314b. The first connecting surface 2111a and the second connecting surface 2314b are both arranged around the central axis of the mounting hole 2111. The first connecting surface 2111a and the second connecting surface 2314b are welded together. The first connecting surface 2111a and the second connecting surface 2314b are fitted together, and both the first connecting surface 2111a and the second connecting surface 2314b are set at an acute angle to the central axis of the mounting hole 2111. The insulating member 26 includes a body portion 261 and a receiving portion 262. The body portion 261 is disposed on the side of the wall portion 211 facing the electrode assembly 22, and the receiving portion 262 is connected to the body portion 261. The portion of the one-way valve 23 extending into the housing 21 is received in the receiving portion 262. The receiving portion 262 includes a first wall 2622 and a second wall 2623. The first wall 2622 surrounds the valve body 231. Along the thickness direction X of the wall portion, one end of the first wall 2622 is connected to the body portion 261, and the second wall 2623 is connected to the end of the first wall 2622 away from the body portion 261. A second through hole 2621 is provided on the second wall 2623, and the second through hole 2621 communicates with the interior of the housing 21 of the air inlet 2312.The shielding member 27 is installed in the mounting groove 2113 of the wall portion 211 and abuts against the bottom surface of the groove 2113. Along the thickness direction X of the wall portion, the shielding member 27 is located on the side of the one-way valve 23 away from the electrode assembly 22, and the shielding member 27 covers the one-way valve 23. An exhaust passage 28 is formed between the shielding member 27 and the wall portion 211, and the exhaust passage 28 connects the exhaust port 2313 and the outside of the outer casing 21. The exhaust passage 28 includes a third exhaust gap 281 and a fourth exhaust gap 282. The third exhaust gap 281 is formed between the shielding member 27 and the side surface of the mounting groove 2113. The shielding member 27 and the mounting groove 2113 have rectangular cross-sections in the thickness direction X perpendicular to the wall portion. The outer peripheral surface of the shielding member 27 includes four first corner surfaces 271 and four first side surfaces 272. Each pair of adjacent first side surfaces 272 are connected by a first corner surface 271. The bottom surface of the mounting groove 2113 includes four second corner surfaces 2113a and four second side surfaces 2113b. Each pair of adjacent second side surfaces 2113b are connected by a second corner surface 2113a. Each first side surface 272 abuts against and is welded to its corresponding second side surface 2113b. A third venting gap 281 is formed between each first corner surface 271 and its corresponding second corner surface 2113a. Both the first corner surface 271 and the second corner surface 2113a are arc surfaces, and the radius of the first corner surface 271 is larger than the radius of the second corner surface 2113a. Along the thickness direction X of the wall portion, the shielding member 27 has a third surface 275 facing the one-way valve 23 and a fourth surface 276 facing away from the one-way valve 23. The third surface 275 overlaps the bottom surface of the mounting groove 2113, and the fourth surface 276 is flush with the first surface 2112. The third surface 275 is provided with four first grooves 2751, which extend radially along the shielding member 27 and penetrate a first corner surface 271. A fourth exhaust gap 282 is formed between the bottom surface of the first groove 2751 and the bottom surface of the mounting groove 2113. The third surface 275 is also provided with a second groove 2752, and multiple first grooves 2751 are provided around the second groove 2752 and are all connected to the second groove 2752. The second groove 2752 is connected to the air outlet 2313. Along the thickness direction X of the wall portion, the vent 2313 faces the second groove 2752, and the projection of the vent 2313 is located within the second groove 2752. A protective patch 29 is disposed on the side of the wall portion 211 facing away from the electrode assembly 22. An information acquisition hole 291 penetrating the protective patch 29 is provided on the protective patch 29, and the projection of the information acquisition hole 291 along the thickness direction X of the wall portion is located within the shielding member 27. One end of the exhaust channel 28 forms an exhaust port 283 communicating with the outside of the outer casing 21, and the protective patch 29 covers the exhaust port 283 along the thickness direction X of the wall portion.An adhesive layer 30 is provided on the side of the protective patch 29 facing the wall portion 211. The adhesive layer 30 adheres the protective patch 29 and the wall portion 211. A first clearance hole 301 is provided on the adhesive layer 30 at the position corresponding to the information acquisition hole 291. Along the thickness direction X of the wall portion, the projections of the mounting groove 2113 and the shielding member 27 are both located within the first clearance hole 301. A pressure relief mechanism 25 is provided on the wall portion 211. The pressure relief mechanism 25 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 25 is greater than the opening pressure of the one-way valve 23, and the exhaust rate of the one-way valve 23 is less than the exhaust rate of the pressure relief mechanism 25.

[0555] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0556] 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; as well as A one-way valve is disposed on the wall portion, and the one-way valve is used to discharge gas from inside the housing; The battery cell further includes a shielding member, which is installed on the wall portion. Along the thickness direction of the wall portion, the shielding member is located on the side of the one-way valve away from the electrode assembly. The shielding member covers the one-way valve, which has an outlet for discharging gas from inside the housing. An exhaust channel is formed between the shielding member and the wall portion, or an exhaust channel is provided on the shielding member. The exhaust channel connects the outlet and the outside of the housing.

2. The battery cell according to claim 1, characterized in that, The one-way valve includes: A valve body is disposed on the wall portion, and an installation cavity is formed inside the valve body. An air inlet and an air outlet are provided on the valve body. The air inlet is used to connect the installation cavity and the interior of the outer shell, and the air outlet is used to connect the installation cavity and the exterior of the outer shell. A valve core is disposed within the mounting cavity. The valve core is used to block the air inlet and to open the air inlet under the action of gas inside the housing.

3. The battery cell according to claim 2, characterized in that, The valve body includes: A valve body is disposed on the wall portion, and the valve body is provided with the air inlet. A valve cover is disposed at one end of the valve body away from the electrode assembly along the thickness direction of the wall portion, and the valve cover and the valve body together enclose the mounting cavity.

4. The battery cell according to claim 3, characterized in that, The valve cover is connected to the valve body, and the air outlet is a first through hole provided on the valve cover.

5. The battery cell according to claim 3, characterized in that, The valve cover is connected to the valve body, and the air outlet is the first exhaust gap formed between the valve cover and the valve body.

6. The battery cell according to claim 3, characterized in that, The valve cover is connected to the valve body, and a groove is provided at one end of the valve body away from the electrode assembly. At least a portion of the valve cover is accommodated in the groove.

7. The battery cell according to claim 6, characterized in that, Along the thickness direction of the wall portion, the valve cover does not extend beyond the end of the valve body that is away from the electrode assembly.

8. The battery cell according to claim 7, characterized in that, Along the thickness direction of the wall portion, the wall portion has a first surface that is opposite to the electrode assembly, and the valve body does not extend beyond the first surface.

9. The battery cell according to claim 3, characterized in that, The valve cover is connected to the wall portion, and the air outlet is a second exhaust gap formed between the valve cover and the wall portion.

10. The battery cell according to claim 3, characterized in that, The valve body and the wall are integrally formed.

11. The battery cell according to claim 3, characterized in that, The valve core includes: 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.

12. The battery cell according to claim 11, characterized in that, The elastic element is a spring.

13. The battery cell according to claim 11, characterized in that, The elastic element is made of steel, iron, or aluminum.

14. The battery cell according to claim 11, characterized in that, Along the thickness direction of the wall portion, the valve cover and the sealing member are spaced apart, the two ends of the elastic member abut against the valve cover and the sealing member respectively, and the air inlet is located on the bottom surface of the mounting cavity.

15. The battery cell according to claim 14, characterized in that, The valve cover has a first guide post protruding on the side facing the sealing member, and part of the elastic member is sleeved on the outside of the first guide post.

16. The battery cell according to claim 15, characterized in that, The valve cover is connected to the valve body, and the air outlet is a first through hole provided on the valve cover; Wherein, along the thickness direction of the wall portion, the air outlet penetrates the first guide post; or Along the radial direction of the first guide post, the air outlets are arranged at intervals from the first guide post.

17. The battery cell according to claim 15, characterized in that, The diameter of the first guide post is D1, and the inner diameter of the elastic element is D2, satisfying that 0mm < D2 - D1 ≤ 5mm.

18. The battery cell according to claim 14, characterized in that, The valve cover has a first limiting groove on the side facing the sealing member, and the end of the elastic member away from the sealing member is inserted into the first limiting groove.

19. The battery cell according to claim 14, characterized in that, The end of the elastic element away from the sealing element is fixedly connected to the valve cover.

20. The battery cell according to claim 14, characterized in that, The sealing member has a second guide post protruding on the side facing the valve cover, and part of the elastic member is sleeved on the outside of the second guide post.

21. The battery cell according to claim 20, characterized in that, The diameter of the second guide post is D3, and the inner diameter of the elastic element is D2, satisfying that 0mm < D3 - D1 ≤ 5mm.

22. The battery cell according to claim 14, characterized in that, The sealing member has a second limiting groove on the side facing the valve cover, and the end of the elastic member away from the valve cover is inserted into the second limiting groove.

23. The battery cell according to claim 14, characterized in that, The end of the elastic element away from the valve cover is fixedly connected to the sealing element.

24. The battery cell according to claim 14, characterized in that, The sealing element is spaced apart from the side of the mounting cavity.

25. The battery cell according to claim 14, characterized in that, The outer peripheral surface of the sealing member is provided with a plurality of limiting protrusions, which are arranged at intervals along the circumference of the sealing member, and the limiting protrusions are guided and engaged with the side surface of the mounting cavity.

26. The battery cell according to claim 14, characterized in that, The sealing component includes a pressing part and a sealing part. Along the thickness direction of the wall, the two ends of the elastic element abut against the valve cover and the pressing part, respectively. The sealing part is connected to the side of the pressing part away from the valve cover. The sealing part is used to block the air inlet.

27. The battery cell according to claim 26, characterized in that, The pressing part has a first abutting surface facing the sealing part, and the sealing part has a second abutting surface facing the pressing part. One of the first abutting surface and the second abutting surface is provided with a snap-fit ​​groove, and the other is provided with a snap-fit ​​part, which engages with the snap-fit ​​groove.

28. The battery cell according to claim 26, characterized in that, The sealing part is bonded to the pressing part.

29. The battery cell according to claim 26, characterized in that, The sealing material includes EPDM, fluororubber, or Teflon.

30. The battery cell according to claim 14, characterized in that, Along the thickness direction of the wall portion, the size of the gap between the valve cover and the sealing member is L, which satisfies 0mm < L ≤ 2mm.

31. The battery cell according to claim 3, characterized in that, The valve body is welded to the wall.

32. The battery cell according to claim 31, characterized in that, The wall portion is provided with a mounting hole, at least a portion of the valve body is accommodated in the mounting hole, the wall surface of the mounting hole includes a first connecting surface, the valve body includes a second connecting surface, the first connecting surface and the second connecting surface are both arranged around the central axis of the mounting hole, and the first connecting surface and the second connecting surface are welded together.

33. The battery cell according to claim 32, characterized in that, The first connecting surface and the second connecting surface fit together, and both the first connecting surface and the second connecting surface are set at an acute angle to the central axis of the mounting hole.

34. The battery cell according to claim 33, characterized in that, The mounting hole includes a first hole segment and a second hole segment, the first hole segment and the second hole segment are arranged along the thickness direction of the wall portion, and the first hole segment is located on the side of the second hole segment away from the electrode assembly, and the diameter of the first hole segment is larger than the diameter of the second hole segment. Wherein, the wall surface of the first hole segment is the first connecting surface, the valve body has a connecting part located within the first hole segment, and the outer peripheral surface of the connecting part is the second connecting surface.

35. The battery cell according to claim 32, characterized in that, Along the thickness direction of the wall portion, the end face of the valve body opposite to the electrode assembly is connected to the second connecting surface, and a first stress relief groove is provided on the end face of the valve body opposite to the electrode assembly.

36. The battery cell according to claim 35, characterized in that, The first stress relief groove is arranged around the central axis of the mounting hole.

37. The battery cell according to claim 1, characterized in that, The battery cell also includes: An insulating element is disposed on the side of the wall portion facing the electrode assembly; Wherein, along the thickness direction of the wall portion, the wall portion has a second surface facing the electrode assembly, the one-way valve protrudes from the second surface, the insulating member includes a body portion and a receiving portion, the body portion is disposed on the side of the wall portion facing the electrode assembly, the receiving portion is connected to the body portion, and the portion of the one-way valve extending into the interior of the housing is received within the receiving portion.

38. The battery cell according to claim 37, characterized in that, The one-way valve includes a valve body, which protrudes from the second surface along the thickness direction of the wall, and the portion of the valve body protruding from the second surface is provided with an air inlet, which is configured to allow gas inside the housing to be discharged. The receiving part is provided with a second through hole, which is connected to the air inlet.

39. The battery cell according to claim 38, characterized in that, Along the thickness direction of the wall portion, the air inlet is located at the end of the valve body facing the electrode assembly; The receiving portion includes a first wall and a second wall. The first wall surrounds the valve body. Along the thickness direction of the wall portion, one end of the first wall is connected to the main body portion, and the second wall is connected to the end of the first wall away from the main body portion. The second through hole is disposed in the first wall and / or the second wall.

40. The battery cell according to claim 39, characterized in that, The receiving part is integrally formed with the main body.

41. The battery cell according to claim 39, characterized in that, The receiving part is separately disposed from the main body.

42. The battery cell according to claim 41, characterized in that, The receiving portion further includes: A flange is connected to the end of the first wall away from the second wall. At least a portion of the flange is stacked with the body portion, and the flange abuts against the side of the body portion facing the wall portion.

43. The battery cell according to claim 42, characterized in that, Along the thickness direction of the wall portion, the surface of the main body portion facing the wall portion is provided with a receiving groove, and the flange portion is received in the receiving groove.

44. The battery cell according to claim 43, characterized in that, Along the thickness direction of the wall portion, the surface of the flange portion facing the wall portion is flush with the surface of the body portion facing the wall portion.

45. The battery cell according to any one of claims 1-44, 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.

46. ​​The battery cell according to claim 45, characterized in that, The exhaust channel includes a third exhaust gap, which is formed between the shield and the side of the mounting groove. The third exhaust gap is used to connect the air outlet and the outside of the housing.

47. The battery cell according to claim 46, characterized in that, The outer peripheral surface of the shielding member includes a first corner surface and at least two first side surfaces, wherein the first corner surface connects two adjacent first side surfaces; The mounting groove has a second corner surface and at least two second side surfaces. The second corner surface connects two adjacent second side surfaces, and each second side surface is connected to a first side surface. The third exhaust gap is formed between the second corner surface and the first corner surface.

48. The battery cell according to claim 47, characterized in that, Both the first corner surface and the second corner surface are arc surfaces, and the radius of the first corner surface is greater than the radius of the second corner surface.

49. The battery cell according to claim 47, characterized in that, The first side is welded to the second side.

50. The battery cell according to claim 47, characterized in that, The shielding member has a rectangular cross-section in the direction perpendicular to the thickness of the wall, and the outer peripheral surface of the shielding member includes four first side surfaces and four first corner surfaces, with the third exhaust gap formed at at least one first corner surface.

51. The battery cell according to claim 46, characterized in that, The exhaust channel also includes a fourth exhaust gap, which is formed between the shield and the bottom surface of the mounting groove, and the fourth exhaust gap connects the third exhaust gap and the air outlet.

52. The battery cell according to claim 51, characterized in that, Along the thickness direction of the wall portion, the shielding member has a third surface facing the one-way valve, the third surface overlapping the bottom surface of the mounting groove, the third surface being provided with a first groove, and the fourth exhaust gap being formed between the bottom surface of the first groove and the bottom surface of the mounting groove.

53. The battery cell according to claim 52, characterized in that, A plurality of third exhaust gaps are formed between the shielding member and the side of the mounting groove. The plurality of third exhaust gaps are arranged at intervals along the circumference of the shielding member. A plurality of first grooves are provided on the third surface, and each third exhaust gap communicates with a first groove.

54. The battery cell according to claim 53, characterized in that, The third surface is also provided with a second groove, and a plurality of first grooves are provided around the second groove and are all connected to the second groove. The second groove is connected to the air outlet.

55. The battery cell according to claim 54, characterized in that, Along the thickness direction of the wall portion, the air outlet is located at the end of the one-way valve away from the electrode assembly, the air outlet faces the second groove, and the projection of the air outlet is located within the second groove.

56. The battery cell according to claim 45, characterized in that, Along the thickness direction of the wall portion, the shielding member does not extend beyond the first surface.

57. The battery cell according to claim 56, characterized in that, The shielding member has a fourth surface that is opposite to the one-way valve, and the fourth surface is flush with the first surface.

58. The battery cell according to any one of claims 1-44, characterized in that, The shielding component is fixedly connected to the wall portion.

59. The battery cell according to any one of claims 1-44, characterized in that, The battery cell also includes: A protective patch is disposed on the side of the wall portion away from the electrode assembly. The protective patch has an information acquisition hole that penetrates the protective patch. The projection of the information acquisition hole in the thickness direction of the wall portion is located within the shielding member.

60. The battery cell according to claim 59, characterized in that, One end of the exhaust channel has an exhaust port that connects to the outside of the housing, and the protective patch covers the exhaust port.

61. The battery cell according to claim 60, 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 acquisition hole. Along the thickness direction of the wall, the projections of the information acquisition hole and the exhaust port are both located within the first clearance hole.

62. The battery cell according to any one of claims 1-44, characterized in that, One end of the exhaust channel is formed with an exhaust port that connects to the outside of the outer casing; The battery cell also includes a protective patch disposed on the side of the wall facing away from the electrode assembly, and the protective patch covers the vent.

63. The battery cell according to any one of claims 1-44, characterized in that, The wall portion is provided with a mounting hole, and at least a portion of the one-way valve is installed in the mounting hole, which is the liquid injection hole of the battery cell.

64. The battery cell according to any one of claims 1-44, 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.

65. The battery cell according to any one of claims 1-44, characterized in that, The battery cell also includes: A pressure relief mechanism is disposed in the housing, and the pressure relief mechanism is configured to be actuated and release the internal pressure of the battery cell in the event of thermal runaway of the battery cell, wherein the actuation pressure of the pressure relief mechanism is greater than the opening pressure of the one-way valve.

66. The battery cell according to claim 65, characterized in that, The exhaust rate of the one-way valve is less than the exhaust rate of the pressure relief mechanism.

67. The battery cell according to any one of claims 1-44, characterized in that, Along the thickness direction of the wall portion, the wall portion has a second surface facing the electrode assembly, and the one-way valve protrudes from the second surface; The battery cell further includes electrode terminals and current collectors. The electrode terminals are mounted on the wall and are used to output or input electrical energy into the battery cell. The current collectors connect the electrode terminals and the electrode assembly, and at least a portion of the current collectors is disposed between the wall and the electrode assembly. The flow collecting component is provided with a clearance groove, and the one-way valve extends into the clearance groove along the thickness direction of the wall.

68. A battery, characterized in that, Includes the battery cell as described in any one of claims 1-67.

69. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-67, the battery cell being used to provide electrical energy.

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