Battery monomer, battery and electric device

Abstract

The invention 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 is provided with a wall part, the electrode assembly is accommodated in the shell, and the one-way valve is arranged on the wall part and used for discharging gas in the shell. The one-way valve is arranged on the wall part of the shell, so that the one-way valve can be opened unidirectionally, and gas in the shell can be discharged out of the shell, so that the gas generated in the shell can be discharged out of the shell through the one-way valve in the normal use process of the single battery; the phenomenon that the internal pressure of the battery monomer reaches a threshold value in advance due to the rise of the internal air pressure of the battery monomer is relieved, so that the use stability of the battery monomer can be effectively improved, the service life of the battery monomer is prolonged, and the use reliability of the battery monomer is improved.

Description

Technical Field

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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also growing. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of reliability and service life.

[0003] In battery technology, in order to ensure the safety of battery cells, a pressure relief mechanism for releasing the internal pressure of the battery cells is generally provided on the outer shell of the battery cells, so that when the internal pressure or temperature of the battery cells reaches a threshold value, the pressure relief mechanism can be activated and release the internal pressure of the battery cells. However, the pressure relief mechanism of the existing battery cells may be activated and release the pressure in advance during use, resulting in poor stability in the use of the battery cells, which is not conducive to improving the service life and reliability of the battery cells. Summary of the invention

[0004] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively improve the service life and reliability of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, comprising a shell, an electrode assembly and a one-way valve; the shell has a wall portion; the electrode assembly is accommodated in the shell; the one-way valve is arranged on the wall portion, and the one-way valve is used to discharge the gas inside the shell.

[0006] In the above technical solution, a one-way valve is arranged on the wall of the outer shell so that the one-way valve can be opened in one direction and discharge the gas inside the outer shell to the outside of the outer shell. Therefore, when gas is generated inside the outer shell during normal use of the battery cell, it can be discharged to the outside of the outer shell through the one-way valve to alleviate the phenomenon that the internal pressure of the battery cell reaches the threshold value prematurely due to the increase in the internal air pressure of the battery cell, thereby effectively improving the use stability of the battery cell, thereby improving the service life and reliability of the battery cell.

[0007] In some embodiments, the one-way valve includes a valve body and a valve core; the valve body is arranged on the wall portion, an installation cavity is formed inside the valve body, and an air inlet and an air outlet are arranged on the valve body, the air inlet is used to connect the installation cavity with the interior of the outer shell, and the air outlet is used to connect the installation cavity with the outside of the outer shell; the valve core is arranged in the installation cavity, the valve core is used to block the air inlet, and is used to open the air inlet under the action of the gas inside the outer shell.

[0008] In the above technical solution, the one-way valve is provided with a valve body and a valve core. The valve body is arranged on the wall portion, and the valve body is provided with an air inlet connecting the installation cavity and the inside of the shell, and an air outlet connecting the installation cavity and the outside of the shell. By arranging the valve core in the installation cavity, the valve core can block the air inlet, and when the pressure inside the shell rises, the gas inside the shell 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, so that the one-way valve can discharge the gas inside the shell to the outside of the shell.

[0009] In some embodiments, the valve body includes a valve body and a valve cover; the valve body is arranged on the wall portion, and the valve body is provided with the air inlet; along the thickness direction of the wall portion, the valve cover is arranged at one end of the valve body away from the electrode assembly, and the valve cover and the valve body together enclose the installation cavity.

[0010] In the above technical solution, the valve body of the one-way valve is provided with a valve body and a valve cover. The valve cover is connected to the end of the valve body away from the electrode assembly in the thickness direction of the wall so that the valve cover and the valve body jointly define an installation cavity for accommodating the valve core. The one-way valve with this structure arranges the valve body into two parts, thereby facilitating the assembly of the valve core into the installation cavity, which helps to reduce the difficulty of assembling the one-way valve.

[0011] 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.

[0012] In the above technical solution, a first through hole is provided on the valve cover of the valve body to form an air outlet of the valve body, so that the installation cavity of the valve body can be connected with the outside of the outer shell through the first through hole provided on the valve cover. The valve body adopting such a structure can reduce the interference effect of the air outlet on the connection between the valve cover and the valve body, which is conducive to reducing the difficulty of assembling the valve cover and the valve body.

[0013] In some embodiments, the valve cover is connected to the valve body, and the air outlet is a first exhaust gap formed between the valve cover and the valve body.

[0014] In the above technical solution, a first exhaust gap is set between the valve cover and the valve body to form an air outlet of the valve body, so that the installation cavity of the valve body can be connected to the outside of the shell through the first exhaust gap formed between the valve cover and the valve body. The structure is simple and easy to process.

[0015] In some embodiments, the valve cover is connected to the valve body, and a sink is provided at one end of the valve body away from the electrode assembly, and at least a portion of the valve cover is accommodated in the sink.

[0016] In the above technical solution, a recess is provided on the end of the valve body away from the electrode assembly, and at least a portion of the valve cover is accommodated in the recess. The one-way valve adopting this structure can save the space occupied by the valve body in the thickness direction of the wall on the one hand, and can improve the structural stability of the valve cover assembled on the valve body on the other hand, and can play a certain protective role on the valve cover to reduce the wear or damage of the valve cover.

[0017] In some embodiments, along a thickness direction of the wall portion, the valve cover does not extend beyond an end of the valve body away from the electrode assembly.

[0018] In the above technical solution, the valve cover is arranged so as not to extend beyond the end of the valve body away from the electrode assembly in the thickness direction of the wall, so that the valve cover is located as a whole in the recessed groove, thereby further saving the space occupied by the valve body in the thickness direction of the wall, and further improving the protection of the valve cover to reduce the wear or damage of the valve cover.

[0019] In some embodiments, along a 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.

[0020] In the above technical solution, the valve body of the valve body is arranged not to exceed the first surface of the wall away from the electrode assembly in the thickness direction of the wall, so that the valve body does not protrude from the first surface in the thickness direction of the wall. On the one hand, it can save the space occupied by the battery cell in the thickness direction of the wall, and on the other hand, it can reduce the wear or bump between the valve body and the external environment, which is beneficial to improve the protection of the valve body and increase the service life of the one-way valve.

[0021] In some embodiments, 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.

[0022] In the above technical solution, by connecting the valve cover to the wall portion, and the air outlet of the valve body is a second exhaust gap arranged between the valve cover and the wall portion, the battery cell adopting this structure can, on the one hand, expand the space size of the installation cavity formed between the valve cover and the valve body to improve the exhaust efficiency and exhaust smoothness of the one-way valve, and on the other hand, the air outlet of the one-way valve can be directly formed between the valve cover and the wall portion, which is beneficial to reduce the phenomenon that the air outlet is blocked by other components of the battery cell.

[0023] In some embodiments, the valve body is integrally formed with the wall portion.

[0024] In the above technical solution, by arranging the valve body and the wall portion of the valve body as an integrally formed structure, it is beneficial to enhance the structural stability and structural strength of the valve body arranged on the wall portion.

[0025] In some embodiments, the valve core includes an elastic member and a sealing member; the elastic member is arranged in the installation cavity; the sealing member is movably arranged in the installation cavity, and the sealing member is used to seal the air inlet under the action of the elastic member, and is used to open the air inlet under the action of the gas inside the shell.

[0026] In the above technical solution, the valve core of the one-way valve is provided with an elastic part and a sealing part, and the elastic part and the sealing part are both arranged in the installation cavity, so that the elastic part can apply elastic force to the sealing part, so that the sealing part can block the air inlet to prevent the gas outside the shell from entering the interior of the shell, and when the pressure inside the shell rises, the gas inside the shell can act on the sealing part and overcome the elastic force of the elastic part, so that the sealing part can open the air inlet, thereby allowing the gas inside the shell to be discharged through the one-way valve, so that the one-way valve can discharge the gas inside the shell to the outside of the shell, and can prevent the gas outside the shell from entering the interior of the shell.

[0027] In some embodiments, the elastic member is a spring.

[0028] In the above technical solution, a spring is used as the elastic member arranged in the installation cavity. On the one hand, it is convenient to assemble the elastic member and helps to reduce the difficulty of assembling the elastic member in the installation cavity. On the other hand, it can ensure that the direction in which the elastic force applied by the elastic member to the sealing member is relatively stable.

[0029] In some embodiments, the elastic member is made of steel, iron or aluminum.

[0030] In the above technical solution, the elastic member made of steel, iron or aluminum has good toughness and can alleviate the elastic failure phenomenon of the elastic member, which is beneficial to improving the service life of the elastic member.

[0031] In some embodiments, along the thickness direction of the wall portion, the valve cover and the sealing member are spaced apart, two ends of the elastic member are respectively against the valve cover and the sealing member, and the air inlet is arranged on the bottom surface of the installation cavity.

[0032] In the above technical solution, the valve cover and the sealing member are arranged in a structure spaced apart along the thickness direction of the wall, so that the two ends of the elastic member can respectively abut against the valve cover and the sealing member, so that the sealing member can seal the air inlet arranged on the bottom surface of the installation cavity along the thickness direction of the wall under the action of the elastic member. That is to say, the air inlet is arranged at the end of the valve body facing the electrode assembly in the thickness direction of the wall, and the sealing member can move along the thickness direction of the wall and seal the air inlet under the action of the elastic member. The one-way valve with this structure makes it easy for the elastic member to apply elastic force to the sealing member so that the sealing member blocks the air inlet, and can reduce the difficulty of assembling the elastic member.

[0033] In some embodiments, a first guide column is protrudingly provided on a side of the valve cover facing the blocking member, and a portion of the elastic member is sleeved on an outer side of the first guide column.

[0034] In the above technical solution, a first guide column is protruded on the side of the valve cover facing the sealing member, and part of the elastic member is sleeved on the outside of the first guide column. The one-way valve with this structure can, on the one hand, play a certain positioning role on the elastic member through the first guide column, so as to facilitate the assembly of the elastic member, which is beneficial to reducing the difficulty of assembling the elastic member. On the other hand, the first guide column can play a certain guiding role when the elastic member is compressed along the thickness direction of the wall portion, so as to reduce the radial deformation of the elastic member during the compression process, so that the elastic member can be stably compressed along the thickness direction of the wall portion, which is beneficial to improve the reliability of the elastic member, and further reduce the risk of the sealing member accidentally opening the air inlet.

[0035] In some embodiments, the valve cover is connected to the valve body, and the air outlet is a first through hole arranged on the valve cover; wherein, along the thickness direction of the wall portion, the air outlet passes through the first guide column; or, along the radial direction of the first guide column, the air outlet and the first guide column are arranged at intervals.

[0036] In the above technical solution, by setting the air outlet as the first through hole opened on the valve cover, and the first through hole passes through the first guide column along the thickness direction of the wall, the air outlet is located on the inner side of the elastic member, which is conducive to reducing 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 the first through hole opened on the valve cover, and the air outlet is located on the outer side of the first guide column, it is conducive to gas discharge, so as to reduce the phenomenon that the air outlet is blocked by the blocking member.

[0037] In some embodiments, the diameter of the first guide column is D 1 , the inner diameter of the elastic member is D 2 , meet, 0mm<D 2 -D 1 ≤5mm.

[0038] In the above technical scheme, by setting the difference between the inner diameter of the elastic part and the diameter of the first guide post to be greater than 0mm and less than or equal to 5mm, on the one hand, the phenomenon that the elastic part is not convenient to be assembled on the first guide post due to the difference between the inner diameter of the elastic part and the diameter of the first guide post being less than or equal to 0 can be alleviated, so as to reduce the scratching phenomenon in the process of the elastic part being sleeved on the first guide post; on the other hand, the phenomenon that the gap between the elastic part and the first guide post is too large due to the large difference between the inner diameter of the elastic part and the diameter of the first guide post can be alleviated, so as to reduce the radial movement or radial deformation of the elastic part, thereby improving the balance of the elastic force of the elastic part acting on the blocking part, so as to reduce the risk of the blocking part accidentally opening the air inlet.

[0039] In some embodiments, a first limiting groove is provided on a side of the valve cover facing the blocking member, and an end of the elastic member away from the blocking member is inserted into the first limiting groove.

[0040] In the above technical solution, a first limiting groove for inserting the elastic member is further provided on the side of the valve cover facing the sealing member, so as to limit the end of the elastic member against the valve cover, so as to reduce the relative radial slip between the elastic member and the valve cover, thereby improving the balance of the elastic force of the elastic member acting on the sealing member, which is beneficial to improving the reliability of the use of the elastic member.

[0041] In some embodiments, one end of the elastic member away from the blocking member is fixedly connected to the valve cover.

[0042] In the above technical solution, by fixedly connecting one end of the elastic member away from the sealing member to the valve cover, so that the end of the elastic member resting on the valve cover and the valve cover are fixedly connected to each other, the stability of the elastic member resting on the valve cover can be improved, so as to further reduce the relative slippage between the elastic member and the valve cover, and further improve the balance of the elastic force of the elastic member acting on the sealing member.

[0043] In some embodiments, a second guide column is protrudingly provided on a side of the blocking member facing the valve cover, and a portion of the elastic member is sleeved on an outer side of the second guide column.

[0044] In the above technical solution, a second guide column is protruded on the side of the sealing member facing the valve cover, and part of the elastic member is sleeved on the outer side of the second guide column. The one-way valve adopting this structure can, on the one hand, play a certain positioning role for the elastic member through the second guide column, so as to facilitate the assembly of the elastic member, which is beneficial to reducing the difficulty of assembling the elastic member. On the other hand, the second guide column can play a certain guiding role when the elastic member is compressed along the thickness direction of the wall portion, so as to reduce the radial deformation of the elastic member during the compression process, so that the elastic member can be stably compressed along the thickness direction of the wall portion, which is beneficial to improve the reliability of the elastic member, and further reduce the risk of the sealing member accidentally opening the air inlet.

[0045] In some embodiments, the diameter of the second guide column is D 3 , the inner diameter of the elastic member is D 2 , meet, 0mm<D 3 -D 1 ≤5mm.

[0046] In the above technical scheme, by setting the difference between the inner diameter of the elastic part and the diameter of the second guide post to be greater than 0mm and less than or equal to 5mm, on the one hand, the phenomenon that the elastic part is inconvenient to be assembled on the second guide post due to the difference between the inner diameter of the elastic part and the diameter of the second guide post being less than or equal to 0 can be alleviated, so as to reduce the scratching phenomenon in the process of the elastic part being sleeved on the second guide post; on the other hand, the phenomenon that the gap between the elastic part and the second guide post is too large due to the large difference between the inner diameter of the elastic part and the diameter of the second guide post can be alleviated, so as to reduce the radial movement or radial deformation of the elastic part, thereby improving the balance of the elastic force of the elastic part acting on the blocking part, so as to reduce the risk of the blocking part accidentally opening the air inlet.

[0047] In some embodiments, a second limiting groove is provided on a side of the blocking member facing the valve cover, and an end of the elastic member away from the valve cover is inserted into the second limiting groove.

[0048] In the above technical solution, a second limiting groove for inserting the elastic member is provided on the side of the sealing member facing the valve cover, so that a limiting effect can be exerted on the end of the elastic member resting on the sealing member, so as to reduce the relative radial slip between the elastic member and the sealing member, thereby improving the balance of the elastic force of the elastic member acting on the sealing member, which is beneficial to improving the reliability of the use of the elastic member.

[0049] In some embodiments, one end of the elastic member away from the valve cover is fixedly connected to the blocking member.

[0050] In the above technical solution, by fixedly connecting one end of the elastic member away from the valve cover with the sealing member, so that the end of the elastic member resting on the sealing member and the sealing member are fixedly connected to each other, the stability of the elastic member resting on the sealing member can be improved, so as to further reduce the relative slippage between the elastic member and the sealing member, and further improve the balance of the elastic force of the elastic member acting on the sealing member.

[0051] In some embodiments, the blocking member is spaced apart from a side surface of the installation cavity.

[0052] In the above technical solution, by setting the blocking piece and the side surface of the installation cavity at a distance, the scraping between the blocking piece and the side surface of the installation cavity can be reduced when the blocking piece opens or blocks the air inlet along the thickness direction of the wall, thereby reducing the phenomenon of the blocking piece getting stuck or moving unsmoothly, which is beneficial to improving the reliability of the one-way valve.

[0053] In some embodiments, a plurality of limiting protrusions are convexly provided on the outer circumferential surface of the blocking member, and the plurality of limiting protrusions are arranged at intervals along the circumference of the blocking member, and the limiting protrusions cooperate with the side surfaces of the installation cavity for guiding.

[0054] In the above technical solution, a plurality of spaced-apart limiting protrusions are provided on the outer peripheral surface of the blocking piece, and the limiting protrusions cooperate with the side surfaces of the installation cavity for guiding. Thus, when the blocking piece moves along the thickness direction of the wall, the limiting protrusions cooperate with the side surfaces of the installation cavity to provide guidance and limiting effects, thereby improving the stability of the blocking piece moving along the thickness direction of the wall.

[0055] In some embodiments, the sealing member includes a clamping portion and a sealing portion. Along the thickness direction of the wall portion, the two ends of the elastic member respectively abut against the valve cover and the clamping portion. The sealing portion is connected to the side of the clamping portion away from the valve cover, and the sealing portion is used to seal the air inlet.

[0056] In the above technical solution, the sealing member is configured to include a pressing portion and a sealing portion, the pressing portion is arranged on the side of the sealing portion facing the valve cover, the sealing portion is used to seal the air inlet, and the two ends of the elastic member are respectively against the valve cover and the pressing portion, so that the elastic member can exert an elastic force on the sealing portion through the pressing portion, which is beneficial to improve the balance of the elastic force of the elastic member acting on the sealing portion, and further can effectively improve the sealing effect of the sealing portion on the air inlet.

[0057] In some embodiments, the clamping portion has a first abutting surface facing the sealing portion, and the sealing portion has a second abutting surface facing the clamping portion, one of the first abutting surface and the second abutting surface is provided with a snap-fitting groove, and the other is provided with a snap-fitting portion, and the snap-fitting portion is snap-fitted with the snap-fitting groove.

[0058] In the above technical solution, the clamping portion and the sealing portion have a first abutting surface and a second abutting surface facing each other. A snap-fit ​​groove is provided on one of the first abutting surface and the second abutting surface, and a snap-fit ​​portion that snaps into engagement with the snap-fit ​​groove is correspondingly provided on the other, thereby improving the structural stability of the sealing portion provided on the clamping portion, thereby reducing the radial slippage of the sealing portion relative to the clamping portion, and further facilitating improving the sealing effect of the sealing portion on the air inlet, thereby reducing the phenomenon of the air inlet being accidentally opened.

[0059] In some embodiments, the sealing portion is bonded to the pressing portion.

[0060] 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 is beneficial to reduce the risk of the sealing part and the pressing part being separated from each other, so as to improve the reliability of the sealing part in blocking the air inlet. On the other hand, it is easy to realize the assembly connection between the sealing part and the pressing part, which is beneficial to reduce the difficulty of assembly between the sealing part and the pressing part.

[0061] In some embodiments, the sealing portion is made of EPDM, fluororubber or Teflon.

[0062] In the above technical solution, the sealing part is made of EPDM, fluororubber or Teflon, so that the sealing part has good corrosion resistance, which can effectively alleviate the phenomenon of the sealing part being corroded by the electrolyte, thereby helping to improve the service life of the sealing part, and can reduce the phenomenon of the sealing part blocking the air inlet ineffectively due to the corrosion of the sealing part.

[0063] In some embodiments, along the thickness direction of the wall portion, a size of a gap between the valve cover and the blocking member is L, satisfying 0mm<L≤2mm.

[0064] In the above technical solution, by setting the size of the gap between the valve cover and the sealing piece in the thickness direction of the wall to be greater than 0mm and less than or equal to 2mm, on the one hand, the obstruction of the valve cover to the sealing piece can be reduced, so that there is space between the valve cover and the sealing piece for the sealing piece to move along the thickness direction of the wall, so that when the gas inside the shell pushes the sealing piece, the sealing piece can open the air inlet for exhaust. 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 piece, which is beneficial to improving the space utilization rate of the battery cell.

[0065] In some embodiments, the valve body is connected to the wall portion by welding.

[0066] In the above technical solution, the structural stability and strength of the valve body connected to the wall portion can be effectively improved by welding the valve body to the wall portion, thereby reducing the risk of the valve body and the wall portion falling off during use.

[0067] In some embodiments, the wall portion is provided with a mounting hole, at least a portion of the valve body is accommodated in the mounting hole, the hole 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 is welded to the second connecting surface.

[0068] In the above technical solution, a mounting hole of the valve body for accommodating the valve body is provided on the wall portion, and the valve body has a second connecting surface, and the second connecting surface is welded to the first connecting surface of the hole wall surface of the mounting hole to realize the assembly of the one-way valve to the wall portion. The structure in which the first connecting surface and the second connecting surface are welded and connected in an annular shape can improve the connection reliability between the valve body and the wall portion on the one hand, and can improve the sealing effect between the valve body and the hole wall surface of the mounting hole on the other hand.

[0069] In some embodiments, the first connection surface matches the second connection surface, and both the first connection surface and the second connection surface are disposed at an acute angle to the central axis of the mounting hole.

[0070] In the above technical solution, the first connecting surface and the second connecting surface are set to be structures that fit together, and the first connecting surface and the second connecting surface are both set at an acute angle to the central axis of the mounting hole, so that the first connecting surface and the second connecting surface have the same shape and abut against each other, and the first connecting surface and the second connecting surface are both inclined structures, so that when the valve body is assembled into the mounting hole, it is convenient for the first connecting surface and the second connecting surface to abut against each other, and the tightness of the mutual fit between the first connecting surface and the second connecting surface can be improved, which is beneficial to reducing the phenomenon of a gap between the first connecting surface and the second connecting surface, and can effectively improve the welding quality of the first connecting surface and the second connecting surface.

[0071] 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, and the hole diameter of the first hole segment is larger than the hole 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.

[0072] In the above technical scheme, the mounting hole is provided with a first hole section and a second hole section arranged along the thickness direction of the wall portion, the first hole section is located on the outer side of the second hole section away from the electrode assembly, and the aperture of the first hole section is larger than the aperture of the second hole section to form a mounting hole with a stepped hole structure, by setting the hole wall surface of the first hole section as the first connecting surface, and the valve body has a connecting portion accommodated in the first hole section, and the outer peripheral surface of the connecting portion is the second connecting surface, so that it is convenient to assemble the valve body of the valve body of the one-way valve from the outer side of the wall portion into the mounting hole, so that after the connecting portion of the valve body is accommodated in the first hole section, the first connecting surface can abut against the second connecting surface, so that the mounting hole and the connecting portion of the stepped hole structure can cooperate to play a certain limiting and positioning role on the valve body, which is conducive to reducing the difficulty of assembling the valve body into the mounting hole.

[0073] In some embodiments, along the thickness direction of the wall portion, the end surface of the valve body facing away from the electrode assembly is connected to the second connecting surface, and a first stress release groove is provided on the end surface of the valve body facing away from the electrode assembly.

[0074] In the above technical solution, a first stress release groove is provided on the end face of the valve body away from the electrode assembly in the thickness direction of the wall portion, so that the welding stress generated by the welding of the first connecting surface and the second connecting surface can be released through the first stress release groove, thereby reducing the influence of the welding stress on the weld connecting the first connecting surface and the second connecting surface, reducing the risk of weld cracking, and further reducing the risk of sealing failure at the weld.

[0075] In some embodiments, the first stress relief groove is arranged around the central axis of the mounting hole.

[0076] In the above technical solution, by setting the first stress release groove as an annular structure arranged around the central axis of the mounting hole, it is beneficial to enhance the absorption effect of the first stress release 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 influence of the welding stress on other components such as the valve core of the one-way valve.

[0077] In some embodiments, the battery cell also includes an insulating member; the insulating member is arranged 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 main body portion and a receiving portion, the main body portion is arranged on the side of the wall portion facing the electrode assembly, the receiving portion is connected to the main body portion, and the part of the one-way valve extending to the inside of the outer shell is received in the receiving portion.

[0078] In the above technical solution, the battery cell is also provided with an insulating part, which includes a main body portion and a receiving portion that are connected to each other. The main body portion is arranged 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 main body portion, and the receiving portion can accommodate the part of the one-way valve protruding from the second surface of the wall portion to avoid and protect the one-way valve, and can insulate and isolate the electrode assembly and the one-way valve to reduce the risk of short circuit between the one-way valve and the electrode assembly.

[0079] In some embodiments, the one-way valve includes a valve body, which 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, and the air inlet is configured to allow gas inside the shell to discharge; wherein the accommodating portion is provided with a second through hole, and the second through hole is connected to the air inlet.

[0080] In the above technical solution, a second through hole is provided on the accommodating portion so that the second through hole can connect the interior of the shell and the interior of the accommodating portion, and the air inlet of the valve body of the one-way valve can be connected with the interior of the shell through the second through hole, so that the gas inside the shell can enter the accommodating portion through the second through hole and then be discharged to the outside of the shell through the one-way valve. Therefore, there is no need for the gas to enter the accommodating portion through the gap between the main body and the wall portion and then be discharged through the one-way valve, which is beneficial to improving the smoothness of the one-way valve to discharge the gas inside the shell.

[0081] In some embodiments, along the thickness direction of the wall portion, the air inlet is arranged at one end of the valve body facing the electrode assembly; the accommodating portion includes a first wall and a second wall, the first wall is arranged around the valve body, and 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 an end of the first wall away from the main body portion; wherein the second through hole is arranged in the first wall and / or the second wall.

[0082] In the above technical solution, the accommodating portion is provided with a first wall and a second wall which are connected to each other, the first wall is arranged around the valve body, and the second wall is located at one 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 enclose a accommodating portion for accommodating the portion of the valve body extending to the inside of the outer shell. By arranging the second through hole of the accommodating portion on the first wall, it is beneficial to increase the path of the gas entering the air inlet of the valve body from the second through hole, so as to alleviate the phenomenon of electrolyte overflowing with the gas. By arranging the second through hole of the accommodating portion on the second wall, it is beneficial to realize the corresponding arrangement of the air inlet and the second through hole, so as to improve the smoothness of the one-way valve in discharging the gas inside the outer shell.

[0083] In some embodiments, the receiving portion is integrally formed with the main body portion.

[0084] In the above technical solution, the main body and the receiving portion of the insulating member are arranged as an integrally formed structure, thereby facilitating the improvement of the structural strength and structural stability of the receiving portion connected to the main body.

[0085] In some embodiments, the receiving portion is separately arranged from the main body portion.

[0086] In the above technical solution, by arranging the main body and the accommodating portion of the insulating member as a separate structure, it is helpful to reduce the difficulty of processing the insulating member, thereby reducing the manufacturing cost of the insulating member.

[0087] In some embodiments, the accommodating portion also includes a flange portion; the flange portion is connected to an end of the first wall away from the second wall, at least a portion of the flange portion is stacked with the main body portion, and the flange portion abuts against a side of the main body portion facing the wall portion.

[0088] In the above technical solution, the accommodating portion is also provided with a flange portion, and the flange portion is connected to an end of the first wall away from the second wall, so that at least part of the flange portion is stacked with the main body portion in the thickness direction of the wall portion, and the flange portion abuts against the side of the main body portion facing the wall portion, so as to realize the connection of the accommodating portion to the main body portion, which has a simple structure and is easy to assemble.

[0089] In some embodiments, along the thickness direction of the wall portion, a receiving groove is provided on the surface of the main body portion facing the wall portion, and the flange portion is received in the receiving groove.

[0090] In the above technical solution, by providing an accommodating groove for accommodating the flange portion on the surface of the main body facing the wall portion, the space occupied by the flange portion and the main body in the thickness direction of the wall portion can be reduced, and the interference effect of the flange portion on the mutual abutment between the main body and the wall portion can be reduced.

[0091] In some embodiments, along the thickness direction of the wall portion, a surface of the flange portion facing the wall portion is flush with a surface of the main body portion facing the wall portion.

[0092] In the above technical solution, by setting the surface of the flange part facing the wall part and the surface of the main body part facing the wall part to be flush with each other, the wall part and the bottom surface of the accommodating groove can cooperate to play a certain clamping and limiting role on the flange part, so as to reduce the phenomenon of movement of the accommodating part along the thickness direction of the wall part.

[0093] In some embodiments, the battery cell also includes a shielding member; the shielding member is installed on the wall portion, and along the thickness direction of the wall portion, the shielding member is located on the side of the one-way valve away from the electrode assembly, and the shielding member covers the one-way valve; wherein the one-way valve has an outlet, and the outlet is used to discharge the gas inside the outer shell, an exhaust channel is formed between the shielding member and the wall portion or an exhaust channel is provided on the shielding member, and the exhaust channel connects the outlet and the outside of the outer shell.

[0094] In the above technical solution, the battery cell is also provided with a shielding member located on the side of the one-way valve away from the electrode assembly. The shielding member is installed on the wall portion, and the shielding member covers the one-way valve, so that the shielding member can provide certain 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 can reduce the risk of impurities or particulate matter in the external environment entering the one-way valve, which is beneficial to increasing the service life of the one-way valve. On the other hand, covering the one-way valve by the shielding member can enhance the aesthetics of the outer surface of the battery cell. On the other hand, it is convenient to connect other components such as the detection element on the side of the shielding member away from the one-way valve, so as to reduce the interference of the area where the one-way valve is set on the wall portion on the connection detection element and other components.

[0095] 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.

[0096] In the above technical solution, by arranging a mounting groove on the first surface of the wall portion away from the electrode assembly, and at least partially accommodating the shielding member in the mounting groove, on the one hand, the space occupied by the shielding member and the wall portion in the thickness direction of the wall portion can be reduced, which is beneficial to optimizing the volume of the battery cell; on the other hand, the mounting groove can play a certain positioning and limiting role for the shielding member, which is beneficial to reducing the difficulty of assembling the shielding member connected to the wall portion.

[0097] In some embodiments, the exhaust channel includes a third exhaust gap, the third exhaust gap is formed between the shielding member and a groove side surface of the mounting groove, and the third exhaust gap is used to connect the air outlet and the outside of the housing.

[0098] In the above technical solution, a third exhaust gap connected to the outside of the shell is formed between the shielding member and the side surface of the mounting groove, so that the gas discharged from the one-way valve can be discharged to the outside of the shell through the third exhaust gap. The battery cell adopting this structure does not need to have a hole on the shielding member, which is beneficial to reduce the processing difficulty and can improve the appearance of the battery cell.

[0099] In some embodiments, the outer peripheral surface of the shielding member includes a first corner surface and at least two first side surfaces, and the first corner surface connects 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, and the second corner surface connects two adjacent second side surfaces, each second side surface is connected to one first side surface, and the third exhaust gap is formed between the second corner surface and the first corner surface.

[0100] In the above technical solution, two adjacent first side surfaces in the outer peripheral surface of the shielding member are connected by a first corner surface, and two connected second side surfaces in the groove 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, a third exhaust gap is formed at the corner of the shielding member and the mounting groove. On the one hand, it is convenient to form the third exhaust gap between the outer peripheral surface of the shielding member and the groove side surface of the mounting groove, and the structure is simple and easy to implement. On the other hand, while realizing the formation of the third exhaust gap between the outer peripheral surface of the shielding member and the groove side surface of the mounting groove, it is beneficial to increase the connection area between the outer peripheral surface of the shielding member and the groove side surface of the mounting groove, and it is beneficial to improve the firmness of the shielding member connected to the wall.

[0101] 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.

[0102] In the above technical solution, by setting 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.

[0103] In some embodiments, the first side surface is connected to the second side surface by welding.

[0104] In the above technical solution, by setting the first side surface and the second side surface as a structure welded to each other, it is helpful to improve the connection firmness between the shielding member and the groove side surface of the installation groove, so as to improve the structural stability of the shielding member assembled to the wall.

[0105] In some embodiments, the cross-section of the shielding member in a direction perpendicular to the thickness of the wall portion is rectangular, the outer peripheral surface of the shielding member includes four first side surfaces and four first corner surfaces, and the third exhaust gap is formed at at least one first corner surface.

[0106] 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 four right angles of the shielding member, the structure is simple and easy to manufacture.

[0107] In some embodiments, the exhaust channel further includes a fourth exhaust gap, the fourth exhaust gap is formed between the shielding member and the bottom surface of the mounting groove, and the fourth exhaust gap communicates with the third exhaust gap and the air outlet.

[0108] In the above technical solution, the exhaust channel also includes a fourth exhaust gap formed between the covering member and the bottom surface of the mounting groove, and the fourth exhaust gap connects the third exhaust gap and the air outlet to alleviate the phenomenon of exhaust obstruction between the air outlet and the third exhaust gap caused by the covering member abutting against the bottom surface of the mounting groove, thereby improving the smoothness of gas discharge from the air outlet of the one-way valve to the third exhaust gap.

[0109] 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 overlaps the bottom surface of the mounting groove, the third surface is provided with a first groove, and the fourth exhaust gap is formed between the bottom surface of the first groove and the bottom surface of the mounting groove.

[0110] In the above technical solution, the third surface of the shielding member is overlapped on the bottom surface of the mounting groove so that the shielding member is against the bottom surface of the mounting groove, so as to improve the structural stability and reliability of the shielding member installed in the mounting groove. In addition, a first groove is provided on the third surface so that 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 shell, so that the shielding member can be against the bottom surface of the mounting groove and the third exhaust gap can be connected with the outlet through the first groove.

[0111] In some embodiments, a plurality of the third exhaust gaps are formed between the shielding member and the side surface of the mounting groove, and the plurality of the third exhaust gaps are arranged at intervals along the circumference of the shielding member. A plurality of the first grooves are provided on the third surface, and each of the third exhaust gaps is connected to one of the first grooves.

[0112] In the above technical solution, a plurality of third exhaust gaps are formed between the shielding member and the groove side surface of the mounting groove, and each third exhaust gap is connected to a first groove, thereby facilitating further improving the exhaust efficiency.

[0113] In some embodiments, the third surface is further provided with a second groove, a plurality of the first grooves are arranged around the second groove and are all connected to the second groove, and the second groove is connected to the air outlet.

[0114] In the above technical solution, a second groove is provided on the third surface of the shielding member facing the one-way valve, the second groove is connected to the air outlet of the one-way valve, and a plurality of first grooves are provided around the second groove and are connected to the second groove, so that the gas discharged from the air outlet of the one-way valve can enter the second groove and then pass through the plurality of first grooves and then respectively pass through the corresponding third exhaust gaps to be discharged to the outside of the outer shell, which is beneficial to improving the exhaust efficiency and can alleviate the phenomenon of gas accumulation between the shielding member and the one-way valve.

[0115] In some embodiments, along the thickness direction of the wall portion, the gas outlet is arranged at an end of the one-way valve away from the electrode assembly, the gas outlet is arranged facing the second groove, and the projection of the gas outlet is located in the second groove.

[0116] In the above technical solution, the air outlet of the one-way valve and the second groove are arranged to face each other, and the projection of the air outlet in the thickness direction of the wall is located in the second groove, so that the second groove is a structure covering the air outlet in the thickness direction of the wall, so that the gas discharged from the air outlet of the one-way valve can directly enter the second groove, which is beneficial to improving the exhaust smoothness and exhaust efficiency.

[0117] In some embodiments, along the thickness direction of the wall portion, the shielding member does not extend beyond the first surface.

[0118] In the above technical solution, by setting the shielding member not to exceed the first surface of the wall away from the electrode assembly in the thickness direction of the wall, the shielding member can be protected to a certain extent by the installation groove, so as to further reduce the wear of the shielding member.

[0119] In some embodiments, the shielding member has a fourth surface facing away from the one-way valve, and the fourth surface is flush with the first surface.

[0120] 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 convenient to set information codes or connect other components such as detection elements on the fourth surface of the shielding member.

[0121] In some embodiments, the shielding member is fixedly connected to the wall portion.

[0122] In the above technical solution, by setting the shielding member as a structure fixedly connected to the wall portion, it is helpful to reduce the risk of the shielding member detaching from the wall portion during use, and can improve the firmness of the connection between the shielding member and the wall portion, so as to facilitate setting information codes on the shielding member or connecting other components such as detection elements.

[0123] In some embodiments, the battery cell also includes a protective patch; the protective patch is arranged on the side of the wall portion away from the electrode assembly, and an information collection hole is provided on the protective patch that penetrates the protective patch, and the projection of the information collection hole in the thickness direction of the wall portion is located within the shielding member.

[0124] In the above technical solution, the battery cell is also provided 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 collection hole on the protective patch, and the projection of the information collection hole in the thickness direction of the wall is located within the shielding member, the information collection hole is a structure corresponding to the shielding member. On the one hand, it is convenient to set information codes on the shielding member or connect components such as detection elements for sampling, so as to reduce the damage and pulling of the one-way valve by the detection elements for sampling. On the other hand, the aesthetics of the outer surface of the battery cell can be improved. On the other hand, by setting the information collection holes of the shielding member and the protective patch correspondingly, the area where the battery cell is exhausted through the one-way valve can be set corresponding to the area where the information collection hole is set on the protective patch, thereby saving the space occupied by the information collection hole and the shielding member on the outer surface of the outer shell, which is beneficial to improving the integration of the battery cell.

[0125] In some embodiments, an exhaust port communicating with the outside of the housing is formed at one end of the exhaust channel, and the protective patch covers the exhaust port.

[0126] 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 shielding member and the wall, on the one hand, it can shield the exhaust channel to improve the aesthetics of the outer surface of the battery cell; on the other hand, it can reduce the risk of impurities or particulate matter in the external environment entering the exhaust channel through the exhaust port and clogging the exhaust channel, which is beneficial to improving the reliability of the battery cell.

[0127] In some embodiments, 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; wherein the adhesive layer is provided with a first avoidance hole at a position corresponding to the information collection hole, and along the thickness direction of the wall portion, the projections of the information collection hole and the exhaust port are both located within the first avoidance hole.

[0128] In the above technical solution, an adhesive layer is provided on the side of the protective patch facing the wall so that the protective patch can be bonded to the wall through the adhesive layer, which is conducive to reducing the difficulty of assembling the protective patch and improving the connection stability of the protective patch set on the wall. In addition, a first avoidance hole is provided at the position of the adhesive layer corresponding to the information collection hole, and the projections of the information collection 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 avoidance hole, so as to reduce the obstruction of the exhaust port of the exhaust channel by the adhesive layer, so that the gas discharged through the exhaust channel can enter the information collection hole through the gap between the protective patch and the wall and then be discharged, thereby realizing the bonding of the protective patch to the wall and reducing the impact on the exhaust of the one-way valve.

[0129] In some embodiments, an exhaust port connected to the outside of the shell is formed at one end of the exhaust channel; the battery cell also includes a protective patch, which is arranged on a side of the wall away from the electrode assembly, and the protective patch covers the exhaust port.

[0130] In the above technical solution, a protective patch is arranged on the side of the wall portion away from the electrode assembly, and the protective patch covers the exhaust port at one end of the exhaust channel formed between the shielding member and the wall portion. On the one hand, it can shield the exhaust channel to enhance the aesthetics of the outer surface of the battery cell. On the other hand, it can reduce the risk of impurities or particulate matter in the external environment entering the exhaust channel through the exhaust port and clogging the exhaust channel, which is beneficial to improving the reliability of the battery cell.

[0131] In some embodiments, the wall portion is provided with a mounting hole, at least a portion of the one-way valve is mounted in the mounting hole, and the mounting hole is a liquid injection hole of the battery cell.

[0132] In the above technical solution, by setting the mounting hole for assembling the one-way valve as the liquid injection hole, liquid can be injected into the outer shell through the mounting hole before the one-way valve is assembled in the mounting hole, thereby eliminating the need to open a separate liquid injection hole on the outer shell, which is beneficial to improving the production efficiency of the battery cell and reducing the manufacturing cost of the battery cell.

[0133] In some embodiments, the outer shell includes a shell and an end cover; the interior of the shell forms a accommodating cavity with an opening, and the accommodating cavity is used to accommodate the electrode assembly; the end cover closes the opening; wherein the end cover is the wall portion; or, the shell includes the wall portion.

[0134] In the above technical solution, by setting the wall of the shell as an end cover for closing the opening of the shell, the battery cell with this structure is easy to install the one-way valve on the end cover, which is conducive to reducing the difficulty of assembling the battery cell and improving the production efficiency of the battery cell. Similarly, by setting the wall of the shell as a wall of the shell, the battery cell with this structure can reduce the influence of the stress generated when the end cover and the shell are connected to each other on the one-way valve, so as to alleviate the phenomenon of damage to the one-way valve, thereby improving the stability and service life of the battery cell.

[0135] In some embodiments, the battery cell further includes a pressure relief mechanism; the pressure relief mechanism is disposed on the outer casing, and the pressure relief mechanism is configured to actuate and release the internal pressure of the battery cell when the battery cell thermally runs away, and the actuation pressure of the pressure relief mechanism is greater than the opening pressure of the one-way valve.

[0136] In the above technical solution, by setting the opening pressure of the one-way valve to open the exhaust to be lower than the actuating pressure of the pressure relief mechanism for pressure relief, when gas is generated inside the shell during normal use of the battery cell, it can be discharged to the outside of the shell through the one-way valve, so as to alleviate the phenomenon that the pressure relief mechanism actuates the pressure relief in advance before the thermal runaway of the battery cell due to the increase of the internal air pressure of the battery cell, thereby effectively improving the use stability of the battery cell, thereby improving the service life and reliability of the battery cell.

[0137] In some embodiments, an exhaust rate of the one-way valve is less than an exhaust rate of the pressure relief mechanism.

[0138] In the above technical solution, by setting the exhaust rate of the one-way valve to be lower than the exhaust rate of the pressure relief mechanism, the phenomenon that the one-way valve exhausts too quickly and the pressure relief mechanism cannot be actuated to open can be alleviated when the battery cell has thermal runaway. This allows the pressure relief mechanism to actuate and stably discharge the internal pressure of the battery cell when the battery cell has thermal runaway, thereby helping to reduce the risk of fire and explosion of the battery cell when the battery cell has thermal runaway.

[0139] 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 also includes an electrode terminal and a current collecting member, the electrode terminal is installed on the wall portion, the electrode terminal is used to output or input electrical energy of the battery cell, the current collecting member connects the electrode terminal and the electrode assembly, and at least a portion of the current collecting member is arranged between the wall portion and the electrode assembly; wherein the current collecting member is provided with a avoidance groove, and the one-way valve extends into the avoidance groove along the thickness direction of the wall portion.

[0140] In the above technical solution, the battery cell is also provided with an electrode terminal for inputting or outputting the electric energy of the battery cell, and the current collecting component connects the electrode assembly and the electrode terminal, so that the connection difficulty between the electrode assembly and the electrode terminal can be reduced through the current collecting component. In addition, by providing an avoidance groove on the current collecting component, and the one-way valve extending into the avoidance groove in the thickness direction of the wall portion, on the one hand, the current collecting component can avoid the one-way valve through the avoidance groove to reduce the interference between the current collecting component and the one-way valve, and on the other hand, it can save the space occupied by the one-way valve and the current collecting component inside the shell, which is conducive to improving the energy density of the battery cell.

[0141] In a second aspect, an embodiment of the present application further provides a battery, comprising the above-mentioned battery cell.

[0142] In a third aspect, an embodiment of the present application further provides an electrical device, comprising the above-mentioned battery cell, wherein the battery cell is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0143] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0144] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0145] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0146] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0147] Figure 4 An exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0148] Figure 5 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0149] Figure 6 A schematic diagram of the structure of a one-way valve provided in some embodiments of the present application;

[0150] Figure 7 An exploded view of the structure of a one-way valve provided in some embodiments of the present application;

[0151] Figure 8 A cross-sectional view of a one-way valve provided in some embodiments of the present application;

[0152] Fig. 9 A schematic diagram of the structure of a one-way valve provided in some other embodiments of the present application;

[0153] Fig.10 A partial cross-sectional view of a battery cell provided for some other embodiments of the present application;

[0154] Fig.11 A schematic diagram of the structure of a one-way valve provided in some further embodiments of the present application;

[0155] Fig.12 A cross-sectional view of a one-way valve provided in some further embodiments of the present application;

[0156] Fig.13 A cross-sectional view of a one-way valve provided in some other embodiments of the present application;

[0157] Fig.14 A cross-sectional view of a one-way valve provided in yet other embodiments of the present application;

[0158] Fig.15 A schematic structural diagram of a blocking member of a one-way valve provided in yet other embodiments of the present application;

[0159] Fig.16 A partial cross-sectional view of a wall portion of a housing of a battery cell provided in some embodiments of the present application;

[0160] Fig.17 A partial cross-sectional view of an insulating member of a battery cell provided in some embodiments of the present application;

[0161] Fig.18 A partial cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0162] Fig.19 A partial cross-sectional view of an insulating member of a battery cell provided in some further embodiments of the present application;

[0163] Fig. 20 A top view of a battery cell (after removing the protective patch) provided in some embodiments of the present application;

[0164] Fig.21 for Fig. 20 A partial enlarged view of the battery cell at A shown;

[0165] Fig. 22 A schematic diagram of the connection between a shielding member and a wall portion of a battery cell provided in some embodiments of the present application;

[0166] Fig.23 A schematic diagram of the structure of the shielding member provided in some embodiments of the present application in other embodiments;

[0167] Fig.24A schematic diagram of the structure of the shielding member provided in some embodiments of the present application in other embodiments;

[0168] Fig.25 A bottom view of a shielding member of a battery cell provided in some embodiments of the present application;

[0169] Fig.26 A schematic diagram of the connection between the protective patch and the wall provided in some embodiments of the present application;

[0170] Fig. 27 A schematic diagram of the connection between the protective patch and the adhesive layer provided in some embodiments of the present application;

[0171] Fig.28 A schematic diagram of the partial structure of a battery cell provided in some embodiments of the present application.

[0172] Icon: 1000-vehicle; 100-battery; 10-box; 11-first box body; 12-second box 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 groove; 2113a-second corner surface; 2113b-second side surface; 2114-second surface; 212-housing; 2121-opening; 213-end cover; 22-electrode assembly; 22 1-ear; 23-check valve; 231-valve body; 2311-installation cavity; 2312-air inlet; 2313-air outlet; 2314-valve body; 2314a-sink; 2314b-second connecting surface; 2314c-connecting part; 2314d-first stress release groove; 2315-valve cover; 2315a-convex part; 2315b-first guide column; 2315c-first limit groove; 232-valve core; 2321-elastic member; 2322-blocking member; 2322a-pressing part; 2322b-sealing part; 2322c - second guide column; 2322d - second limiting groove; 2322e - limiting protrusion; 2322f - first abutting surface; 2322g - second abutting surface; 2322h - clamping groove; 2322k - clamping part; 24 - electrode terminal; 25 - pressure relief mechanism; 26 - insulating member; 261 - main body; 2611 - assembly hole; 2612 - receiving groove; 262 - receiving part; 2621 - second through hole; 2622 - first wall; 2623 - second wall; 2624 - flange part; 27 - shielding member; 271 - first corner surface; 272 - second One side; 273-second groove; 274-abutment portion; 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 collection hole; 292-second avoidance hole; 293-third avoidance hole; 30-adhesive layer; 301-first avoidance hole; 31-current collecting component; 311-avoidance groove; 200-controller; 300-motor; X-thickness direction of the wall. DETAILED DESCRIPTION

[0173] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0174] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0175] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0176] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0177] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0178] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0179] The term "plurality" used in the present application refers to two or more (including two).

[0180] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0181] The battery cell can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead storage battery, etc., which is not limited in the embodiments of the present application.

[0182] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0183] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet 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.

[0184] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is disposed on either or both of the two facing surfaces of the positive electrode current collector.

[0185] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, 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. may be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector may 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.).

[0186] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxide (such as LiCoO 2 ), lithium nickel oxide (such as LiNiO 2 ), lithium manganese oxide (such as LiMnO 2 、LiMn2O 4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O 2 (Also referred to as NCM 333 )、LiNi 0.5 Co 0.2 Mn 0.3 O 2 (Also referred to as NCM 523 )、LiNi 0.5 Co 0.25 Mn 0.25 O 2 (Also referred to as NCM 211 )、LiNi 0.6 Co 0.2 Mn 0.2 O 2 (Also referred to as NCM 622 )、LiNi 0.8 Co 0.1 Mn 0.1 O 2 (Also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O 2 ) and at least one of its modified compounds.

[0187] In some embodiments, the positive electrode may be a foamed metal. The foamed metal may be a nickel foam, a copper foam, an aluminum foam, an alloy foam, or a carbon foam. When the foamed metal is used as the positive electrode, the positive electrode active material may not be provided on the surface of the foamed metal, but of course, the positive electrode active material may also be provided. As an example, a lithium source material, potassium metal or sodium metal may also be filled or / and deposited in the foamed metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0188] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0189] 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, aluminum or stainless steel treated with silver, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. can be used. The foamed metal can be a foamed nickel, a foamed copper, a foamed aluminum, a foamed alloy, or a foamed carbon, etc. The composite current collector can include a polymer material base and a metal layer. The composite current collector 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.).

[0190] 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.

[0191] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is disposed on either or both of the two facing surfaces of the negative electrode current collector.

[0192] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells known in the art. 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, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0193] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0194] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0195] In some embodiments, the separator is a separator membrane. There may be many types of separator membranes, and any known porous separator membrane with good chemical stability and mechanical stability may be selected.

[0196] As an example, the material of the separator may include at least one of glass fiber, non-woven 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 may be attached to the surface of the positive and negative electrodes.

[0197] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0198] In some embodiments, the battery cell further includes an electrolyte, which plays a role in conducting ions between the positive and negative electrodes. The electrolyte can be liquid, gel or solid. Among them, the liquid electrolyte includes an electrolyte salt and a solvent.

[0199] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bisfluorosulfonyl imide, lithium bistrifluoromethanesulfonyl imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalatoborate, lithium dioxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0200] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, cyclopentane, dimethyl sulfone, methyl ethyl sulfone and diethyl sulfone. The solvent may also be an ether solvent. The ether solvent may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether and crown ether.

[0201] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0202] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0203] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, and the like.

[0204] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0205] As an example, the composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0206] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into the wound structure.

[0207] In some embodiments, the electrode assembly is a laminate structure.

[0208] As an example, a plurality of positive electrode sheets and a plurality of negative electrode sheets may be provided respectively, and the plurality of positive electrode sheets and the plurality of negative electrode sheets may be alternately stacked.

[0209] As an example, a plurality of positive electrode sheets may be provided, and the negative electrode sheet may be folded to form a plurality of stacked folded segments, with a positive electrode sheet being sandwiched between adjacent folded segments.

[0210] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of folded sections that are stacked.

[0211] As an example, a plurality of separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0212] As an example, the separator may be disposed continuously, and may be disposed between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0213] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0214] In some embodiments, the electrode assembly is provided with tabs, which can lead current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0215] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film.

[0216] As an example, the battery cell may be a cylindrical battery cell, a prismatic battery cell, a soft-pack battery cell or a battery cell of other shapes. The prismatic battery cell includes but is not limited to a square-shell battery cell, a blade-shaped battery cell, a polygonal battery, such as a hexagonal battery, etc.

[0217] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity.

[0218] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0219] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0221] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0222] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0223] Batteries have outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient. They are an important part of the development of new energy today. The development of battery technology must consider many design factors at the same time, such as performance parameters such as energy density, cycle life, discharge capacity, and charge and discharge rate. In addition, battery safety must also be considered. With the rapid development and increasing demand for batteries, the demand for battery life and reliability has also increased.

[0224] In battery technology, for general battery cells, in order to ensure the safety of battery cells, a pressure relief mechanism is usually provided on the outer shell of the battery cell to release the internal pressure of the battery cell through the pressure relief mechanism, thereby effectively improving the safety of the battery cell. In the related art, a certain amount of gas is generated during the use of the battery cell, causing the gas pressure in the outer shell of the battery cell to rise, which may cause the pressure relief mechanism of the battery cell to be activated and release pressure in advance during use, resulting in poor stability of the battery cell, which is not conducive to improving the service life and reliability of the battery cell.

[0225] Based on the above considerations, in order to solve the problems of short service life and low reliability of battery cells, an embodiment of the present application provides a battery cell, the battery cell includes a shell, an electrode assembly and a one-way valve, the shell has a wall portion, the electrode assembly is accommodated in the shell, the one-way valve is arranged on the wall portion, and the one-way valve is used to discharge the gas inside the shell.

[0226] In a battery cell of this structure, a one-way valve is provided on the wall of the outer shell so that the one-way valve can be opened in one direction and discharge the gas inside the outer shell to the outside of the outer shell. Therefore, when gas is generated inside the outer shell during normal use of the battery cell, it can be discharged to the outside of the outer shell through the one-way valve, so as to alleviate the phenomenon that the internal pressure of the battery cell reaches the threshold value in advance due to the increase of the internal air pressure of the battery cell, thereby causing the battery cell to actuate and release pressure in advance, thereby effectively improving the use stability of the battery cell, thereby improving the service life and reliability of the battery cell.

[0227] The battery cells disclosed in the embodiments of the present application can be used in, but not limited to, electrical devices such as vehicles, ships or aircraft, and can also be used in energy storage devices. A power supply system comprising the battery cells and batteries disclosed in the present application can be used to form the electrical device, which is helpful to alleviate the phenomenon of premature valve opening and pressure relief during the use of the battery cells, thereby improving the service life and reliability of the battery cells.

[0228] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0229] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device in an embodiment of the present application.

[0230] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0231] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0232] Please refer to Figure 2 , Figure 2 The structure of the battery 100 provided in some embodiments of the present application is an exploded view. The battery 100 may include a housing 10 and a battery cell 20 , wherein the battery cell 20 is used to be accommodated in the housing 10 .

[0233] Among them, the box body 10 is used to provide an assembly space for the battery cell 20, and the box body 10 can adopt a variety of structures. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, and the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20. The second box body 12 may be a hollow structure with one end open, and the first box body 11 may 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 jointly define an assembly space; in other embodiments, the first box body 11 and the second box body 12 may also 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. Of course, the box body 10 formed by the first box body 11 and the second box body 12 may be in a variety of shapes, such as a cylinder or a cuboid. Exemplarily, in Figure 2 In the embodiment, the box body 10 is in the shape of a rectangular parallelepiped.

[0234] Optionally, in the battery 100, the battery cell 20 contained in the box 10 may be one or more. When there are more than one battery cell 20 contained in the box 10, the multiple battery cells 20 may be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 may be directly connected in series, in parallel, or in mixed connection, and then the whole module composed of the multiple battery cells 20 may be contained in the box 10; of course, in some embodiments, the battery 100 may also be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules may be connected in series, in parallel, or in mixed connection to form a whole, and then contained in the box 10.

[0235] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which is disposed in the housing 10 and connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0236] Each battery cell 20 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery or a magnesium-ion battery, but is not limited thereto. The battery cell 20 may be cylindrical, flat, rectangular or in other shapes. Figure 2 In the figure, the battery cell 20 is a rectangular parallelepiped structure.

[0237] According to some embodiments of the present application, referring 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 the present application. Figure 4 This is an exploded view of the structure of the battery cell 20 provided in some embodiments of the present application. Figure 5 A partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application, Figure 6 Schematic diagram of the structure of the one-way valve 23 provided in some embodiments of the present application. The present application provides a battery cell 20, which includes a shell 21, an electrode assembly 22 and a one-way valve 23. The shell 21 has a wall portion 211, the electrode assembly 22 is accommodated in the shell 21, and the one-way valve 23 is arranged on the wall portion 211. The one-way valve 23 is used to discharge the gas inside the shell 21.

[0238] The housing 21 can also be used to contain electrolyte, such as electrolyte. The housing 21 can be in various structural forms, such as a cylinder or a cuboid. Similarly, the housing 21 can be made of various materials, such as copper, iron, aluminum, steel or aluminum alloy.

[0239] In some embodiments, the housing 21 may include a shell 212 and an end cap 213, wherein a accommodating cavity is formed inside the shell 212, and the accommodating cavity is used to accommodate the electrode assembly 22, and the accommodating cavity has an opening 2121, that is, the shell 212 is a hollow structure with an opening 2121 at one end, and the end cap 213 covers the opening 2121 of the shell 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte.

[0240] It should be noted that the wall portion 211 for mounting the one-way valve 23 may be an end cover 213 of the housing 21 or a wall of the shell 212 of the housing 21. Figure 3 In the embodiment, the wall portion 211 is the end cap 213. Of course, the structure of the battery cell 20 is not limited thereto, and in other embodiments, the wall portion 211 may also be a bottom wall of the housing 212 and the end cap 213 disposed opposite to each other, or a side wall of the housing 212 and the end cap 213 adjacent to and connected to each other.

[0241] When assembling the battery cell 20 , the electrode assembly 22 may be placed into the shell 212 first, and the shell 212 may be filled with electrolyte. Then, the end cap 213 may be covered on the opening 2121 of the shell 212 to complete the assembly of the battery cell 20 .

[0242] The shell 212 can be in various shapes, such as a cylinder, a cuboid, or a prism structure. The shape of the shell 212 can be determined according to the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 is a cylindrical structure, a shell 212 with a cylindrical structure can be selected; if the electrode assembly 22 is a cuboid structure, a shell 212 with a cuboid structure can be selected. Of course, the structure of the end cap 213 can also be various, such as the end cap 213 being a plate-like structure or a hollow structure with one end open. For example, in Figure 3 In the embodiment, the housing 212 is a rectangular parallelepiped structure.

[0243] Of course, it is understandable that the outer shell 21 is not limited to the above structure, and the outer shell 21 may also be other structures. For example, the outer shell 21 may include a shell body 212 and two end caps 213. The shell body 212 is a hollow structure with openings 2121 on opposite sides. One end cap 213 corresponds to an opening 2121 of the shell body 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 22 and the electrolyte. That is, the shell body 212 is formed with openings 2121 on opposite sides, and the two end caps 213 are respectively covered on the two sides of the shell body 212 to close the corresponding openings 2121.

[0244] It should be noted that the electrode assembly 22 is the component where electrochemical reactions occur in the battery cell 20, and the structure of the electrode assembly 22 can be of various types. For example, the electrode assembly 22 can be a wound structure formed by winding a positive electrode sheet, an isolation member, and a negative electrode sheet, or it can be a stacked structure formed by stacking a positive electrode sheet, an isolation member, and a negative electrode sheet.

[0245] Exemplarily, the isolation member is an isolation membrane, and the main material of the isolation membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0246] Optionally, the number of electrode assemblies 22 contained in the housing 21 may be one or more. Figure 3 In the embodiment, the housing 21 of the battery cell 20 is provided with two electrode assemblies 22, and the two electrode assemblies 22 are stacked along the thickness direction thereof, that is, the two electrode assemblies 22 are stacked along the thickness direction of the battery cell 20. Of course, in other embodiments, the number of electrode assemblies 22 accommodated in the housing 21 may also be one, three, four, five, six, seven or eight.

[0247] It should be noted that the one-way valve 23 is provided on the wall portion 211, and is used to exhaust the gas inside the housing 21, that is, the one-way valve 23 can be opened in one direction to exhaust gas, so that the gas inside the housing 21 can be discharged to the outside of the housing 21 through the one-way valve 23. Optionally, the one-way valve 23 can be provided on the wall portion 211 in various structures, such as the one-way valve 23 welded to the wall portion 211, the one-way valve 23 clamped to the wall portion 211, or the one-way valve 23 bonded to the wall portion 211. The outside of the housing 21 refers to the external environment of the battery cell 20.

[0248] For example, in Figure 5In the figure, a mounting hole 2111 is provided on the wall portion 211, and the mounting hole 2111 connects the interior of the shell 21 and the exterior of the shell 21. Part of the one-way valve 23 is assembled into the mounting hole 2111 and extends to the interior of the shell 21 along the thickness direction X of the wall portion. The one-way valve 23 is sealed and connected to the hole wall surface of the mounting hole 2111.

[0249] In some embodiments, the battery cell 20 may further include an electrode terminal 24 , which is insulated and mounted on the housing 21 , and is electrically connected to the electrode assembly 22 to output or input electrical energy of the battery cell 20 .

[0250] It should be noted that the electrode terminal 24 is insulated and mounted on the housing 21 , that is, no electrical connection is formed between the electrode terminal 24 and the housing 21 .

[0251] Among them, Figure 3 In the embodiment, the battery cell 20 includes two electrode terminals 24, and correspondingly, each electrode assembly 22 has two pole ears 221, and the polarities of the two pole ears 221 are opposite. The two electrode terminals 24 are electrically connected to the two pole ears 221 of the electrode assembly 22, respectively, so as to realize the input or output of the positive electrode and the negative electrode of the battery cell 20. It should be noted that the pole ears 221 of the electrode assembly 22 are components formed by mutually stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer, or components formed by mutually stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer. If the pole ears 221 are used to output the positive electrode of the electrode assembly 22, the pole ears 221 are components formed by mutually stacking and connecting the regions on the positive electrode sheet that are not coated with the positive electrode active material layer; if the pole ears 221 are used to output the negative electrode of the electrode assembly 22, the pole ears 221 are components formed by mutually stacking and connecting the regions on the negative electrode sheet that are not coated with the negative electrode active material layer.

[0252] Exemplarily, the electrode terminal 24 may be made of a variety of materials. For example, the electrode terminal 24 may be made of copper, iron, aluminum, steel, or aluminum alloy.

[0253] The electrode terminal 24 may be mounted on the housing 21 in various structures. Figure 3 In the embodiment, the two electrode terminals 24 are both mounted on the end cap 213 of the outer shell 21. Of course, the structure of the battery cell 20 is not limited thereto. In other embodiments, the two electrode terminals 24 may be both mounted on the shell 212 of the outer shell 21. Similarly, the two electrode terminals 24 may be one electrode terminal 24 mounted on the shell 212 of the outer shell 21 and the other electrode terminal 24 mounted on the end cap 213 of the outer shell 21.

[0254] 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 cover 213 of the housing 21, or may be disposed on the shell 212 of the housing 21, and the pressure relief mechanism 25 is used to release the pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0255] For example, in Figure 4 In the embodiment, the pressure relief mechanism 25 is arranged on the end cover 213 of the housing 21, and the pressure relief mechanism 25 can be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, a pressure relief valve or a safety valve.

[0256] By arranging a one-way valve 23 on the wall portion 211 of the outer shell 21, the one-way valve 23 can be opened in one direction and discharge the gas inside the outer shell 21 to the outside of the outer shell 21, so that when gas is generated inside the outer shell 21 during normal use of the battery cell 20, it can be discharged to the outside of the outer shell 21 through the one-way valve 23, so as to alleviate the phenomenon that the internal pressure of the battery cell 20 reaches the threshold value in advance due to the increase of the internal air pressure of the battery cell 20, so as to cause the battery cell 20 to actuate and release pressure in advance, thereby effectively improving the use stability of the battery cell 20, so as to improve the service life and use reliability of the battery cell 20.

[0257] According to some embodiments of the present application, referring to Figure 5 and Figure 6 , and please refer to Figure 7 and Figure 8 , Figure 7 Figure 8 is a structural exploded view of the one-way valve 23 provided in some embodiments of the present application, and Figure 9 is a cross-sectional view of the one-way valve 23 provided in some embodiments of the present application. The one-way valve 23 may include a valve body 231 and a valve core 232. The valve body 231 is arranged 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 arranged on the valve body 231. The air inlet 2312 is used to connect the installation cavity 2311 with the inside of the housing 21, and the air outlet 2313 is used to connect the installation cavity 2311 with the outside of the housing 21. The valve core 232 is arranged in the installation cavity 2311, and the valve core 232 is used to block the air inlet 2312, and is used to open the air inlet 2312 under the action of the gas inside the housing 21.

[0258] Among them, the air inlet 2312 is used to connect the installation cavity 2311 and the interior of the shell 21, that is, the gas inside the shell 21 can enter the installation cavity 2311 through the air inlet 2312. Similarly, the air outlet 2313 is used to connect the installation cavity 2311 and the outside of the shell 21, that is, the gas from the inside of the shell 21 entering the installation cavity 2311 can be discharged to the outside of the shell 21 through the air outlet 2313.

[0259] The valve core 232 is used to block the air inlet 2312, and is used to open the air inlet 2312 under the action of the gas inside the shell 21. That is to say, when the valve core 232 can block the air inlet 2312, the gas outside the shell 21 cannot enter the inside of the shell 21, and the gas inside the shell 21 cannot be discharged from the outside of the shell 21. When the pressure of the gas inside the shell 21 reaches a certain threshold, the gas inside the shell 21 can push the valve core 232 to open the air inlet 2312, so that the gas inside the shell 21 can enter the installation cavity 2311 and then be discharged from the outside of the shell 21 through the air outlet 2313.

[0260] Optionally, the structure of the valve core 232 can be various, for example, Figure 5 and Figure 7 In the embodiment, the valve core 232 may include an elastic member 2321 and a blocking member 2322. Both the elastic member 2321 and the blocking member 2322 are arranged in the installation cavity 2311. The elastic member 2321 is configured to provide elastic force to the blocking member 2322 so that the blocking member 2322 can block the air inlet 2312. When the force of the gas inside the housing 21 acting on the blocking member 2322 is greater than the elastic force of the elastic member 2321, the gas inside the housing 21 can overcome the elastic member 2321. 1 and push the blocking member 2322 to open the air inlet 2312, so as to allow the gas inside the housing 21 to enter the installation cavity 2311 and then be discharged to the outside of the housing 21 through the air outlet 2313. On the contrary, after the gas inside the housing 21 is discharged and the force of the gas inside the housing 21 on the blocking member 2322 is less than the elastic force of the elastic member 2321, the elastic member 2321 can drive the blocking member 2322 to reset to block the air inlet 2312. Of course, in other embodiments, the valve core 232 can also be an elastic component as a whole, such as elastic rubber.

[0261] The one-way valve 23 is provided with a valve body 231 and a valve core 232. The valve body 231 is arranged on the wall 211, and the valve body 231 is provided with an air inlet 2312 connecting the installation cavity 2311 and the inside of the shell 21, and an air outlet 2313 connecting the installation cavity 2311 and the outside of the shell 21. By setting the valve core 232 in the installation cavity 2311, the valve core 232 can block the air inlet 2312, and when the pressure inside the shell 21 rises, the gas inside the 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, so that the one-way valve 23 can discharge the gas inside the shell 21 to the outside of the shell 21.

[0262] According to some embodiments of this application, see 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 the valve body 2314 is provided with an air inlet 2312. Along the thickness direction X of the wall portion, the valve cover 2315 is disposed at one end of the valve body 2314 away from the electrode assembly 22, and the valve cover 2315 and the valve body 2314 are enclosed together to form a mounting cavity 2311.

[0263] The valve body 2314 is disposed on the wall portion 211, and the valve body 2314 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 installation hole 2111, and the valve body 2314 can be welded to the wall portion 211, or can be bonded to the wall portion 211 by a sealant.

[0264] The valve body 2314 is provided with an air inlet 2312. Exemplarily, 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 part of the valve body 2314 extending into the outer shell 21.

[0265] Optionally, the valve cover 2315 is disposed at the end of the valve body 2314 away from the electrode assembly 22. The valve cover 2315 may be connected to the end of the valve body 2314 away from the electrode assembly 22, or the valve cover 2315 may be connected to the wall 211 and the valve cover 2315 and the valve body 2314 are arranged along the thickness direction X of the wall. Figure 5 and Figure 8 In the embodiment, the valve cover 2315 is connected to one end of the valve body 2314 away from the electrode assembly 22 , so that the valve cover 2315 and the interior of the valve body 2314 are jointly enclosed to form a mounting cavity 2311 for accommodating the valve core 232 .

[0266] It should be noted that, in the embodiment where the valve cover 2315 is connected to the end of the valve body 2314 facing away from the electrode assembly 22, the gas outlet 2313 can be directly opened on the valve cover 2315, that is, the gas outlet 2313 is a channel arranged on the valve cover 2315, or it can be arranged between the valve cover 2315 and the valve body 2314, that is, the gas outlet 2313 is a gap formed between the valve cover 2315 and the valve body 2314.

[0267] For example, the material of the valve body 2314 can be a metal material, such as copper, iron, aluminum, steel or aluminum alloy, etc. Similarly, the material of the valve cover 2315 can also be a metal material, such as copper, iron, aluminum, steel or aluminum alloy, etc. The valve body 2314 and the valve cover 2315 can be the same material or different materials.

[0268] The valve body 231 of the one-way valve 23 is provided with a valve main body 2314 and a valve cover 2315. The valve cover 2315 is connected to the end of the valve main body 2314 away from the electrode assembly 22 in the thickness direction X of the wall, so that the valve cover 2315 and the valve main body 2314 jointly define an installation cavity 2311 for accommodating the valve core 232. The one-way valve 23 with this structure is configured with the valve body 231 as two parts, thereby facilitating the assembly of the valve core 232 into the installation cavity 2311, which helps to reduce the difficulty of assembling the one-way valve 23.

[0269] 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 a first through hole provided on the valve cover 2315 .

[0270] The air outlet 2313 penetrates through both sides of the valve cover 2315 along the thickness direction X of the wall, so that the air outlet 2313 is communicated with the installation cavity 2311 .

[0271] Optionally, the air outlet 2313 provided on the valve cover 2315 may be one or more. Figure 6 In the embodiment, three air outlets 2313 are provided on the valve cover 2315. Of course, in other embodiments, the number of air outlets 2313 provided on the valve cover 2315 may be two, four, five or six.

[0272] As an example, there are multiple air outlets 2313 disposed on the valve cover 2315 , and the multiple air outlets 2313 are arranged at equal intervals.

[0273] As an example, a plurality of gas outlets 2313 are arranged at equal intervals around the center of the valve cover 2315, which allows the gas to flow out more smoothly.

[0274] A first through hole is provided on the valve cover 2315 of the valve body 231 to form an air outlet 2313 of the valve body 231, so that the installation cavity 2311 of the valve body 231 can be connected to the outside of the shell 21 through the first through hole provided on the valve cover 2315. The valve body 231 with such a 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 conducive to reducing the difficulty of assembling the valve cover 2315 and the valve body 2314.

[0275] Of course, 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 structure of the gas outlet 2313 is not limited thereto. Fig. 9 , Fig. 9The schematic diagram of the structure of the one-way valve 23 provided in some embodiments of the present application is as follows: the valve cover 2315 is connected to the valve body 2314 , and the gas outlet 2313 is a first exhaust gap formed between the valve cover 2315 and the valve body 2314 .

[0276] Among them, the outer circumferential surface of the valve cover 2315 is convexly provided with a plurality of protrusions 2315a, and the plurality of protrusions 2315a are arranged at intervals along the circumference of the valve cover 2315. The protrusions 2315a are interference fit with the valve body 2314, and a first exhaust gap is formed between the area of ​​the outer circumferential surface of the valve cover 2315 where no protrusions 2315a are provided and the valve body 2314, that is, in the circumferential direction of the valve cover 2315, the air outlet 2313 is formed between two adjacent protrusions 2315a.

[0277] By setting a first exhaust gap between the valve cover 2315 and the valve body 2314 to form the air outlet 2313 of the valve body 231, the installation cavity 2311 of the valve body 231 can be connected to the outside of the 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.

[0278] According to some embodiments of the present application, see Figure 6 , Figure 7 and Figure 8 As shown, the valve cover 2315 is connected to the valve body 2314. A sink 2314a is provided at one end of the valve body 2314 away from the electrode assembly 22. At least a portion of the valve cover 2315 is accommodated in the sink 2314a.

[0279] The installation cavity 2311 penetrates the bottom surface of the groove 2314a, and the valve cover 2315 is assembled in the groove 2314a and abuts against the bottom surface of the groove 2314a, so that the valve cover 2315 and the valve body 2314 are enclosed to form the installation cavity 2311.

[0280] At least part of the valve cover 2315 is accommodated in the groove 2314a, that is, the valve cover 2315 may be located in the groove 2314a as a whole or partially, that is, in the thickness direction X of the wall, the valve cover 2315 may extend out of the groove 2314a or may not extend out of the groove 2314a.

[0281] By providing a recess 2314a on the end of the valve body 2314 facing away from the electrode assembly 22, and at least partially accommodating the valve cover 2315 in the recess 2314a, the one-way valve 23 adopting such a structure can, on the one hand, save the space occupied by the valve body 231 in the thickness direction X of the wall, and on the other hand, improve the structural stability of the valve cover 2315 assembled on the valve body 2314, and can play a certain protective role on the valve cover 2315, so as to reduce the wear or damage of the valve cover 2315.

[0282] 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. In other words, the valve cover 2315 is entirely located in the sink 2314a.

[0283] Illustratively, in the thickness direction X of the wall, the surface of the valve cover 2315 facing away from the electrode assembly 22 is flush with the end surface of the valve body 2314 facing away from the electrode assembly 22 .

[0284] By setting the valve cover 2315 in the thickness direction X of the wall so as not to extend beyond the end of the valve body 2314 away from the electrode assembly 22, the valve cover 2315 is located as a whole in the recess 2314a, thereby further saving the space occupied by the valve body 231 in the thickness direction X of the wall, and further improving the protection of the valve cover 2315, so as to reduce the wear or damage of the valve cover 2315.

[0285] 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 facing away from the electrode assembly 22 , and the valve body 2314 does not extend beyond the first surface 2112 .

[0286] Among them, 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 211 away from the electrode assembly 22 in the thickness direction X of the wall. In the embodiment where the valve cover 2315 is connected to the valve body 2314 and is located as a whole in the groove 2314a, the one-way valve 23 does not protrude from the side of the wall 211 away from the electrode assembly 22 in the thickness direction X of the wall.

[0287] By setting the valve body 2314 of the valve body 231 in the thickness direction X of the wall so as not to exceed the first surface 2112 of the wall 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. On the one hand, it can save the space occupied by the battery cell 20 in the thickness direction X of the wall. On the other hand, it can reduce the wear or collision between the valve body 231 and the external environment, which is beneficial to improve the protection of the valve body 231 and increase the service life of the one-way valve 23.

[0288] Of course, the assembly structure of the one-way valve 23 and the wall portion 211 is not limited thereto. In some embodiments, the battery cell 20 may also be other structures. For example, Fig.10 , Fig.10This is a partial cross-sectional view of a battery cell 20 provided in some other embodiments of the present application, in which the valve cover 2315 is connected to the wall portion 211 , and the air outlet 2313 is a second exhaust gap formed between the valve cover 2315 and the wall portion 211 .

[0289] The valve cover 2315 is located at one end of the valve body 2314 away from the electrode assembly 22 in the thickness direction X of the wall, and the valve cover 2315 is connected to the wall 211 , so that the valve cover 2315 and the valve body 2314 jointly define an installation cavity 2311 for accommodating the valve core 232 .

[0290] For example, in Fig.10 In the figure, 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, and the surface of the valve cover 2315 on the side facing away from the electrode assembly 22 in the thickness direction X of the wall portion is flush with the first surface 2112, and a second exhaust gap is formed between the valve cover 2315 and the groove side of the mounting groove 2113.

[0291] Optionally, the valve cover 2315 may be connected to the wall portion 211 in various structures, for example, the valve cover 2315 may be connected to the groove side of the installation groove 2113 by welding, or the valve cover 2315 may be interference fit with the groove side of the installation groove 2113. Similarly, the air outlet 2313 is a second exhaust gap formed between the valve cover 2315 and the wall portion 211, and the structure of the second exhaust gap may also be various, for example, it may be a first groove provided on the outer peripheral surface of the valve cover 2315, and the second exhaust gap is formed between the groove bottom surface of the first groove and the groove side of the installation groove 2113.

[0292] By connecting the valve cover 2315 to the wall portion 211, and the air outlet 2313 of the valve body 231 is a second exhaust gap arranged between the valve cover 2315 and the wall portion 211, the battery cell 20 adopting this structure can, on the one hand, expand the space size of the installation cavity 2311 formed between the valve cover 2315 and the valve body 2314 to improve the exhaust efficiency and exhaust smoothness of the one-way valve 23, and 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 is beneficial to reduce the phenomenon that the air outlet 2313 is blocked by other components of the battery cell 20.

[0293] According to some embodiments of the present application, see Figure 5As shown, the valve body 2314 of the valve body 231 and the wall portion 211 are separately arranged structures, and the wall portion 211 is provided with a mounting hole 2111 connecting the inside of the shell 21 and the outside of the shell 21. The valve body 2314 of the valve body 231 is inserted into the mounting hole 2111 and is sealed and connected to the hole wall surface of the mounting hole 2111. Of course, in some embodiments, the battery cell 20 can also be other structures, for example, the valve body 2314 and the wall portion 211 are integrally formed. In other words, the valve body 2314 of the valve body 231 and the wall portion 211 are an integral structure, which is made by an integral molding process, such as stamping or casting. By arranging the valve body 2314 of the valve body 231 and the wall portion 211 as an integrally formed structure, it is beneficial to enhance the structural stability and structural strength of the valve body 2314 arranged on the wall portion 211.

[0294] According to some embodiments of the present application, see Figure 5 , Figure 7 and Figure 8 As shown, the valve core 232 may include an elastic member 2321 and a blocking member 2322. The elastic member 2321 is disposed in the installation cavity 2311, and the blocking member 2322 is movably disposed in the installation cavity 2311. The blocking member 2322 is used to block the air inlet 2312 under the action of the elastic member 2321, and is used to open the air inlet 2312 under the action of the gas inside the housing 21.

[0295] Among them, the blocking piece 2322 is movably arranged in the installation cavity 2311, that is, the blocking piece 2322 can move in the installation cavity 2311, so that the blocking piece 2322 can block the air inlet 2312 when it moves closer to the air inlet 2312, conversely, when the blocking piece 2322 moves away from the air inlet 2312, it can open the air inlet 2312.

[0296] Exemplarily, the air inlet 2312 is disposed at one end of the valve body 2314 in the thickness direction X of the wall portion close to the electrode assembly 22, that is, the air inlet 2312 passes through the bottom surface of the installation cavity 2311, and correspondingly, the blocking member 2322 is movably disposed in the installation cavity 2311 along the thickness direction X of the wall portion, so that the blocking member 2322 can block the air inlet 2312 when it abuts against the bottom surface of the installation cavity 2311. Of course, in other embodiments, the air inlet 2312 can also be disposed on one side of the valve body 2314 in the radial direction of the valve body 2314, and correspondingly, the blocking member 2322 is movably disposed in the installation cavity 2311 along the radial direction of the valve body 2314.

[0297] The blocking member 2322 is used to block the air inlet 2312 under the action of the elastic member 2321, and is used to open the air inlet 2312 under the action of the gas inside the shell 21. That is to say, the elastic member 2321 can provide elastic force for the blocking member 2322, so that the blocking member 2322 can abut against the bottom surface of the installation cavity 2311 to block the air inlet 2312. Conversely, when the force of the gas inside the shell 21 acting on the blocking member 2322 is greater than the elastic force of the elastic member 2321, the gas inside the shell 21 can overcome the elastic force of the elastic member 2321 and push the blocking member 2322 to separate from the bottom surface of the installation cavity 2311, so as to realize the opening of the air inlet 2312 by the blocking member 2322, so that the gas inside the shell 21 can enter the installation cavity 2311 through the air inlet 2312 and then be discharged through the air outlet 2313.

[0298] Optionally, the elastic member 2321 is an elastic member, and its structure can be various, such as a spring, a spring or elastic rubber.

[0299] The valve core 232 of the one-way valve 23 is provided with an elastic member 2321 and a sealing member 2322, and the elastic member 2321 and the sealing member 2322 are both arranged in the installation cavity 2311, so that the elastic member 2321 can apply elastic force to the sealing member 2322, so that the sealing member 2322 can block the air inlet 2312 to prevent the gas outside the shell 21 from entering the interior of the shell 21, and when the pressure inside the shell 21 rises, the gas inside the shell 21 can act on the sealing member 2322 and overcome the elastic force of the elastic member 2321, so that the sealing member 2322 can open the air inlet 2312, so that the gas inside the shell 21 can be discharged through the one-way valve 23, so that the one-way valve 23 can discharge the gas inside the shell 21 to the outside of the shell 21, and can prevent the gas outside the shell 21 from entering the interior of the shell 21.

[0300] In some embodiments, see Figure 7 and Figure 8 As shown, the elastic member 2321 is a spring. Of course, in other embodiments, the elastic member 2321 can also be a spring or elastic rubber.

[0301] It should be noted that the projection of the air outlet 2313 in 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 in the thickness direction X of the wall can be located inside the spring or around the outside of the spring. Of course, in some embodiments, they can be partially located inside the spring and partially located outside the spring.

[0302] Among them, the spring is arranged along the thickness direction X of the wall, and the two ends of the spring are respectively abutted against the sealing piece 2322 and the valve cover 2315, and the spring is in a compressed state and is located between the valve cover 2315 and the sealing piece 2322, so that the spring can apply elastic force to the sealing piece 2322, so that the sealing piece 2322 can abut against the bottom surface of the installation cavity 2311 to seal the air inlet 2312.

[0303] Optionally, the compression margin of the elastic member 2321 in a compressed state between the valve cover 2315 and the blocking member 2322 is greater than or equal to 0.5 mm, so that the elastic member 2321 has a sufficient compression margin for the blocking member 2322 to move along the thickness direction X of the wall portion, so that the blocking member 2322 can open the air inlet 2312. If the elastic member 2321 is a spring, then in the thickness direction X of the wall portion, the sum of the gaps between the coils of the spring is greater than or equal to 0.5 mm.

[0304] Using a spring as the elastic member 2321 arranged in the installation cavity 2311, on the one hand, facilitates the assembly of the elastic member 2321 and helps to reduce the difficulty of assembling the elastic member 2321 in the installation cavity 2311, and on the other hand, it can ensure that the direction in which the elastic force applied by the elastic member 2321 to the blocking member 2322 is relatively stable.

[0305] In some embodiments, the elastic member 2321 is made of steel, iron or aluminum. The elastic member 2321 made of steel, iron or aluminum has good toughness and can alleviate the elastic failure of the elastic member 2321, which is conducive to improving the service life of the elastic member 2321.

[0306] According to some embodiments of the present 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 blocking member 2322 are spaced apart, both ends of the elastic member 2321 are respectively against the valve cover 2315 and the blocking member 2322 , and the air inlet 2312 is arranged on the bottom surface of the installation cavity 2311 .

[0307] Among them, along the thickness direction X of the wall portion, the valve cover 2315 and the cavity bottom surface of the installation cavity 2311 are arranged facing each other, and the elastic member 2321 is arranged between the valve cover 2315 and the blocking member 2322, so that the blocking member 2322 can abut against the cavity bottom surface of the installation cavity 2311 under the action of the elastic member 2321, thereby blocking the air inlet 2312. Of course, if the air inlet 2312 is arranged on the cavity wall surface of the installation cavity 2311, that is, the air inlet 2312 is arranged on one side in the radial direction of the valve body 2314, then the blocking member 2322 and the elastic member 2321 are arranged along the radial direction of the valve body 2314, and the two ends of the elastic member 2321 abut against the blocking member 2322 and the cavity wall surface of the installation cavity 2311 respectively.

[0308] Optionally, the blocking member 2322 may have various structures. Figure 7 and Figure 8 In the figure, the blocking member 2322 includes a clamping portion 2322a and a sealing portion 2322b, the rigidity of the clamping portion 2322a is greater than that of the sealing portion 2322b, along the thickness direction X of the wall, the sealing portion 2322b is connected to the side of the clamping portion 2322a away from the valve cover 2315, the sealing portion 2322b is used to block the air inlet 2312, the elastic member 2321 is arranged between the valve cover 2315 and the clamping portion 2322a, the clamping portion 2322a can be pressed against the sealing portion 2322b under the elastic force of the elastic member 2321, so that the sealing portion 2322b is pressed against the cavity wall of the installation cavity 2311, thereby blocking the air inlet 2312 through the sealing portion 2322b. Of course, in other embodiments, the blocking member 2322 may be a sealing component as a whole, such as a rubber pad or a silicone pad, that is, the blocking member 2322 only includes the sealing portion 2322b, and the two ends of the elastic member 2321 respectively abut against the valve cover 2315 and the sealing portion 2322b.

[0309] By arranging the valve cover 2315 and the blocking member 2322 to be arranged in a spaced relationship 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 blocking member 2322, so that the blocking member 2322 can block the air inlet 2312 arranged on the bottom surface of the installation cavity 2311 along the thickness direction X of the wall under the action of the elastic member 2321. That is to say, the air inlet 2312 is arranged at one end of the valve body 2314 facing the electrode assembly 22 in the thickness direction X of the wall, and the blocking member 2322 can move along the thickness direction X of the wall and block the air inlet 2312 under the action of the elastic member 2321. The one-way valve 23 adopting this structure makes it easy for the elastic member 2321 to apply elastic force to the blocking member 2322, so that the blocking member 2322 blocks the air inlet 2312, and can reduce the difficulty of assembling the elastic member 2321.

[0310] According to some embodiments of the present application, see Figure 7 and Figure 8 As shown, a first guide column 2315 b is protrudingly provided on one side of the valve cover 2315 facing the blocking member 2322 , and a portion of the elastic member 2321 is sleeved on the outer side of the first guide column 2315 b .

[0311] Among them, the elastic member 2321 is a spring, part of which is sleeved on the outside of the first guide column 2315b, and one end of the spring away from the blocking member 2322 abuts against the surface of the valve cover 2315 on which the first guide column 2315b is protruding, that is, the first guide column 2315b is inserted into the spring.

[0312] Illustratively, the central axis of the first guide column 2315b coincides with the central axis of the mounting hole 2111, and the central axis of the elastic member 2321 coincides with the central axis of the first guide column 2315b.

[0313] By protruding a first guide column 2315b on the side of the valve cover 2315 facing the blocking member 2322, and partially sleeved on the outer side of the first guide column 2315b, the one-way valve 23 with such a structure can, on the one hand, play a certain positioning role for the elastic member 2321 through the first guide column 2315b, so as to facilitate the assembly of the elastic member 2321, which is beneficial to reduce the difficulty of assembling the elastic member 2321; on the other hand, the first guide column 2315b can play a certain guiding role when the elastic member 2321 is compressed along the thickness direction X of the wall, so as to reduce the radial deformation of the elastic member 2321 during the compression process, so that the elastic member 2321 can be stably compressed along the thickness direction X of the wall, which is beneficial to improve the reliability of the elastic member 2321, and further reduce the risk of the blocking member 2322 accidentally opening the air inlet 2312.

[0314] It should be noted that in the embodiment where the valve cover 2315 is provided with a first guide column 2315b, and the gas outlet 2313 is a first through hole provided on the valve cover 2315, the structure of the valve cover 2315 can be various, for example, 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 a first through hole provided on the valve cover 2315. Along the radial direction of the first guide column 2315b, the air outlet 2313 and the first guide column 2315b are arranged at intervals.

[0315] The air outlet 2313 and the first guide column 2315b are arranged at intervals, that is, the air outlet 2313 is located outside the first guide column 2315b. Figure 7 and Figure 8 In the embodiment, three air outlets 2313 are arranged, and the three air outlets 2313 are arranged at intervals along the circumference of the first guide column 2315b. The three air outlets 2313 are arranged around the outer side of the first guide column 2315b, and the three air outlets 2313 are arranged around the central axis of the mounting hole 2111. Of course, in other embodiments, the number of air outlets 2313 may be two, four, five, etc.

[0316] In some embodiments, the valve cover 2315 can also be other structures, for example, Fig.11 and Fig.12 As shown, Fig.11 This is a schematic diagram of the structure of the one-way valve 23 provided in some embodiments of the present application. Fig.12The cross-sectional view of the one-way valve 23 provided in some other embodiments of the present application. Along the thickness direction X of the wall portion, the air outlet 2313 penetrates the first guide column 2315b, that is, the air outlet 2313 is arranged at the position where the valve cover 2315 has the first guide column 2315b, that is, the air outlet 2313 extends along the thickness direction X of the wall portion into the first guide column 2315b and penetrates the first guide column 2315b.

[0317] For example, in Fig.11 and Fig.12 In the embodiment, 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 column 2315b.

[0318] By setting the gas outlet 2313 as the first through hole opened on the valve cover 2315, and the first through hole penetrates the first guide column 2315b along the thickness direction X of the wall, the gas outlet 2313 is located on the inner side of the elastic member 2321, which is conducive to reducing the interference effect of the gas outlet 2313 on the connection between the valve cover 2315 and the valve body 2314. Similarly, by setting the gas outlet 2313 as the first through hole opened on the valve cover 2315, and the gas outlet 2313 is located on the outer side of the first guide column 2315b, it is conducive to gas discharge, so as to reduce the phenomenon that the gas outlet 2313 is blocked by the blocking member 2322.

[0319] According to some embodiments of the present application, see Figure 8 As shown, the diameter of the first guide column 2315b is D 1 , the inner diameter of the elastic member 2321 is D 2 , meet, 0mm<D 2 -D 1 ≤5mm.

[0320] The elastic member 2321 is a spring, and the inner diameter D of the elastic member 2321 is 2 It is the diameter of the cavity formed on the inner side of the spring.

[0321] 0mm<D 2 -D 1 ≤5mm, that is, when the first guide column 2315b and the elastic member 2321 are coaxially arranged, the size of the gap between the first guide column 2315b and the elastic member 2321 is greater than 0mm and less than or equal to 5mm.

[0322] Exemplarily, the difference between the inner diameter of the elastic member 2321 and the diameter of the first guide column 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.

[0323] By setting the difference between the inner diameter of the elastic member 2321 and the diameter of the first guide column 2315b to be greater than 0 mm and less than or equal to 5 mm, on the one hand, the phenomenon that the elastic member 2321 is not convenient to be assembled on the first guide column 2315b due to the difference between the inner diameter of the elastic member 2321 and the diameter of the first guide column 2315b being less than or equal to 0 can be alleviated, so as to reduce the scratching phenomenon when the elastic member 2321 is sleeved on the first guide column 2315b. On the other hand, the phenomenon that the gap between the elastic member 2321 and the first guide column 2315b is too large due to the difference between the inner diameter of the elastic member 2321 and the diameter of the first guide column 2315b is too large can be alleviated, so as to reduce the radial movement or radial deformation of the elastic member 2321, thereby improving the balance of the elastic force of the elastic member 2321 acting on the blocking member 2322, so as to reduce the risk of the blocking member 2322 accidentally opening the air inlet 2312.

[0324] According to some embodiments of the present application, referring to Fig.13 , Fig.13 The sectional view of the one-way valve 23 provided in some other embodiments of the present application. A first limiting groove 2315c is provided on the side of the valve cover 2315 facing the blocking member 2322, and one end of the elastic member 2321 away from the blocking member 2322 is inserted into the first limiting groove 2315c.

[0325] Among them, a first limiting groove 2315c is provided on the side of the valve cover 2315 facing the blocking member 2322, that is, the first limiting groove 2315c is provided on the surface of the valve cover 2315 facing the blocking member 2322 in the thickness direction X of the wall. In the embodiment in which a first guide column 2315b is protrudingly provided on the side of the valve cover 2315 facing the blocking member 2322, the first limiting groove 2315c is provided on the surface of the valve cover 2315 on which the first guide column 2315b is protruding.

[0326] One end of the elastic member 2321 away from the blocking member 2322 is inserted into the first limiting groove 2315c, that is, one end of the elastic member 2321 away from the blocking member 2322 abuts against the bottom surface of the first limiting groove 2315c.

[0327] Exemplarily, the elastic member 2321 is a spring, and correspondingly, the first limiting groove 2315c is an annular groove structure. In an embodiment in which a first guide column 2315b is protrudingly provided on the side of the valve cover 2315 facing the blocking member 2322, the first limiting groove 2315c is arranged around the outer side of the first guide column 2315b.

[0328] A first limiting groove 2315c for inserting the elastic member 2321 is also provided on the side of the valve cover 2315 facing the sealing member 2322, thereby limiting the end of the elastic member 2321 that abuts against the valve cover 2315, thereby reducing the relative radial slip between the elastic member 2321 and the valve cover 2315, thereby improving the balance of the elastic force of the elastic member 2321 on the sealing member 2322, which is beneficial to improving the reliability of the elastic member 2321.

[0329] According to some embodiments of the present application, one end of the elastic member 2321 away from the blocking member 2322 is fixedly connected to the valve cover 2315 .

[0330] There are various structures for fixing the elastic member 2321 and the valve cover 2315, such as welding or bonding.

[0331] It should be noted that, in an embodiment in which a first limiting groove 2315c is provided on the side of the valve cover 2315 facing the blocking member 2322, and one end of the elastic member 2321 away from the blocking member 2322 is inserted into the first limiting groove 2315c, then the end of the elastic member 2321 away from the blocking member 2322 is fixedly connected to the bottom surface of the first limiting groove 2315c; in an embodiment in which the first limiting groove 2315c is not provided on the side of the valve cover 2315 facing the blocking member 2322, then the end of the elastic member 2321 away from the blocking member 2322 is fixedly connected to the surface of the valve cover 2315 that abuts against each other.

[0332] By fixedly connecting one end of the elastic member 2321 away from the sealing member 2322 to the valve cover 2315, so that the end of the elastic member 2321 resting on the valve cover 2315 and the valve cover 2315 are fixedly connected to each other, the stability of the elastic member 2321 resting on the valve cover 2315 can be improved, so as to further reduce the relative slippage between the elastic member 2321 and the valve cover 2315, and further improve the balance of the elastic force of the elastic member 2321 on the sealing member 2322.

[0333] According to some embodiments of the present application, see Figure 5 , Figure 7 and Figure 8 As shown, a second guide column 2322c is protrudingly provided on one side of the blocking member 2322 facing the valve cover 2315, and a portion of the elastic member 2321 is sleeved on the outer side of the second guide column 2322c.

[0334] Among them, the elastic member 2321 is a spring, part of which is sleeved on the outside of the second guide column 2322c, and one end of the spring away from the valve cover 2315 abuts against the surface of the blocking member 2322 where the second guide column 2322c is protruding, that is, the second guide column 2322c is inserted into the spring.

[0335] Illustratively, the central axis of the second guide column 2322c coincides with the central axis of the mounting hole 2111, and the central axis of the elastic member 2321 coincides with the central axis of the second guide column 2322c.

[0336] For example, in an embodiment where the blocking member 2322 includes a pressing portion 2322a and a sealing portion 2322b, see Figure 7 and Figure 8 As shown, the second guide post 2322c is protruded on the surface of the pressing portion 2322a facing the valve cover 2315.

[0337] By protruding a second guide column 2322c on the side of the sealing member 2322 facing the valve cover 2315, and partially sleeved on the outer side of the second guide column 2322c, the one-way valve 23 with this structure can, on the one hand, play a certain positioning role for the elastic member 2321 through the second guide column 2322c, so as to facilitate the assembly of the elastic member 2321, which is beneficial to reducing the difficulty of assembling the elastic member 2321; on the other hand, the second guide column 2322c can play a certain guiding role when the elastic member 2321 is compressed along the thickness direction X of the wall, so as to reduce the radial deformation of the elastic member 2321 during the compression process, so that the elastic member 2321 can be stably compressed along the thickness direction X of the wall, which is beneficial to improve the reliability of the elastic member 2321, and further reduce the risk of the sealing member 2322 accidentally opening the air inlet 2312.

[0338] According to some embodiments of the present application, see Figure 8 As shown, the diameter of the second guide column 2322c is D 3 , the inner diameter of the elastic member 2321 is D 2 , meet, 0mm<D 3 -D 1 ≤5mm.

[0339] The elastic member 2321 is a spring, and the inner diameter D of the elastic member 2321 is 2 It is the diameter of the cavity formed on the inner side of the spring.

[0340] 0mm<D 3 -D 1 ≤5mm, that is, when the second guide post 2322c and the elastic member 2321 are coaxially arranged, the size of the gap between the second guide post 2322c and the elastic member 2321 is greater than 0mm and less than or equal to 5mm.

[0341] Exemplarily, the difference between the inner diameter of the elastic member 2321 and the diameter of the second guide column 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.

[0342] By setting the difference between the inner diameter of the elastic member 2321 and the diameter of the second guide column 2322c to be greater than 0 mm and less than or equal to 5 mm, on the one hand, the phenomenon that the elastic member 2321 is not convenient to be assembled on the second guide column 2322c due to the difference between the inner diameter of the elastic member 2321 and the diameter of the second guide column 2322c being less than or equal to 0 can be alleviated, so as to reduce the scratching phenomenon when the elastic member 2321 is sleeved on the second guide column 2322c. On the other hand, the phenomenon that the gap between the elastic member 2321 and the second guide column 2322c is too large due to the difference between the inner diameter of the elastic member 2321 and the diameter of the second guide column 2322c is too large can be alleviated, so as to reduce the radial movement or radial deformation of the elastic member 2321, thereby improving the balance of the elastic force of the elastic member 2321 on the blocking member 2322, so as to reduce the risk of the blocking member 2322 accidentally opening the air inlet 2312.

[0343] According to some embodiments of the present application, see Fig.13 As shown, a second limiting groove 2322d is provided on a side of the blocking member 2322 facing the valve cover 2315, and an end of the elastic member 2321 away from the valve cover 2315 is inserted into the second limiting groove 2322d.

[0344] Among them, a second limiting groove 2322d is provided on the side of the blocking member 2322 facing the valve cover 2315, that is, a second limiting groove 2322d is provided on the surface of the blocking member 2322 facing the valve cover 2315 in the thickness direction X of the wall portion. In the embodiment in which a second guide column 2322c is protrudingly provided on the side of the blocking member 2322 facing the valve cover 2315, the second limiting groove 2322d is provided on the surface of the blocking member 2322 on which the second guide column 2322c is protruding.

[0345] One end of the elastic member 2321 away from the valve cover 2315 is inserted into the second limiting groove 2322d, that is, the end of the elastic member 2321 away from the valve cover 2315 abuts against the bottom surface of the second limiting groove 2322d.

[0346] Exemplarily, the elastic member 2321 is a spring, and correspondingly, the second limiting groove 2322d is an annular groove structure. In an embodiment in which a second guide column 2322c is protruding from the side of the sealing member 2322 facing the valve cover 2315, the second limiting groove 2322d is arranged around the outer side of the second guide column 2322c.

[0347] For example, in an embodiment where the blocking member 2322 includes a pressing portion 2322a and a sealing portion 2322b, see Figure 7 and Figure 8 As shown, the second limiting groove 2322d is arranged on the surface of the pressing portion 2322a facing the valve cover 2315.

[0348] By providing a second limiting groove 2322d for the elastic member 2321 to be inserted on the side of the sealing member 2322 facing the valve cover 2315, a limiting effect can be exerted on the end of the elastic member 2321 that abuts against the sealing member 2322, so as to reduce the relative radial slip between the elastic member 2321 and the sealing member 2322, thereby improving the balance of the elastic force of the elastic member 2321 acting on the sealing member 2323, which is beneficial to improving the reliability of the elastic member 2321.

[0349] According to some embodiments of the present application, one end of the elastic member 2321 away from the valve cover 2315 is fixedly connected to the blocking member 2322 .

[0350] There are many structures for fixing the elastic member 2321 and the blocking member 2322, such as welding or bonding.

[0351] It should be noted that, in an embodiment in which 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, then 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 an embodiment in which the second limiting groove 2322d is not provided on the side of the sealing member 2322 facing the valve cover 2315, then 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 each other.

[0352] By fixedly connecting one end of the elastic member 2321 away from the valve cover 2315 with the blocking member 2322, so that the end of the elastic member 2321 resting on the blocking member 2322 and the blocking member 2322 are fixedly connected to each other, the stability of the elastic member 2321 resting on the blocking member 2322 can be improved, so as to further reduce the relative slippage between the elastic member 2321 and the blocking member 2322, and further improve the balance of the elastic force of the elastic member 2321 on the blocking member 2323.

[0353] According to some embodiments of the present application, see Figure 7 and Figure 8 As shown, the blocking member 2322 is spaced apart from the side surface of the installation cavity 2311 .

[0354] The blocking piece 2322 is spaced apart from the side surface of the installation cavity 2311 , that is, there is a gap between the blocking piece 2322 and the side surface of the installation cavity 2311 , that is, the blocking piece 2322 does not abut against the side surface of the installation cavity 2311 .

[0355] By setting the blocking piece 2322 and the side surface of the installation cavity 2311 at a distance, the scraping between the blocking piece 2322 and the side surface of the installation cavity 2311 can be reduced when the blocking piece 2322 opens or blocks the air inlet 2312 along the thickness direction X of the wall, thereby reducing the blocking piece 2322 from getting stuck or moving unsmoothly, which is beneficial to improving the reliability of the one-way valve 23.

[0356] Of course, the structure of the one-way valve 23 is not limited thereto. For example, in some embodiments, Fig.14 and Fig.15 , Fig.14 A cross-sectional view of a one-way valve 23 provided in yet another embodiment of the present application, Fig.15 The structural schematic diagram of the blocking member 2322 of the one-way valve 23 provided in some embodiments of the present application. The outer peripheral surface of the blocking member 2322 is provided with a plurality of limiting protrusions 2322e, which are arranged at intervals along the circumference of the blocking member 2322, and the limiting protrusions 2322e cooperate with the side guides of the installation cavity 2311.

[0357] Among them, the limiting protrusion 2322e cooperates with the cavity side guide of the installation cavity 2311, that is, the limiting protrusion 2322e is used to cooperate with the cavity wall surface of the installation cavity 2311 when the blocking member 2322 moves along the thickness direction X of the wall portion to play a guiding and limiting role.

[0358] For example, in Fig.14 In the embodiment, the protrusion 2322e is used to abut against the cavity wall surface of the installation cavity 2311 when the blocking member 2322 moves along the thickness direction X of the wall portion, so as to play a guiding and limiting role. Of course, in other embodiments, the one-way valve 23 can also be other structures. For example, the cavity side surface of the installation cavity 2311 is provided with 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 in the guide groove along the thickness direction X when the blocking member 2322 opens the air inlet 2312, so as to play a guiding and limiting role. A plurality of guide grooves extending along the thickness direction X of the wall portion can be provided, and the plurality of guide grooves are respectively matched with the plurality of limiting protrusions 2322e.

[0359] For example, in an embodiment where the blocking member 2322 includes a pressing portion 2322a and a sealing portion 2322b, see Figure 7 and Figure 8 As shown, the limiting protrusion 2322e is protruded on the outer peripheral surface of the pressing portion 2322a.

[0360] Optionally, the limiting protrusion 2322e may have a variety of shapes, such as a semicircular, triangular, trapezoidal or rectangular structure. For example, Fig.15 In the figure, the limiting protrusion 2322e is in the shape of a semicircle.

[0361] By providing a plurality of spaced-apart limiting protrusions 2322e on the outer peripheral surface of the blocking piece 2322, and the limiting protrusions 2322e cooperate with the side surfaces of the mounting cavity 2311 for guiding, when the blocking piece 2322 moves along the thickness direction X of the wall, the limiting protrusions 2322e cooperate with the side surfaces of the mounting cavity 2311 for guiding and limiting, so as to improve the stability of the blocking piece 2322 moving along the thickness direction X of the wall.

[0362] According to some embodiments of the present application, see Figure 7 and Figure 8 As shown, the blocking member 2322 may include a clamping portion 2322a and a sealing portion 2322b. Along the thickness direction X of the wall portion, two ends of the elastic member 2321 respectively abut against the valve cover 2315 and the clamping portion 2322a. The sealing portion 2322b is connected to the side of the clamping portion 2322a away from the valve cover 2315. The sealing portion 2322b is used to block the air inlet 2312.

[0363] Among them, the two ends of the elastic member 2321 respectively abut against the valve cover 2315 and the clamping portion 2322a, and the sealing portion 2322b is connected to the side of the clamping portion 2322a away from the valve cover 2315. That is to say, the elastic member 2321 is arranged between the valve cover 2315 and the clamping portion 2322a along the thickness direction X of the wall portion, so that the elastic member 2321 can provide an elastic force for the clamping portion 2322a, so that the clamping portion 2322a can be pressed on the sealing portion 2322b, thereby blocking the air inlet 2312 through the sealing portion 2322b.

[0364] Optionally, the rigidity of the pressing portion 2322a is greater than that of the sealing portion 2322b, that is, the anti-deformation capability of the pressing portion 2322a is greater than that of the sealing portion 2322b, so that the pressing portion 2322a can better press the sealing portion 2322b onto the bottom surface of the installation cavity 2311 to block the air inlet 2312. Exemplarily, the pressing portion 2322a can be made of a variety of materials, such as steel, iron or aluminum. Similarly, the sealing portion 2322b can also be made of a variety of materials, such as rubber, silicone or plastic.

[0365] Optionally, the connection structure between the pressing portion 2322a and the sealing portion 2322b may be various, such as clamping, bolting, or bonding.

[0366] By configuring the blocking member 2322 to include a clamping portion 2322a and a sealing portion 2322b, the clamping portion 2322a is disposed on the side of the sealing portion 2322b facing the valve cover 2315, and the sealing portion 2322b is used to block the air inlet 2312, and the two ends of the elastic member 2321 are respectively against the valve cover 2315 and the clamping portion 2322a, so that the elastic member 2321 can exert an elastic force on the sealing portion 2322b through the clamping portion 2322a, thereby facilitating improving the balance of the elastic force exerted by the elastic member 2321 on the sealing portion 2322b, and further effectively improving the blocking effect of the sealing portion 2322b on the air inlet 2312.

[0367] According to some embodiments of this application, please continue to refer to Figure 7 and Figure 8 As shown, the clamping portion 2322a has a first abutting surface 2322f facing the sealing portion 2322b, and the sealing portion 2322b has a second abutting surface 2322g facing the clamping portion 2322a. One of the first abutting surface 2322f and the second abutting surface 2322g is provided with a snap-fitting groove 2322h, and the other is provided with a snap-fitting portion 2322k, and the snap-fitting portion 2322k is snap-fitted with the snap-fitting groove 2322h.

[0368] The first abutting surface 2322f of the pressing portion 2322a and the second abutting surface 2322g of the sealing portion 2322b abut against each other, and both the first abutting surface 2322f and the second abutting surface 2322g are planes perpendicular to the thickness direction X of the wall portion.

[0369] 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 ​​portion 2322k, and the snap-fit ​​portion 2322k is snap-fitted 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 portion 2322a, or on the second abutting surface 2322g of the sealing portion 2322b. For example, in Figure 8 In the embodiment, the clamping portion 2322k is protruded on the second abutting surface 2322g of the sealing portion 2322b, the clamping groove 2322h is provided on the first abutting surface 2322f of the pressing portion 2322a, and the clamping portion 2322k is clamped in the clamping groove 2322h.

[0370] Exemplarily, the clamping portion 2322k is a circular columnar structure, and correspondingly, the clamping groove 2322h is a circular groove.

[0371] The clamping portion 2322a and the sealing portion 2322b have a first abutting surface 2322f and a second abutting surface 2322g facing each other. By providing a snap-in groove 2322h on one of the first abutting surface 2322f and the second abutting surface 2322g, and correspondingly providing a snap-in portion 2322k snap-fitting with the snap-in groove 2322h on the other, the structural stability of the sealing portion 2322b provided on the clamping portion 2322a can be improved, so as to reduce the radial slippage of the sealing portion 2322b relative to the clamping portion 2322a, and further help to improve the blocking effect of the sealing portion 2322b on the air inlet 2312, so as to reduce the phenomenon of the air inlet 2312 being accidentally opened.

[0372] In some embodiments, the sealing portion 2322b is bonded to the pressing portion 2322a.

[0373] The sealing part 2322b and the pressing part 2322a are connected by an adhesive structure. On the one hand, it can improve the structural stability of the sealing part 2322b connected to the pressing part 2322a, which is beneficial to reduce the risk of the sealing part 2322b and the pressing part 2322a being separated from each other, so as to improve the reliability of the sealing part 2322b blocking the air inlet 2312. On the other hand, it is easy to realize the assembly connection between the sealing part 2322b and the pressing part 2322a, which is beneficial to reduce the difficulty of assembly between the sealing part 2322b and the pressing part 2322a.

[0374] In some embodiments, the material of the sealing portion 2322b includes EPDM, fluororubber or Teflon.

[0375] The sealing part 2322b made of EPDM, fluororubber or Teflon makes the sealing part 2322b have better corrosion resistance, which can effectively alleviate the phenomenon of the sealing part 2322b being corroded by the electrolyte, thereby helping to improve the service life of the sealing part 2322b and reduce the phenomenon that the sealing part 2322b has poor effect in sealing the air inlet 2312 due to the corrosion of the sealing part 2322b.

[0376] According to some embodiments of the present 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 blocking member 2322 is L, satisfying 0mm<L≤2mm.

[0377] The size of the gap between the valve cover 2315 and the blocking member 2322 is L, that is, the distance between the valve cover 2315 and the blocking member 2322 in the thickness direction X of the wall is L.

[0378] Exemplarily, the size L of the gap between the valve cover 2315 and the sealing member 2322 can be 0 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, 1.2 mm, 1.5 mm, 1.8 mm or 2 mm, etc.

[0379] It should be noted that, in the embodiment in which the valve cover 2315 is protrudingly provided with a first guide column 2315b and the sealing member 2322 is protrudingly provided with a second guide column 2322c, L is the dimension of the gap formed between the first guide column 2315b and the second guide column 2322c in the thickness direction X of the wall; in the embodiment in which the valve cover 2315 is protrudingly provided with the first guide column 2315b and the sealing member 2322 is not protrudingly provided with the second guide column 2322c, L is the dimension of the gap formed between the first guide column 2315b and the surface of the sealing member 2322 facing the valve cover 2315 in the thickness direction X of the wall; in the embodiment in which the valve cover 2315 is not protrudingly provided with the first guide column 2315b and the sealing member 2322 is protrudingly provided with the second guide column 2322c, L is the dimension of the gap formed between the second guide column 2322c and the surface of the valve cover 2315 facing the sealing member 2322 in the thickness direction X of the wall.

[0380] By setting the size of the gap between the valve cover 2315 and the blocking piece 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 valve cover 2315 to the blocking piece 2322 can be reduced, so that there is space between the valve cover 2315 and the blocking piece 2322 for the blocking piece 2322 to move along the thickness direction X of the wall, so that when the gas inside the shell 21 pushes the blocking piece 2322, the blocking piece 2322 can open the air inlet 2312 for exhaust. On the other hand, 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 blocking piece 2322 can be alleviated, which is beneficial to improving the space utilization rate of the battery cell 20.

[0381] According to some embodiments of the present application, see Figure 5 As shown, the valve body 2314 is connected to the wall portion 211 by welding.

[0382] 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 hole 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 facing away from the electrode assembly 22 or to the surface of the wall portion 211 facing the electrode assembly 22.

[0383] By welding the valve body 2314 to the wall portion 211 , the structural stability and strength of the valve body 2314 connected to the wall portion 211 can be effectively improved, thereby reducing the risk of the valve body 2314 and the wall portion 211 falling off during use.

[0384] According to some embodiments of the present application, referring to Figure 5 , Figure 7 and Figure 8 , and please refer to Fig.16 , Fig.16 A partial cross-sectional view of a wall portion 211 of a housing 21 of a battery cell 20 provided in some embodiments of the present application. The wall portion 211 is provided with a mounting hole 2111, at least a portion of the valve body 2314 is accommodated in the mounting hole 2111, the hole wall surface of the mounting hole 2111 includes a first connection surface 2111a, the valve body 2314 includes a second connection surface 2314b, the first connection surface 2111a and the second connection surface 2314b are both arranged around the central axis of the mounting hole 2111, and the first connection surface 2111a is welded to the second connection surface 2314b.

[0385] The mounting hole 2111 provided on the wall portion 211 communicates with the inside and outside of the housing 21, and at least a portion of the valve body 2314 is accommodated in the mounting hole 2111, that is, the valve body 2314 of the valve body 231 of the one-way valve 23 may be entirely located in the mounting hole 2111, or may be only partially located in the mounting hole 2111. For example, in Figure 5 In the embodiment, part of the valve body 2314 is located in 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.

[0386] The hole wall 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 portion of the valve body 2314 located in the mounting hole 2111 is welded together with the hole wall of the mounting hole 2111.

[0387] The first connection surface 2111a and the second connection surface 2314b are both arranged around the central axis of the mounting hole 2111. That is, the first connection surface 2111a and the second connection surface 2314b are both annular structures, and the central axes of the first connection surface 2111a and the second connection surface 2314b are arranged colinearly with the central axis of the mounting hole 2111, so that the first connection surface 2111a and the second connection surface 2314b are welded to each other to form a weld mark of an annular structure.

[0388] The wall portion 211 is provided with a mounting hole 2111 for accommodating a valve body 2314 of the valve body 231, and the valve body 2314 has a second connecting surface 2314b, and the second connecting surface 2314b is welded to the first connecting surface 2111a of the hole wall surface of the mounting hole 2111 to enable the one-way valve 23 to be assembled to the wall portion 211. The structure in which the first connecting surface 2111a and the second connecting surface 2314b, both of which are arranged in an annular shape, are welded to each other can improve the connection reliability between the valve body 2314 and the wall portion 211 on the one hand, and can improve the sealing effect between the valve body 2314 and the hole wall surface of the mounting hole 2111 on the other hand.

[0389] According to some embodiments of the present application, see Figure 5 , Figure 8 and Fig.16 As shown, the first connection surface 2111a and the second connection surface 2314b are matched, and the first connection surface 2111a and the second connection surface 2314b are both arranged at an acute angle to the central axis of the mounting hole 2111.

[0390] The first connection surface 2111a and the second connection surface 2314b are matched, that is, the first connection surface 2111a and the second connection surface 2314b have the same shape and abut against each other.

[0391] The first connecting surface 2111a and the second connecting surface 2314b are both set at an acute angle to the central axis of the mounting hole 2111, that is, the first connecting surface 2111a and the second connecting surface 2314b are both inclined surfaces, that is, in the cross-section of the valve body 2314 parallel to the thickness direction X of the wall, the cross-sectional lines formed by the first connecting surface 2111a and the second connecting surface 2314b are collinear and set at an acute angle to the thickness direction X of the wall.

[0392] For example, in Figure 5 and Figure 8 In the embodiment, the end of the second connection surface 2314b 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 second connection surface 2314b away from the electrode assembly 22 in the thickness direction X of the wall. Figure 5 and Fig.16 In the embodiment, the end of the first connection surface 2111a 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 connection surface 2111a away from the electrode assembly 22 in the thickness direction X of the wall.

[0393] By setting the first connecting surface 2111a and the second connecting surface 2314b to be structures that fit together, and the first connecting surface 2111a and the second connecting surface 2314b are both 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, and the first connecting surface 2111a and the second connecting surface 2314b are both inclined structures, so that when the valve body 2314 is assembled into the mounting hole 2111, it is convenient for the first connecting surface 2111a and the second connecting surface 2314b to abut against each other, and the tightness of the mutual fit between the first connecting surface 2111a and the second connecting surface 2314b can be improved, which is beneficial to reducing the phenomenon of a gap between the first connecting surface 2111a and the second connecting surface 2314b, and can effectively improve the welding quality of the first connecting surface 2111a and the second connecting surface 2314b.

[0394] According to some embodiments of this application, please continue to refer to Figure 5 , Figure 8 and Fig.16 As shown, the mounting hole 2111 includes a first hole section 2111b and a second hole section 2111c, the first hole section 2111b and the second hole section 2111c are arranged along the thickness direction X of the wall portion, and the first hole section 2111b is located on the side of the second hole section 2111c away from the electrode assembly 22, and the aperture of the first hole section 2111b is larger than the aperture of the second hole section 2111c. The hole wall surface of the first hole section 2111b is the first connecting surface 2111a, and the valve body 2314 has a connecting portion 2314c located in the first hole section 2111b, and the outer peripheral surface of the connecting portion 2314c is the second connecting surface 2314b.

[0395] The aperture of the first hole segment 2111b is larger than the aperture of the second hole segment 2111c, that is, the mounting hole 2111 is 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, that is, the mounting hole 2111 is a stepped hole structure with the aperture gradually increasing from the end close to the electrode assembly 22 to the end away from the electrode assembly 22.

[0396] The hole wall surface of the first hole section 2111b is the first connecting surface 2111a, the valve body 2314 has a connecting portion 2314c located in the first hole section 2111b, and the outer peripheral surface of the connecting portion 2314c is the second connecting surface 2314b. That is to say, the valve body 2314 of the valve body 231 has a connecting portion 2314c of an annular structure extending along the circumference of the first hole section 2111b, the connecting portion 2314c is accommodated in the first hole section 2111b, and the outer peripheral surface of the connecting portion 2314c is welded to the hole wall surface of the first hole section 2111b.

[0397] Illustratively, the outer peripheral surface of the connecting portion 2314c is interconnected with the end surface of the valve body 2314 away from the electrode assembly 22, that is, the second connecting surface 2314b is interconnected with the end surface of the valve body 2314 away from the electrode assembly 22.

[0398] The mounting hole 2111 is provided with a first hole section 2111b and a second hole section 2111c arranged along the thickness direction X of the wall portion, the first hole section 2111b is located at the outer side of the second hole section 2111c away from the electrode assembly 22, and the aperture of the first hole section 2111b is larger than the aperture of the second hole section 2111c, so as to form the mounting hole 2111 with a stepped hole structure, by setting the hole wall surface of the first hole section 2111b as the first connecting surface 2111a, and the valve body 2314 has a connecting portion 2314c accommodated in the first hole section 2111b, and the connecting portion 231 The outer peripheral surface of 4c is the second connecting surface 2314b, which makes it easy to assemble the valve body 2314 from the outside of the wall portion 211 into the mounting hole 2111, so that 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, so that the mounting hole 2111 and the connecting portion 2314c of the stepped hole structure can cooperate to play a certain limiting and positioning role on the valve body 2314, which helps to reduce the difficulty of assembling the valve body 2314 into the mounting hole 2111.

[0399] According to some embodiments of the present application, see Figure 5 , Figure 7 and Figure 8 As shown, along the thickness direction X of the wall, the end surface of the valve body 2314 away from the electrode assembly 22 is connected to the second connecting surface 2314b, and a first stress release groove 2314d is provided on the end surface of the valve body 2314 away from the electrode assembly 22.

[0400] Illustratively, the first stress relief groove 2314 d is disposed on a surface of the connecting portion 2314 c of the valve body 2314 that is away from the electrode assembly 22 .

[0401] 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 being an annular groove structure, and the second stress relief groove being provided around the mounting hole 2111, so as to absorb the welding stress generated by the welding connection between the valve body 2314 and the wall portion 211 through the second stress relief groove. In some embodiments, the first stress relief groove 2314d and the second stress relief groove may be provided at the same time.

[0402] By setting a first stress release groove 2314d on the end face of the valve body 2314 away from the electrode assembly 22 in 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 release groove 2314d, thereby reducing the influence of the welding stress on the weld connecting the first connecting surface 2111a and the second connecting surface 2314b, reducing the risk of weld cracking, and further reducing the risk of sealing failure at the weld.

[0403] In some embodiments, please see Figure 6 , Figure 7 and Figure 8 As shown, the first stress release groove 2314d is arranged around the central axis of the mounting hole 2111. That is, the first stress release groove 2314d is an annular groove structure. Exemplarily, the first stress release groove 2314d is arranged around the outer side of the valve cover 2315.

[0404] By setting the first stress release groove 2314d as an annular structure arranged around the central axis of the mounting hole 2111, it is beneficial to enhance the absorption effect of the first stress release 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, so as to further reduce the influence of the welding stress on other components such as the valve core 232 of the one-way valve 23.

[0405] According to some embodiments of the present 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 the 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 to the inside of the housing 21 is received in the receiving portion 262.

[0406] The insulating member 26 is disposed on a side of the wall portion 211 facing the electrode assembly 22 , and the insulating member 26 serves to separate the wall portion 211 from the electrode assembly 22 to insulate and isolate the wall portion 211 from the electrode assembly 22 .

[0407] Exemplarily, the insulating member 26 may be made of various materials, such as rubber, silicone or plastic.

[0408] The wall portion 211 has a second surface 2114 facing the electrode assembly 22, and the one-way valve 23 protrudes from the second surface 2114. That is, the one-way valve 23 is arranged in 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, Figure 5 In the embodiment, the valve body 2314 of the valve body 231 of the one-way valve 23 protrudes from the second surface 2114 .

[0409] The portion of the one-way valve 23 extending into the housing 21 is accommodated in the accommodation portion 262 , that is, the insulating member 26 is provided with an accommodation portion 262 at a position corresponding to the one-way valve 23 , and the accommodation portion 262 covers the outer side of the portion of the one-way valve 23 protruding from the second surface 2114 .

[0410] Optionally, the main body 261 and the accommodating portion 262 of the insulating member 26 can be an integral structure or a split structure. When the main body 261 and the accommodating portion 262 are an integral structure, the main body 261 and the accommodating portion 262 can be integrally formed by injection molding or milling. When the main body 261 and the accommodating portion 262 are a split structure, the accommodating portion 262 can be connected to the main body 261 by bonding or snapping.

[0411] The battery cell 20 is also provided with an insulating member 26, which includes a main body portion 261 and a receiving portion 262 that are interconnected. The main body portion 261 is arranged 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 through the main body portion 261, and the receiving portion 262 can accommodate the part of the one-way valve 23 protruding from the second surface 2114 of the wall portion 211 to avoid and protect the one-way valve 23, and can insulate and isolate the electrode assembly 22 and the one-way valve 23 to reduce the risk of short circuit between the one-way valve 23 and the electrode assembly 22.

[0412] According to some embodiments of the present application, see Figure 5 As shown, the one-way valve 23 includes a valve body 231, and along the thickness direction X of the wall portion, 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, and the air inlet 2312 is configured to discharge the gas inside the housing 21. The accommodating portion 262 is provided with a second through hole 2621, and the second through hole 2621 is communicated with the air inlet 2312.

[0413] Among them, a second through hole 2621 is set on the accommodating portion 262, and the second through hole 2621 penetrates the accommodating portion 262, so that the second through hole 2621 can connect the interior of the accommodating portion 262 and the interior of the shell 21, so that the air inlet 2312 of the valve body 231 can connect to the interior of the shell 21 through the second through hole 2621.

[0414] By setting a second through hole 2621 on the accommodating portion 262, the second through hole 2621 can connect the interior of the shell 21 and the interior of the accommodating portion 262, so that the air inlet 2312 of the valve body 231 of the one-way valve 23 can be connected with the interior of the shell 21 through the second through hole 2621, so that the gas inside the shell 21 can enter the accommodating portion 262 through the second through hole 2621 and then be discharged to the outside of the shell 21 through the one-way valve 23. Therefore, there is no need for the gas to enter the accommodating portion 262 through the gap between the main body 261 and the wall portion 211 and then be discharged through the one-way valve 23, which is beneficial to improving the smoothness of the one-way valve 23 to discharge the gas inside the shell 21.

[0415] According to some embodiments of the present application, referring to Figure 5 , and please refer to Fig.17 , Fig.17 A partial cross-sectional view of the insulating member 26 of the battery cell 20 provided in some embodiments of the present application. Along the thickness direction X of the wall portion, the air inlet 2312 is provided at one end of the valve body 231 facing the electrode assembly 22. The accommodating portion 262 includes a first wall 2622 and a second wall 2623, the first wall 2622 is provided around 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, the second wall 2623 is connected to one end of the first wall 2622 away from the body portion 261, and the second through hole 2621 is provided in the second wall 2623.

[0416] Among them, along the thickness direction X of the wall, the air inlet 2312 is arranged at one end of the valve body 231 facing the electrode assembly 22, that is, the air inlet 2312 is arranged on the bottom surface of the installation cavity 2311 and the valve cover 2315 arranged opposite to each other.

[0417] The first wall 2622 is disposed around the valve body 231 , that is, the first wall 2622 of the accommodating portion 262 is an annular structure disposed around the valve body 231 .

[0418] 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 accommodating portion 262 for accommodating a part of the valve body 231. The second wall 2623 is a wall facing the accommodating portion 262 and the air inlet 2312.

[0419] The second through hole 2621 is disposed on the second wall 2623, that is, the second through hole 2621 is disposed on one end of the accommodating 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 one side of the accommodating portion 262 in the radial direction of the accommodating portion 262.

[0420] The accommodating portion 262 is provided with a first wall 2622 and a second wall 2623 which are connected to each other. The first wall 2622 is arranged around the valve body 231, and the second wall 2623 is located at one 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 a accommodating portion 262 for accommodating the portion of the valve body 231 extending to the inside of the outer shell 21. By arranging the second through hole 2621 of the accommodating portion 262 on the first wall 2622, it is helpful to increase the path of the gas entering the air inlet 2312 of the valve body 231 from the second through hole 2621, so as to alleviate the phenomenon that the electrolyte overflows with the gas. By arranging the second through hole 2621 of the accommodating portion 262 on the second wall 2623, it is helpful to realize the corresponding arrangement of the air inlet 2312 and the second through hole 2621, so as to improve the smoothness of the one-way valve 23 discharging the gas inside the outer shell 21.

[0421] According to some embodiments of the present application, see Figure 5 and Fig.17 As shown, the receiving portion 262 is integrally formed with the main body 261. In other words, the receiving portion 262 and the main body 261 are an integrated structure.

[0422] The main body portion 261 and the receiving portion 262 of the insulating member 26 are provided as an integrally formed structure, thereby facilitating the improvement of the structural strength and structural stability of the receiving portion 262 connected to the main body portion 261 .

[0423] Of course, the structure of the insulating member 26 is not limited to this, and the insulating member 26 can also be other structures, for example, Fig.18 and Fig.19 , Fig.18 A partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application, Fig.19 This is a partial cross-sectional view of the insulating member 26 of the battery cell 20 provided in some other embodiments of the present application. The receiving portion 262 and the main body 261 are provided separately. In other words, the receiving portion 262 and the main body 261 are of a split structure.

[0424] By providing the main body portion 261 and the accommodating portion 262 of the insulating member 26 as separate structures, it is helpful to reduce the difficulty of processing the insulating member 26 and thus reduce the manufacturing cost of the insulating member 26 .

[0425] According to some embodiments of this application, please continue to refer to Fig.18 and Fig.19As shown, in an embodiment in which the main body portion 261 and the accommodating portion 262 of the insulating member 26 are split structures, the accommodating portion 262 may further include a flange portion 2624, the flange portion 2624 being connected to an end of the first wall 2622 away from the second wall 2623, at least a portion of the flange portion 2624 being stacked with the main body portion 261, and the flange portion 2624 abuts against the side of the main body portion 261 facing the wall portion 211.

[0426] Among them, at least a part of the flange portion 2624 is stacked with the main body portion 261, and the flange portion 2624 abuts against the side of the main body portion 261 facing the wall portion 211, that is, the flange portion 2624 is located on the side of the main body portion 261 facing the wall portion 211, and the flange portion 2624 and the main body portion 261 abut against each other along the thickness direction X of the wall portion, so that the flange portion 2624 and the second wall 2623 are respectively located on both sides of the main body portion 261, so that the accommodating portion 262 can be snapped onto the main body portion 261. Of course, in other embodiments, the flange portion 2624 of the accommodating portion 262 can also be located on the side of the main body portion 261 away from the wall portion 211, and the flange portion 2624 is connected to the main body portion 261 by bonding.

[0427] exist Fig.19 In the figure, the main body 261 is provided with an assembly hole 2611, which passes through both sides of the main body 261 along the thickness direction X of the wall, and the first wall 2622 of the accommodating portion 262 is penetrated into the assembly hole 2611, so that the flange portion 2624 and the second wall 2623 are respectively located on both sides of the main body 261.

[0428] Exemplarily, the thickness direction of the flange portion 2624 and the thickness direction of the second wall 2623 are both the same as the thickness direction X of the wall portion, and the flange portion 2624 is an annular structure surrounding the outer side of the first wall 2622. Of course, in other embodiments, the flange portion 2624 may also be a plurality of protruding structures protruding from the outer side of the first wall 2622.

[0429] The accommodating portion 262 is also provided with a flange portion 2624. By connecting the flange portion 2624 to one 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 main body 261 in the thickness direction X of the wall portion, and the flange portion 2624 abuts against the side of the main body 261 facing the wall portion 211, so as to realize the connection of the accommodating portion 262 to the main body 261. The structure is simple and easy to assemble.

[0430] According to some embodiments of the present application, see Fig.18 and Fig.19 As shown, along the thickness direction X of the wall portion, a receiving groove 2612 is provided on the surface of the main body portion 261 facing the wall portion 211 , and the flange portion 2624 is received in the receiving groove 2612 .

[0431] Among them, the accommodating groove 2612 is arranged on the surface of the side of the main body 261 away from the electrode assembly 22, and the accommodating groove 2612 passes through the hole wall surface of the assembly hole 2611, so that the flange portion 2624 can be accommodated in the accommodating groove 2612 and overlap the groove bottom surface of the accommodating groove 2612.

[0432] By providing an accommodating groove 2612 for accommodating the flange portion 2624 on the surface of the main body 261 facing the wall portion 211, the space occupied by the flange portion 2624 and the main body 261 in the thickness direction X of the wall portion can be reduced, and the interference effect of the flange portion 2624 on the mutual abutment between the main body 261 and the wall portion 211 can be reduced.

[0433] In some embodiments, please see Fig.18 and Fig.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 .

[0434] The surface of the flange portion 2624 facing the wall portion 211 is flush with the surface of the main body portion 261 facing the wall portion 211 , that is, the dimension of the flange portion 2624 in the thickness direction X of the wall portion is the same as the depth of the accommodating groove 2612 .

[0435] Optionally, the surface of the body facing the wall portion 211 is used to abut against the wall portion 211 , so that the flange portion 2624 is clamped between the wall portion 211 and the bottom surface of the accommodating groove 2612 along the thickness direction X of the wall portion.

[0436] By setting the surface of the flange portion 2624 facing the wall portion 211 and the surface of the main body portion 261 facing the wall portion 211 to be flush with each other, the wall portion 211 and the bottom surface of the accommodating groove 2612 can cooperate to clamp and limit the flange portion 2624 to a certain extent, thereby reducing the phenomenon of movement of the accommodating portion 262 along the thickness direction X of the wall portion.

[0437] According to some embodiments of the present application, referring to Figure 4 , Figure 5 and Figure 6 , and please refer to Fig. 20 , Fig.21 and Fig. 22 , Fig. 20 A top view of a battery cell 20 (after removing the protective patch 29) provided in some embodiments of the present application, Fig.21 for Fig. 20 The partial enlarged view of the battery cell 20 at A shown in FIG. Fig. 22Schematic diagram of the connection between the shielding member 27 and the wall portion 211 of the battery cell 20 provided in some embodiments of the present application. The battery cell 20 may also include a shielding member 27, which is installed 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 the shielding member 27 covers the one-way valve 23. The one-way valve 23 has an outlet 2313, and the outlet 2313 is used to discharge the gas inside the shell 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, and the exhaust channel 28 connects the outlet 2313 and the outside of the shell 21.

[0438] There may be various structures for mounting the shielding member 27 on the wall portion 211. For example, the shielding member 27 may be mounted on the wall portion 211 by welding, interference fit, bolt connection, clamping or bonding.

[0439] 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. 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.

[0440] 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, and the exhaust channel 28 connects the gas outlet 2313 and the outside of the shell 21, that is, the gas outlet 2313 of the one-way valve 23 is connected to the outside of the shell 21 through the exhaust channel 28, so that the one-way valve 23 can discharge the gas inside the shell 21, and the exhaust channel 28 can be provided on the shielding member 27, that is, the exhaust channel 28 is a through hole provided on the shielding member 27, or the exhaust channel 28 can be formed between the shielding member 27 and the wall portion 211, that is, the exhaust channel 28 is a gap formed between the shielding member 27 and the wall portion 211.

[0441] For example, in Fig.21 and Fig. 22 In the embodiment, the exhaust passage 28 is formed between the shielding member 27 and the wall portion 211 , that is, the exhaust passage 28 is formed in a gap between the shielding member 27 and the wall portion 211 .

[0442] 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 the shielding member 27 covers the one-way valve 23, so that the shielding member 27 can provide a certain protection and shielding effect on 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 can reduce the risk of impurities or particulate matter in the external environment entering the one-way valve 23, which is beneficial to improving the service life of the one-way valve 23. On the other hand, covering the one-way valve 23 by the shielding member 27 can enhance the aesthetics of the outer surface of the battery cell 20. On the other hand, it is convenient to connect other components such as the detection element on the side of the shielding member 27 away from the one-way valve 23, so as to reduce the interference of the area where the one-way valve 23 is set on the wall portion 211 on the connection detection element and other components.

[0443] According to some embodiments of the present application, see Figure 4 , Figure 5 and Fig. 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 arranged in the mounting hole 2111, and at least a portion of the shielding member 27 is accommodated in the mounting groove 2113.

[0444] 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 passes through the bottom surface of the mounting groove 2113 , so that the mounting hole 2111 is connected to the outside of the shell 21 through the mounting groove 2113 .

[0445] At least part of the shielding member 27 is accommodated in the mounting groove 2113, that is, the shielding member 27 may be entirely located in the mounting groove 2113, or only part of it may be located in the mounting groove 2113. Figure 5 In the embodiment, the shielding member 27 is entirely located in the mounting groove 2113 .

[0446] By providing an installation groove 2113 on the first surface 2112 of the wall portion 211 away from the electrode assembly 22, and at least partially accommodating the shielding member 27 in the installation 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 installation groove 2113 can play a certain positioning and limiting role for the shielding member 27, which is beneficial to reducing the difficulty of assembling the shielding member 27 connected to the wall portion 211.

[0447] According to some embodiments of the present application, see Fig. 20 , Fig.21 and Fig. 22 As shown, the exhaust channel 28 includes a third exhaust gap 281 , which is formed between the shielding member 27 and the groove side of the mounting groove 2113 , and is used to connect the air outlet 2313 and the outside of the housing 21 .

[0448] Among them, the third exhaust gap 281 is used to connect the air outlet 2313 and the outside of the shell 21. The third exhaust gap 281 can be directly connected to the air outlet 2313. For example, at least part of the projection of the third exhaust gap 281 in the thickness direction X of the wall is located in the mounting hole 2111, so that the air outlet 2313 of the one-way valve 23 arranged in the mounting hole 2111 can be directly connected to the third exhaust gap 281. Of course, the third exhaust gap 281 can also be indirectly connected to the air outlet 2313. For example, Fig. 22 In the embodiment, the exhaust channel 28 may further include a fourth exhaust gap 282 formed between the shielding member 27 and the bottom surface of the mounting groove 2113 , and the fourth exhaust gap 282 connects the third exhaust gap 281 and the air outlet 2313 of the one-way valve 23 .

[0449] A third exhaust gap 281 connected to the outside of the outer shell 21 is formed between the covering member 27 and the side surface of the installation groove 2113, so that the gas exhausted from the one-way valve 23 can be discharged to the outside of the outer shell 21 through the third exhaust gap 281. The battery cell 20 adopting this structure does not need to have a hole on the covering member 27, which helps to reduce the processing difficulty and improve the appearance of the battery cell 20.

[0450] It should be noted that the structure of the third exhaust gap 281 can be various. In some embodiments, see Fig.21 As shown, the outer peripheral surface of the shielding member 27 includes a first corner surface 271 and at least two first side surfaces 272, and the first corner surface 271 connects 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, and the second corner surface 2113a connects two adjacent second side surfaces 2113b. Each second side surface 2113b is connected to a first side surface 272, and a third exhaust gap 281 is formed between the second corner surface 2113a and the first corner surface 271.

[0451] Among them, 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, that is, the first corner surface 271 is the surface at the corner of the outer peripheral surface of the shielding member 27.

[0452] 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, that is, the second corner surface 2113a is the surface at the corner of the groove side surface of the mounting groove 2113.

[0453] Each first side surface 272 of the shielding member 27 abuts against and is connected to the corresponding second side surface 2113b of the groove side surface of the mounting groove 2113, so that the first corner surface 271 of the shielding member 27 is facing the second corner surface 2113a of the groove side surface of the mounting groove 2113, so that a third exhaust gap 281 is formed between the first corner surface 271 and the second corner surface 2113a.

[0454] Optionally, the connection structure between the first side surface 272 and the second side surface 2113b can be various, such as welding, bonding or interference fit.

[0455] For example, in Fig. 20 and Fig.21 In the figure, the shielding member 27 and the mounting groove 2113 are both rectangular structures, so that four first corner surfaces 271 are correspondingly formed at the four corners of the shielding member 27, and correspondingly, four second corner surfaces 2113a are correspondingly formed at the four corners of the groove side of the mounting groove 2113, so that four third exhaust gaps 281 are formed between the shielding member 27 and the groove side of the mounting groove 2113.

[0456] Of course, the structure of the third exhaust gap 281 formed between the shielding member 27 and the groove side of the installation groove 2113 is not limited thereto. For example, in other embodiments, refer to Fig.23 , Fig.23 Schematic diagram of the structure of the shielding member 27 in other embodiments provided in some embodiments of the present application. A second groove 273 is provided on the outer circumference of the shielding member 27, and the outer circumference of the shielding member 27 is used to connect with the groove side of the installation groove 2113 to form a third exhaust gap 281 between the groove bottom surface of the second groove 273 and the groove side of the installation groove 2113. In this embodiment, the outer circumference of the shielding member 27 can be welded or bonded to the groove side of the installation groove 2113. Similarly, in other embodiments, refer to Fig.24 , Fig.24Schematic diagram of the structure of the shielding member 27 provided in some embodiments of the present application in other embodiments. A plurality of abutment portions 274 are convexly provided on the outer circumferential surface of the shielding member 27, and the plurality of abutment portions 274 are arranged at intervals along the circumference of the shielding member 27, and the abutment portions 274 are used to connect with the groove side of the installation groove 2113, so as to form a third exhaust gap 281 between the area of ​​the shielding member 27 where the abutment portions 274 are not provided and the groove side of the installation groove 2113. In this embodiment, the abutment portions 274 and the groove side of the installation groove 2113 can be interference fit, welded or bonded, etc.

[0457] The two adjacent first side surfaces 272 in the outer peripheral surface of the shielding member 27 are connected by the first corner surface 271, and the two connected second side surfaces 2113b in the groove side surfaces of the mounting groove 2113 are connected by the 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. In other words, a third exhaust 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 the third exhaust 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 realizing the formation of the third exhaust 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.

[0458] According to some embodiments of the present application, see Fig. 20 and Fig.21 As shown, the first corner surface 271 and the second corner surface 2113a are both arc surfaces, and the radius of the first corner surface 271 is greater than the radius of the second corner surface 2113a.

[0459] Among them, the first corner surface 271 and the second corner surface 2113a are both arc surfaces, that is, the first corner surface 271 is a surface formed at the rounded corner of the outer peripheral surface of the shielding member 27, and similarly, the second corner surface 2113a is a surface formed at the rounded corner of the groove side surface of the installation groove 2113. Of course, in other embodiments, the first corner surface 271 can also be a surface formed at the chamfer of the outer peripheral surface of the shielding member 27, and the second corner surface 2113a can also be a surface formed at the chamfer of the groove side surface of the installation groove 2113.

[0460] The radius of the first corner surface 271 is greater than the radius of the second corner surface 2113 a , that is, the diameter of the rounded corner of the outer peripheral surface of the shielding member 27 is greater than the diameter of the rounded corner of the groove side surface of the installation groove 2113 .

[0461] By setting the first corner surface 271 and the second corner surface 2113a to arc surfaces, and the radius of the first corner surface 271 is 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, which has a simple structure and is easy to manufacture and process.

[0462] In some embodiments, the first side surface 272 is connected to the second side surface 2113b by welding.

[0463] By setting the first side surface 272 and the second side surface 2113b as a mutually welded structure, it is helpful to improve the connection firmness between the shielding member 27 and the groove side surface of the installation groove 2113, so as to improve the structural stability of the shielding member 27 assembled to the wall portion 211.

[0464] In some embodiments, see Fig. 20 and Fig.21 As shown, the cross section of the shielding member 27 in the thickness direction X perpendicular to the wall is rectangular, and the outer peripheral surface of the shielding member 27 includes four first side surfaces 272 and four first corner surfaces 271 , and a third exhaust gap 281 is formed at at least one first corner surface 271 .

[0465] Among them, a third exhaust gap 281 is formed at at least one first corner surface 271, that is, among the four first corner surfaces 271 of the shielding member 27, only one first corner surface 271 may have a third exhaust gap 281 formed at the position where the third exhaust gap 281 is located, or two, three or four first corner surfaces 271 may have a third exhaust gap 281 formed at the positions where the third exhaust gap 281 is located.

[0466] It should be noted that, in other embodiments, the cross-section of the shielding member 27 in the direction X perpendicular to the thickness of the wall portion may also be a triangle, a pentagon, a hexagon, a trapezoid, or the like.

[0467] By configuring 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 four right angles of the shielding member 27 , which has a simple structure and is easy to manufacture.

[0468] According to some embodiments of the present application, see Fig. 22 As shown, the exhaust channel 28 may further include a fourth exhaust gap 282 formed between the shielding member 27 and the bottom surface of the mounting groove 2113 , and the fourth exhaust gap 282 connects the third exhaust gap 281 and the air outlet 2313 .

[0469] Among them, the fourth exhaust gap 282 is formed between the shielding member 27 and the bottom surface of the mounting groove 2113. The shielding member 27 and the bottom surface of the mounting groove 2113 can be arranged at intervals along the thickness direction X of the wall portion, 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, the first groove 2751 is 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.

[0470] It should be noted that in other embodiments, a first groove 2751 may be provided on the bottom surface of the mounting groove 2113 to form a fourth exhaust gap 282 between the bottom surface of the first groove 2751 and the surface of the shielding member 27 facing the bottom surface of the mounting groove 2113 .

[0471] The exhaust channel 28 also includes a fourth exhaust gap 282 formed between the covering member 27 and the bottom surface of the mounting groove 2113, and the fourth exhaust gap 282 connects the third exhaust gap 281 and the gas outlet 2313 to alleviate the phenomenon of exhaust obstruction between the gas outlet 2313 and the third exhaust gap 281 caused by the covering member 27 abutting against the bottom surface of the mounting groove 2113, thereby improving the smoothness of gas discharge from the gas outlet 2313 of the one-way valve 23 to the third exhaust gap 281.

[0472] In some embodiments, reference Figure 5 and Fig. 22 , and please refer to Fig.25 , Fig.25 A bottom view of a shielding member 27 of a battery cell 20 provided in some embodiments of the present application. Along the thickness direction X of the wall portion, 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, and 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.

[0473] Among them, the third surface 275 overlaps the bottom surface of the installation groove 2113, that is, part of the third surface 275 abuts against the bottom surface of the installation groove 2113, that is, along the thickness direction X of the wall, the shielding member 27 abuts against the bottom surface of the installation groove 2113.

[0474] 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 groove side surface of the first groove 2751 and the bottom surface of the mounting groove 2113 jointly define the fourth exhaust gap 282 .

[0475] By overlapping the third surface 275 of the shielding member 27 on the bottom surface of the mounting groove 2113, the shielding member 27 is abutted against the bottom surface of the mounting groove 2113, so as to improve the structural stability and reliability of the shielding member 27 installed in the mounting groove 2113. In addition, by setting the 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, so that the gas discharged from the outlet 2313 of the one-way valve 23 can enter the third exhaust gap 281 through the first groove 2751 and then be discharged to the outside of the shell 21, so that the shielding member 27 can be abutted against the bottom surface of the mounting groove 2113 and the third exhaust gap 281 can be connected with the outlet 2313 through the first groove 2751.

[0476] In some embodiments, see Fig. 20 , Fig.21 and Fig.25 As shown, a plurality of third exhaust gaps 281 are formed between the shielding member 27 and the groove side surface of the mounting groove 2113, and the plurality of third exhaust gaps 281 are arranged at intervals along the circumference of the shielding member 27. A plurality of first grooves 2751 are provided on the third surface 275, and each third exhaust gap 281 is connected to a first groove 2751.

[0477] In the embodiment where the third exhaust gap 281 is formed between the first corner surface 271 and the second corner surface 2113a, see Fig.25 As shown, the first groove 2751 extends radially along the shielding member 27, and the first groove 2751 passes through the first corner surface 271, so that the fourth exhaust gap 282 formed between the groove bottom surface of the first groove 2751 and the groove bottom surface of the mounting groove 2113 can be connected with the third exhaust gap 281 formed between the first corner surface 271 and the second corner surface 2113a.

[0478] Exemplarily, the shielding member 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 shielding member 27 , and each first groove 2751 passes through a first corner surface 271 .

[0479] A plurality of third exhaust gaps 281 are formed between the shielding member 27 and the groove side surface of the mounting groove 2113 , and each third exhaust gap 281 is connected to a first groove 2751 , thereby facilitating further improving the exhaust efficiency.

[0480] According to some embodiments of the present application, see Figure 5 and Fig.25As shown, the third surface 275 may also be provided with a second groove 2752 , a plurality of first grooves 2751 are provided around the second groove 2752 and are all connected to the second groove 2752 , and the second groove 2752 is connected to the air outlet 2313 .

[0481] Exemplarily, four first grooves 2751 are provided on the third surface 275 of the shielding member 27 . The four first grooves 2751 are arranged at intervals along the circumference of the second groove 2752 . The first grooves 2751 extend along the radial direction of the shielding member 27 and penetrate the groove side surface of the second groove 2752 .

[0482] By setting a second groove 2752 on the third surface 275 of the shielding member 27 facing the one-way valve 23, the second groove 2752 is connected to the air outlet 2313 of the one-way valve 23, and a plurality of first grooves 2751 are set around the second groove 2752 and are all connected to the second groove 2752, so that the gas discharged from the air outlet 2313 of the one-way valve 23 can enter the second groove 2752 and then pass through the plurality of first grooves 2751 and then pass through the corresponding third exhaust gaps 281 to be discharged to the outside of the outer shell 21, which is beneficial to improving the exhaust efficiency and can alleviate the phenomenon of gas accumulation between the shielding member 27 and the one-way valve 23.

[0483] In some embodiments, see Figure 5 As shown, along the thickness direction X of the wall, the gas outlet 2313 is arranged at the end of the one-way valve 23 away from the electrode assembly 22 , the gas outlet 2313 is arranged facing the second groove 2752 , and the projection of the gas outlet 2313 is located in the second groove 2752 .

[0484] Exemplarily, the projection of the one-way valve 23 in the thickness direction X of the wall is entirely located in the second groove 2752 .

[0485] By arranging the air outlet 2313 of the one-way valve 23 and the second groove 2752 to be structures facing each other, and the projection of the air outlet 2313 in the thickness direction X of the wall is located in the second groove 2752, so that the second groove 2752 is a structure covering the air outlet 2313 in the thickness direction X of the wall, so that the gas discharged from the air 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.

[0486] According to some embodiments of the present application, see Figure 5 As shown, along the thickness direction X of the wall portion, the shielding member 27 does not extend beyond the first surface 2112 .

[0487] The shielding member 27 does not extend beyond the first surface 2112 , that is, the shielding member 27 does not extend out of the installation groove 2113 in the thickness direction X of the wall portion, so that the entire shielding member 27 is located in the installation groove 2113 .

[0488] By setting the shielding member 27 so as not to extend beyond the first surface 2112 of the wall 211 away from the electrode assembly 22 in the thickness direction X of the wall, the shielding member 27 can be protected to a certain extent by the installation groove 2113, thereby further reducing the wear of the shielding member 27.

[0489] In some embodiments, please see Figure 5 As shown, the shielding member 27 has a fourth surface 276 facing away from the one-way valve 23 , and the fourth surface 276 is flush with the first surface 2112 .

[0490] 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 convenient to set information codes or connect other components such as detection elements on the fourth surface 276 of the shielding member 27.

[0491] It should be noted that the information code can be a QR code, a barcode, numbers or text, and the information of the battery cell 20 can be obtained by scanning or manually inputting the information code. The detection element can include a circuit board and a sampling terminal electrically connected to the circuit board, and the sampling terminal includes a metal sheet (such as a nickel sheet), a temperature sensor, etc.

[0492] In some embodiments, the shielding member 27 is fixedly connected to the wall portion 211 .

[0493] Optionally, the shielding member 27 and the wall portion 211 may be fixedly connected in various structures. For example, the shielding member 27 may be connected to the wall portion 211 by welding, bonding or interference fit.

[0494] By setting the shielding member 27 as a structure fixedly connected to the wall portion 211, the risk of the shielding member 27 detaching from the wall portion 211 during use can be reduced, and the firmness of the connection between the shielding member 27 and the wall portion 211 can be improved, so as to facilitate setting information codes on the shielding member 27 or connecting other components such as detection elements.

[0495] According to some embodiments of the present application, see Figure 3 and Figure 4 As shown, the battery cell 20 may also include a protective patch 29, which is arranged on the side of the wall 211 away from the electrode assembly 22, and is provided with an information collection hole 291 that penetrates the protective patch 29, and the projection of the information collection hole 291 in the thickness direction X of the wall is located within the shielding member 27.

[0496] The protective patch 29 is disposed on the side of the wall 211 away from the electrode assembly 22, that is, the protective patch 29 is disposed on the outer surface of the wall 211 to protect the wall 211. The protective patch 29 can be made of various materials, such as rubber, silicone or plastic.

[0497] The protective patch 29 is provided with an information collection hole 291 penetrating the protective patch 29 , and the information collection hole 291 serves to expose part of the shell 21 of the battery cell 20 , so as to facilitate setting of information codes on the shell 21 or connecting detection elements for sampling.

[0498] The projection of the information collection hole 291 in the thickness direction X of the wall is located inside the shielding member 27, that is, the information collection hole 291 is arranged corresponding to the shielding member 27, and the shielding member 27 covers the information collection hole 291, so that the exposed area of ​​the information collection hole 291 is the surface of the shielding member 27, so that the information code can be set on the shielding member 27 or the detection element for sampling can be connected.

[0499] Exemplarily, the exposed surface of the shielding member 27 corresponding to the information collection hole 291 is a plane.

[0500] Optionally, the protective patch 29 may be disposed on the wall portion 211 in various structures, and the protective patch 29 may be disposed on the wall portion 211 by bonding, adsorption, or the like.

[0501] It should be noted that in the embodiment where the electrode terminal 24 is provided on the wall portion 211, see Figure 3 and Figure 4 As shown, along the thickness direction X of the wall portion, the protective patch 29 is provided with a second avoidance hole 292 at the position where the electrode terminal 24 is located, and the second avoidance hole 292 runs through both sides of the protective patch 29. The second avoidance hole 292 is used to allow the electrode terminal 24 to pass through to avoid the electrode terminal 24. Exemplarily, two electrode terminals 24 are provided on the wall portion 211, and correspondingly, the protective patch 29 is provided with two second avoidance holes 292, and each second avoidance hole 292 is used for one electrode terminal 24 to pass through.

[0502] In the embodiment where the pressure relief mechanism 25 is provided on the wall portion 211, see Figure 3 and Figure 4 As shown, along the thickness direction X of the wall, a third avoidance hole 293 is provided on the protective patch 29 corresponding to the position where the pressure relief mechanism 25 is located. The third avoidance hole 293 runs through 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 avoidance hole 293, so that the third avoidance hole 293 can avoid the pressure relief mechanism 25.

[0503] The battery cell 20 is also provided with a protective patch 29. By providing 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 collection hole 291 on the protective patch 29, and the projection of the information collection hole 291 in the thickness direction X of the wall is located in the shielding member 27, the information collection hole 291 is a structure corresponding to the shielding member 27. On the one hand, it is convenient to set the information code on the shielding member 27 or connect the detection element and other components used for sampling, so as to reduce the sampling On the one hand, it can prevent the damage and pulling of the one-way valve 23 by the detection elements and other components, and on the other hand, it can improve the aesthetics of the outer surface of the battery cell 20. On the other hand, by correspondingly arranging the shielding member 27 and the information collection hole 291 of the protective patch 29, the area where the battery cell 20 is exhausted through the one-way valve 23 can be corresponding to the area where the information collection hole 291 is set on the protective patch 29, thereby saving the space occupied by the information collection hole 291 and the shielding member 27 on the outer surface of the shell 21, which is beneficial to improving the integration of the battery cell 20.

[0504] According to some embodiments of the present application, referring to Figure 3 , and please refer to Fig.26 , Fig.26 Schematic diagram of the connection between the protective patch 29 and the wall 211 provided in some embodiments of the present application. An exhaust port 283 connected to the outside of the housing 21 is formed at one end of the exhaust channel 28, and the protective patch 29 covers the exhaust port 283 along the thickness direction X of the wall.

[0505] Among them, an exhaust port 283 communicating with the outside of the housing 21 is formed at one end of the exhaust channel 28, that is, the exhaust channel 28 formed between the shielding member 27 and the wall portion 211 and communicating with the outside of the housing 21 forms the exhaust port 283. In the embodiment where the exhaust channel 28 includes the third exhaust gap 281 and the fourth exhaust gap 282, the exhaust port 283 is formed at one end of the third exhaust gap 281 for communicating with the outside of the housing 21.

[0506] Along the thickness direction X of the wall, the protection 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 inside the protection patch 29 .

[0507] It should be noted that, in some embodiments, the protective patch 29 may cover the entire one-way valve 23 to protect the one-way valve 23, and in this case, the shielding member 27 may not be provided. When the protective patch 29 covers the entire one-way valve 23, a gas channel is formed between the protective patch 29 and the wall portion 211 to allow the gas discharged from the gas outlet 2313 of the one-way valve 23 to be released to the outside of the battery cell 20.

[0508] By setting the protective patch 29 to cover the exhaust port 283 at one end of the exhaust channel 28 formed between the shielding member 27 and the wall portion 211, on the one hand, it can shield the exhaust channel 28 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.

[0509] In some embodiments, reference Fig.26 , and please refer to Fig. 27 , Fig. 27 Schematic diagram of the connection between the protective patch 29 and the adhesive layer 30 provided in some embodiments of the present application. Along the thickness direction X of the wall, the side of the protective patch 29 facing the wall 211 is provided with an adhesive layer 30, and the adhesive layer 30 adheres the protective patch 29 and the wall 211. A first avoidance hole 301 is provided at the position of the adhesive layer 30 corresponding to the information collection hole 291, and along the thickness direction X of the wall, the projections of the information collection hole 291 and the exhaust port 283 are both located in the first avoidance hole 301.

[0510] The adhesive layer 30 serves to bond the protective patch 29 and the wall portion 211 . Exemplarily, the adhesive layer 30 may be glue or double-sided tape disposed between the protective patch 29 and the wall portion 211 .

[0511] Along the thickness direction X of the wall, the projections of the information collection hole 291 and the exhaust port 283 are both located within the first avoidance hole 301, that is, the area defined by the projection of the first avoidance hole 301 on a plane perpendicular to the thickness direction X of the wall covers the information collection hole 291 and the exhaust port 283, that is, the first avoidance hole 301 can avoid the information collection hole 291 and the exhaust port 283 in the thickness direction X of the wall.

[0512] For example, in Fig.26 In the figure, the exhaust channel 28 includes a third exhaust gap 281, and the third exhaust gap 281 is formed between the shielding member 27 and the groove side of the mounting groove 2113, and the exhaust port 283 is formed at one end of the third exhaust gap 281 connected to the outside of the shell 21, and correspondingly, the projection of the mounting groove 2113 and the shielding member 27 in the thickness direction X of the wall is located in the first avoidance hole 301, so that the first avoidance hole 301 can avoid the mounting groove 2113 and the shielding member 27, thereby avoiding the information collection hole 291 and the exhaust port 283.

[0513] Among them, the area defined by the projection of the first avoidance hole 301 in the thickness direction X of the wall covers the information collection hole 291 and the installation groove 2113. Since the projection of the information collection hole 291 in the thickness direction X of the wall is located in the shielding member 27, the area of ​​the first avoidance hole 301 is larger than the area of ​​the installation groove 2113, and the area of ​​the installation groove 2113 is larger than the area of ​​the information collection hole 291.

[0514] By providing an adhesive layer 30 on the side of the protective patch 29 facing the wall 211, the protective patch 29 can be bonded to the wall 211 through the adhesive layer 30, which is conducive to reducing the difficulty of assembling the protective patch 29 and improving the connection stability of the protective patch 29 set on the wall 211. In addition, by providing a first avoidance hole 301 at a position corresponding to the information collection hole 291 of the adhesive layer 30, and the projections of the information collection 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 are both located in the first avoidance hole 301, so as to reduce the blocking of the exhaust port 283 of the exhaust channel 28 by the adhesive layer 30, so that the gas discharged through the exhaust channel 28 can enter the information collection hole 291 through the gap between the protective patch 29 and the wall 211 and then be discharged, so that the protective patch 29 can be bonded to the wall 211 while reducing the impact on the exhaust of the one-way valve 23.

[0515] According to some embodiments of the present application, see Figure 3 , Figure 4 and Fig.26 As shown, an exhaust port 283 communicating with the outside of the shell 21 is formed at one end of the exhaust channel 28 , and the battery cell 20 also includes a protective patch 29 , which is arranged on the side of the wall 211 away from the electrode assembly 22 , and covers the exhaust port 283 .

[0516] 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 inside the protective patch 29 .

[0517] It should be noted that in an embodiment in which an adhesive layer 30 is provided on the side of the protective patch 29 facing the wall portion 211, and in an embodiment in which the information collection hole 291 is not provided corresponding to the shielding member 27, the adhesive layer 30 forms a channel for connecting the exhaust port 283 and the outside of the outer shell 21 to allow the gas inside the outer shell 21 to be discharged.

[0518] By providing a protective patch 29 on the side of the wall 211 away from the electrode assembly 22, and the protective patch 29 covers the exhaust port 283 at one end of the exhaust channel 28 formed between the shielding member 27 and the wall 211, on the one hand, it can shield the exhaust channel 28 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.

[0519] According to some embodiments of the present 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 mounted in the mounting hole 2111 . The mounting hole 2111 is a liquid injection hole for the battery cell 20 .

[0520] In the embodiment where the mounting hole 2111 is the injection hole of the battery cell 20 , before assembling the one-way valve 23 , liquid needs to be injected into the housing 21 through the injection hole, and then the one-way valve 23 is assembled into the mounting hole 2111 .

[0521] By setting the mounting hole 2111 for assembling the one-way valve 23 as an injection hole, liquid can be injected into the outer shell 21 through the mounting hole 2111 before the one-way valve 23 is assembled into the mounting hole 2111, thereby eliminating the need to open a separate injection hole on the outer shell 21, which is beneficial to improving the production efficiency of the battery cell 20 and reducing the manufacturing cost of the battery cell 20.

[0522] According to some embodiments of the present application, see Figure 3 and Figure 4 As shown, the housing 21 may include a shell 212 and an end cap 213. The shell 212 has an interior formed with an accommodation cavity having an opening 2121, and the accommodation cavity is used to accommodate the electrode assembly 22. The end cap 213 closes the opening 2121, and the end cap 213 is a wall portion 211.

[0523] The end cover 213 is the wall portion 211 , that is, the one-way valve 23 is disposed on the end cover 213 .

[0524] 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 be other structures. For example, the shell 212 includes a wall portion 211, that is, the one-way valve 23 is installed on a wall of the shell 212. The one-way valve 23 can be installed on the bottom wall of the shell 212 and the end cover 213, or it can be installed on the side wall of the shell 212 and the end cover 213 that are adjacent to and interconnected.

[0525] By setting the wall portion 211 of the outer shell 21 as the end cover 213 of the outer shell 21 for closing the opening 2121 of the shell 212, the battery cell 20 with such a structure is convenient for installing the one-way valve 23 on the end cover 213, which is conducive to reducing the difficulty of assembling the battery cell 20, so as to improve the production efficiency of the battery cell 20. Similarly, by setting the wall portion 211 of the outer shell 21 as a wall of the shell 212, the battery cell 20 with such a structure can reduce the influence of the stress generated when the end cover 213 and the shell 212 are connected to each other on the one-way valve 23, so as to alleviate the phenomenon of damage to the one-way valve 23, and thus can improve the stability and service life of the battery cell 20.

[0526] According to some embodiments of the present application, see Figure 3 and Figure 4 As shown, the battery cell 20 also includes a pressure relief mechanism 25, which is disposed on the housing 21. The pressure relief mechanism 25 is configured to actuate and release the internal pressure of the battery cell 20 when the battery cell 20 thermally runs away. The actuation pressure of the pressure relief mechanism 25 is greater than the opening pressure of the one-way valve 23.

[0527] The pressure relief mechanism 25 is disposed on the housing 21, and may be disposed on the end cover 213 or on the housing 212. Figure 4 In the embodiment, the pressure relief mechanism 25 is arranged on the end cover 213 .

[0528] 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 thermally runs away, that is, when thermal runaway occurs inside the battery cell 20, the pressure relief mechanism 25 can be actuated and opened to release the gas generated inside the battery cell 20 due to thermal runaway.

[0529] The actuation pressure of the pressure relief mechanism 25 is greater than the opening pressure of the one-way valve 23, that is, the pressure of the gas inside the shell 21 to open the pressure relief mechanism 25 is greater than the pressure of the gas inside the shell 21 to open the one-way valve 23. It should be noted that when the battery cell 20 has thermal runaway, the gas inside the shell 21 of the battery cell 20 will increase rapidly to open the pressure relief mechanism 25 for pressure relief, while the gas generated inside the shell 21 of the battery cell 20 during normal use can open the one-way valve 23 when it reaches a threshold, but cannot open the pressure relief mechanism 25.

[0530] Optionally, the pressure relief mechanism 25 can be an integral structure with the housing 21, or a separate structure. If the pressure relief mechanism 25 can be an integral structure with the housing 21, the pressure relief mechanism 25 is an area on the housing 21 where a weak structure is provided, such as an area where a notch is provided on the housing 21; if the pressure relief mechanism 25 can be a separate structure from the housing 21, 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 the figure, the pressure relief mechanism 25 and the shell 21 are separately arranged, and the pressure relief mechanism 25 is arranged on the end cover 213 of the shell 21. The pressure relief mechanism 25 can be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, a pressure relief valve or a safety valve.

[0531] For example, in Figure 4 In the embodiment, the electrode terminal 24 and the pressure relief mechanism 25 are both arranged on the end cover 213. The battery cell 20 adopting this structure can save the 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 arranged on different walls of the outer shell 21. The battery cell 20 adopting this structure can make the electrode terminal 24 of the battery cell 20 used for outputting or inputting electric energy and the pressure relief mechanism 25 used for releasing internal pressure stay away from each other to reduce the risk of using the battery cell 20. For example, the pressure relief mechanism 25 is arranged on the shell 212, and the electrode terminal 24 is arranged on the end cover 213.

[0532] By setting the opening pressure of the one-way valve 23 for exhaust to be lower than the actuating pressure of the pressure relief mechanism 25 for pressure relief, when gas is generated inside the outer shell 21 during normal use of the battery cell 20, it can be discharged to the outside of the outer shell 21 through the one-way valve 23, thereby alleviating the phenomenon that the pressure relief mechanism 25 actuates pressure relief in advance before the thermal runaway of the battery cell 20 due to the increase in internal air pressure of the battery cell 20, thereby effectively improving the use stability of the battery cell 20, thereby improving the service life and reliability of the battery cell 20.

[0533] 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, the one-way valve 23 and the pressure relief mechanism 25 are both disposed on the end cover 213. The battery cell 20 with such a structure is conducive to saving the space occupied by the battery cell 20, so as to improve the energy density of the battery cell 20.

[0534] 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 is disposed on the end cover 213, and the pressure relief mechanism 25 is disposed on the housing 212. The battery cell 20 adopting such a structure can reduce the mutual influence between the one-way valve 23 and the pressure relief mechanism 25, and can be applied to different use environments.

[0535] In some embodiments, the exhaust rate of the one-way valve 23 is smaller than the exhaust rate of the pressure relief mechanism 25 .

[0536] By setting the exhaust rate of the one-way valve 23 to be lower than the exhaust rate of the pressure relief mechanism 25, the phenomenon that the one-way valve 23 exhausts too quickly and the pressure relief mechanism 25 cannot be actuated to open can be alleviated when the battery cell 20 has thermal runaway. This allows the pressure relief mechanism 25 to actuate and stably discharge the internal pressure of the battery cell 20 when the battery cell 20 has thermal runaway, thereby helping to reduce the risk of fire and explosion of the battery cell 20 when the battery cell 20 has thermal runaway.

[0537] According to some embodiments of the present application, referring to Figure 4 , and please refer to Fig.28 , Fig.28 Schematic diagram of the partial structure of a battery cell provided for some embodiments of the present 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 the one-way valve 23 protrudes from the second surface 2114. The battery cell 20 also includes an electrode terminal 24 and a current collecting member 31. The electrode terminal 24 is installed on the wall portion 211. The electrode terminal 24 is used to output or input electrical energy of the battery cell 20. The current collecting member 31 connects the electrode terminal 24 and the electrode assembly 22. At least part of the current collecting member 31 is arranged between the wall portion 211 and the electrode assembly 22. The current collecting member 31 is provided with an avoidance groove 311, and the one-way valve 23 extends into the avoidance groove 311 along the thickness direction X of the wall portion.

[0538] The electrode terminal 24 is disposed on the wall portion 211 , and the electrode terminal 24 is used to be electrically connected to the tab 221 of the electrode assembly 22 to achieve input or output of electrical energy of the battery cell 20 .

[0539] The current collecting member 31 is disposed in the housing 21, and serves to connect the electrode terminal 24 with the tab 221 of the electrode assembly 22, so as to achieve electrical connection between the electrode terminal 24 and the electrode assembly 22. The current collecting member 31 can be made of various materials, such as copper, iron, steel or aluminum.

[0540] Exemplarily, the battery cell 20 is provided with two electrode terminals 24, and both electrode terminals 24 are installed on the wall 211, and the two electrode terminals 24 are respectively used to electrically connect to two pole ears 221 of opposite polarities of the electrode assembly 22 to realize the output or input of the positive and negative electrodes of the battery cell 20 respectively.

[0541] The current collecting component 31 is provided with an avoidance groove 311, and the one-way valve 23 extends into the avoidance groove 311 along the thickness direction X of the wall. That is, the current collecting component 31 is provided with the avoidance groove 311 at the position corresponding to the one-way valve 23, so that the part of the one-way valve 23 protruding from the second surface 2114 along the thickness direction X of the wall can be accommodated in the avoidance groove 311.

[0542] The battery cell 20 is also provided with an electrode terminal 24 for inputting or outputting the electric energy of the battery cell 20, and the current collecting member 31 connects the electrode assembly 22 and the electrode terminal 24, so that the connection difficulty between the electrode assembly 22 and the electrode terminal 24 can be reduced through the current collecting member 31. In addition, by providing the avoidance groove 311 on the current collecting member 31, and the one-way valve 23 extending into the avoidance groove 311 in the thickness direction X of the wall portion, on the one hand, the one-way valve 23 can be avoided by the current collecting member 31 through the avoidance groove 311, so as to reduce the interference between the current collecting member 31 and the one-way valve 23, and on the other hand, the space occupied by the one-way valve 23 and the current collecting member 31 inside the housing 21 can be saved, which is conducive to improving the energy density of the battery cell 20.

[0543] In some embodiments, the battery cell 20 is an alkali metal battery, such as a sodium metal battery, a lithium metal battery, etc. The alkali metal battery is used in conjunction with the one-way valve 23 to timely discharge the gas generated by the alkali metal battery during normal operation, thereby increasing the service life of the alkali metal battery.

[0544] According to some embodiments of the present application, the present application further provides a battery 100 , and the battery 100 includes a battery cell 20 of any of the above solutions.

[0545] Among them, see Figure 2 As shown, the battery 100 may further include a box body 10, and the battery cell 20 is accommodated in the box body 10. In some embodiments, the box body 10 may include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 cover each other, and the first box body 11 and the second box body 12 jointly define an assembly space for accommodating the battery cell 20.

[0546] Optionally, in Figure 2 In the embodiment, the second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure, and 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 jointly define an assembly space. Of course, the structure of the box body 10 is not limited thereto. In other embodiments, the first box body 11 and the second box body 12 may also 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.

[0547] Of course, the box body 10 formed by the first box body 11 and the second box body 12 can be in various shapes, such as a cylinder or a cuboid. Figure 2 In the embodiment, the box body 10 is a rectangular parallelepiped structure.

[0548] In some embodiments, the battery cell 20 disposed in the box body 10 may be one or more. Figure 2 In the embodiment, a plurality of battery cells 20 are arranged in the box 10 of the battery 100, and the plurality of battery cells 20 can be connected in series, in parallel or in a mixed connection. The mixed connection means that the plurality of battery cells 20 are both connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series, in parallel or in a mixed connection, and then the whole formed by the plurality of battery cells 20 is accommodated in the box 10; of course, the battery 100 can also be a battery module formed by first connecting the plurality of battery cells 20 in series, in parallel or in a mixed connection, and then the plurality of battery modules are connected in series, in parallel or in a mixed connection to form a whole, and then accommodated in the box 10.

[0549] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component, which connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0550] It should be noted that, in some embodiments, the battery 100 may not be provided with a box 10, and the battery 100 includes a plurality of battery cells 20, and the battery 100 composed of a plurality of battery cells 20 may be directly assembled on an electrical device to provide electrical energy to the electrical device through the plurality of battery cells 20. In other words, the box 10 may be used as a part of the electrical device. Taking the vehicle 1000 as an example of the electrical device, the box 10 may be used as a part of the chassis structure of the vehicle 1000, for example, a part of the box 10 may become at least a part of the floor of the vehicle 1000, or a part of the box 10 may become at least a part of the crossbeam and longitudinal beam of the vehicle 1000.

[0551] According to some embodiments of the present application, the present application further provides an electrical device, which includes a battery cell 20 according to any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0552] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 .

[0553] According to some embodiments of the present application, see Figures 3 to 8 , Figure 16 to Figure 17 , Figure 20 to Figure 22 as well as Figure 25 to Figure 27As shown, the present application provides a battery cell 20, which includes a shell 21, an electrode assembly 22, a one-way valve 23, an insulating member 26, a shielding member 27, a protective patch 29 and a pressure relief mechanism 25. The shell 21 has a wall portion 211, and the shell 21 includes a shell 212 and an end cover 213. The inside of the shell 212 forms a receiving cavity with an opening 2121, and the electrode assembly 22 is received in the receiving cavity. The end cover 213 closes the opening 2121, and the end cover 213 is the wall portion 211. Along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2112 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 the gas inside the shell 21. The one-way valve 23 includes a valve body 231 and a valve core 232. The valve body 231 includes a valve main body 2314 and a valve cover 2315. The valve main body 2314 is arranged in the mounting hole 2111 and protrudes from the second surface 2114. The valve main body 2314 is provided with an air inlet 2312 at one end close to 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 main body 2314 away from the electrode assembly 22. The valve cover 2315 is provided with an air outlet 2313. The valve cover 2315 and the valve main body 2314 together enclose 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 recess 2314a is provided at one end of the valve body 2314 which faces away from the electrode assembly 22, and the valve cover 2315 is accommodated in the recess 2314a, and the valve cover 2315 does not extend beyond the end of the valve body 2314 which faces away from the electrode assembly 22. The valve core 232 includes an elastic member 2321 and a blocking member 2322, wherein the elastic member 2321 is a spring, and the blocking member 2322 is movably provided between the valve cover 2315 and the bottom surface of the installation cavity 2311 along the thickness direction X of the wall, and both ends of the elastic member 2321 in the thickness direction X of the wall are respectively abutted against the blocking member 2322 and the valve cover 2315, and the blocking member 2322 is used to block the air inlet 2312 under the action of the elastic member 2321, and is used to open the air inlet 2312 under the action of the gas inside the shell 21. A first guide column 2315b is convexly provided on one side of the valve cover 2315 facing the blocking member 2322. A portion of the elastic member 2321 is sleeved on the outer side of the first guide column 2315b. The diameter of the first guide column 2315b is D 1 , the inner diameter of the elastic member 2321 is D 2 , meet, 0mm<D 2 -D 1≤5mm. The blocking member 2322 includes a pressing portion 2322a and a sealing portion 2322b. Along the thickness direction X of the wall, the two ends of the elastic member 2321 respectively abut against the valve cover 2315 and the pressing portion 2322a. The sealing portion 2322b is connected to the side of the pressing portion 2322a facing away from the valve cover 2315. The sealing portion 2322b is used to block the air inlet 2312. A second guide column 2322c is convexly provided on the side of the pressing portion 2322a facing the valve cover 2315. Part of the elastic member 2321 is sleeved on the outside of the second guide column 2322c. The diameter of the second guide column 2322c is D 3 , the inner diameter of the elastic member 2321 is D 2 , meet, 0mm<D 3 -D 1≤5mm. The pressing portion 2322a has a first abutting surface 2322f facing the sealing portion 2322b, and the sealing portion 2322b has a second abutting surface 2322g facing the pressing portion 2322a. The first abutting surface 2322f is provided with a clamping groove 2322h, and the second abutting surface 2322g is convexly provided with a clamping portion 2322k, and the clamping portion 2322k is clamped and matched with the clamping groove 2322h. Along the thickness direction X of the wall portion, the distance between the first guide column 2315b and the second guide column 2322c is L, which satisfies 0mm<L≤2mm. The mounting hole 2111 includes a first hole section 2111b and a second hole section 2111c. The first hole section 2111b and the second hole section 2111c are arranged along the thickness direction X of the wall portion, and the first hole section 2111b is located on the side of the second hole section 2111c away from the electrode assembly 22, and the aperture of the first hole section 2111b is larger than the aperture of the second hole section 2111c. The hole wall surface of the first hole section 2111b is the first connecting surface 2111a, the valve body 231 has a connecting portion 2314c located in the first hole section 2111b, and the outer peripheral surface of the connecting portion 2314c is the 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, and the first connecting surface 2111a is welded to the second connecting surface 2314b. The first connection surface 2111a is matched with the second connection surface 2314b, and the first connection surface 2111a and the second connection surface 2314b are both arranged at an acute angle with 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 arranged on the side of the wall portion 211 facing the electrode assembly 22. The receiving portion 262 is connected to the body portion 261. The portion of the one-way valve 23 extending to the inside of 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 is arranged around 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 one end of the first wall 2622 away from the body portion 261. The second wall 2623 is provided with a second through hole 2621, and the second through hole 2621 communicates with the inside 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 mounting 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. The shielding member 27 covers the one-way valve 23. An exhaust channel 28 is formed between the shielding member 27 and the wall portion 211. The exhaust channel 28 communicates with the gas outlet 2313 and the outside of the housing 21. The exhaust channel 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 groove side of the mounting groove 2113.The cross-section of the shielding member 27 and the mounting groove 2113 in the thickness direction X perpendicular to the wall is rectangular, the outer peripheral surface of the shielding member 27 includes four first corner surfaces 271 and four first side surfaces 272, each two 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 two adjacent second side surfaces 2113b are connected by a second corner surface 2113a, each first side surface 272 and the corresponding second side surface 2113b are mutually abutted and welded, and a third exhaust gap 281 is formed between each first corner surface 271 and the corresponding second corner surface 2113a. The first corner surface 271 and the second corner surface 2113a are both arc surfaces, and the radius of the first corner surface 271 is greater 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 away from the one-way valve 23. The third surface 275 overlaps the bottom surface of the installation 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, and the first groove 2751 extends along the radial direction of the shielding member 27 and penetrates a first corner surface 271. The bottom surface of the first groove 2751 and the bottom surface of the groove of the installation groove 2113 form a fourth exhaust gap 282. The third surface 275 is also provided with a second groove 2752. Multiple first grooves 2751 are arranged around the second groove 2752 and are all connected to the second groove 2752. The second groove 2752 is connected to the gas outlet 2313. Along the thickness direction X of the wall, the air outlet 2313 is arranged facing the second groove 2752, and the projection of the air outlet 2313 is located in the second groove 2752. The protective patch 29 is arranged on the side of the wall 211 away from the electrode assembly 22, and the protective patch 29 is provided with an information collection hole 291 penetrating the protective patch 29, and the projection of the information collection hole 291 in the thickness direction X of the wall is located in the shielding member 27. An exhaust port 283 connected to the outside of the housing 21 is formed at one end of the exhaust channel 28, and the protective patch 29 covers the exhaust port 283 along the thickness direction X of the wall. An adhesive layer 30 is provided on the side of the protective patch 29 facing the wall 211, and the adhesive layer 30 adheres the protective patch 29 and the wall 211, and a first avoidance hole 301 is provided at the position of the adhesive layer 30 corresponding to the information collection hole 291, and the projections of the mounting groove 2113 and the shielding member 27 along the thickness direction X of the wall are both located in the first avoidance hole 301. The pressure relief mechanism 25 is disposed on the wall portion 211 , and is configured to actuate and release the internal pressure of the battery cell 20 when the battery cell 20 thermally runs away. 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 .

[0554] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0555] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: a housing having a wall portion; an electrode assembly, contained in the housing; as well as A one-way valve is arranged on the wall portion, and the one-way valve is used to discharge the gas inside the shell.

2. The battery cell according to claim 1, characterized in that: The one-way valve comprises: a valve body, arranged on the wall portion, wherein a mounting cavity is formed inside the valve body, and an air inlet and an air outlet are arranged on the valve body, wherein the air inlet is used to communicate the mounting cavity with the interior of the shell, and the air outlet is used to communicate the mounting cavity with the exterior of the shell; A valve core is arranged 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 the gas inside the shell.

3. The battery cell according to claim 2, characterized in that: The valve body comprises: A valve body, disposed on the wall portion, wherein the valve body is provided with the air inlet; A valve cover is provided at an 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 are jointly enclosed to form the installation 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 arranged on the valve cover.

5. The battery cell according to claim 3 or 4, characterized in that: The valve cover is connected to the valve body, and the air outlet is a first exhaust gap formed between the valve cover and the valve body.

6. The battery cell according to any one of claims 3 to 5, characterized in that: The valve cover is connected to the valve body. A sink 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 sink.

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 an end of the valve body away from the electrode assembly.

8. The battery cell according to claim 7, characterized in that: The wall portion has a first surface facing away from the electrode assembly along a thickness direction of the wall portion, 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 any one of claims 3 to 9, characterized in that: The valve body and the wall portion are integrally formed.

11. The battery cell according to any one of claims 3 to 10, characterized in that: The valve core comprises: An elastic member, disposed in the installation cavity; A blocking member is movably disposed in the installation cavity, and is used to block the air inlet under the action of the elastic member, and is used to open the air inlet under the action of the gas inside the shell.

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

13. The battery cell according to claim 11 or 12, characterized in that: The elastic member is made of steel, iron or aluminum.

14. The battery cell according to any one of claims 11 to 13, characterized in that: Along the thickness direction of the wall portion, the valve cover and the blocking member are spaced apart, two ends of the elastic member are respectively against the valve cover and the blocking member, and the air inlet is arranged on the bottom surface of the installation cavity.

15. The battery cell according to claim 14, characterized in that: A first guide column is protrudingly provided on one side of the valve cover facing the blocking member, and a portion of the elastic member is sleeved on the outer side of the first guide column.

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 column; or Along the radial direction of the first guide column, the air outlet and the first guide column are arranged at intervals.

17. The battery cell according to claim 15 or 16, characterized in that: The diameter of the first guide column is D1, and the inner diameter of the elastic member is D2, which satisfies the condition that 0mm<D2-D1≤5mm.

18. The battery cell according to any one of claims 14 to 17, characterized in that: A first limiting groove is provided on a side of the valve cover facing the blocking member, and an end of the elastic member away from the blocking member is inserted into the first limiting groove.

19. The battery cell according to any one of claims 14 to 18, characterized in that: One end of the elastic member away from the blocking member is fixedly connected to the valve cover.

20. The battery cell according to any one of claims 14 to 19, characterized in that: A second guide column is protrudingly provided on one side of the blocking member facing the valve cover, and a portion of the elastic member is sleeved on the outer side of the second guide column.

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

22. The battery cell according to any one of claims 14 to 21, characterized in that: A second limiting groove is provided on a side of the blocking member facing the valve cover, and an end of the elastic member away from the valve cover is inserted into the second limiting groove.

23. The battery cell according to any one of claims 14 to 22, characterized in that: One end of the elastic member away from the valve cover is fixedly connected to the blocking member.

24. The battery cell according to any one of claims 14 to 23, characterized in that: The blocking member is spaced apart from a side surface of the installation cavity.

25. The battery cell according to any one of claims 14 to 23, characterized in that: A plurality of limiting protrusions are convexly provided on the outer circumferential surface of the blocking member, and the plurality of limiting protrusions are arranged at intervals along the circumferential direction of the blocking member, and the limiting protrusions are matched with the side surfaces of the installation cavity for guiding.

26. The battery cell according to any one of claims 14 to 25, characterized in that: The sealing member includes a pressing portion and a sealing portion. Along the thickness direction of the wall portion, two ends of the elastic member respectively abut against the valve cover and the pressing portion. The sealing portion is connected to a side of the pressing portion away from the valve cover, and the sealing portion is used to seal the air inlet.

27. The battery cell according to claim 26, characterized in that: The clamping portion has a first abutting surface facing the sealing portion, and the sealing portion has a second abutting surface facing the clamping portion. One of the first abutting surface and the second abutting surface is provided with a snap-fitting groove, and the other is provided with a snap-fitting portion, and the snap-fitting portion is snap-fitted with the snap-fitting groove.

28. The battery cell according to claim 26 or 27, characterized in that: The sealing portion is bonded to the pressing portion.

29. The battery cell according to any one of claims 26 to 28, characterized in that: The sealing part is made of EPDM, fluororubber or Teflon.

30. The battery cell according to any one of claims 14 to 29, characterized in that: Along the thickness direction of the wall portion, a size of a gap between the valve cover and the blocking member is L, which satisfies 0mm<L≤2mm.

31. The battery cell according to any one of claims 3 to 30, characterized in that: The valve body is connected to the wall portion by welding.

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

33. The battery cell according to claim 32, characterized in that: The first connection surface matches the second connection surface, and both the first connection surface and the second connection surface are arranged 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 comprises 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 a side of the second hole segment away from the electrode assembly, and the aperture of the first hole segment is larger than the aperture of the second hole segment; 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.

35. The battery cell according to any one of claims 32 to 34, characterized in that: Along the thickness direction of the wall portion, an end surface of the valve body away from the electrode assembly is connected to the second connection surface, and a first stress release groove is provided on the end surface of the valve body away from the electrode assembly.

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

37. The battery cell according to any one of claims 1 to 36, characterized in that: The battery cell further comprises: an insulating member, disposed on a side of the wall portion facing the electrode assembly; Among them, 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 main body portion and a accommodating portion, the main body portion is arranged on the side of the wall portion facing the electrode assembly, the accommodating portion is connected to the main body portion, and the part of the one-way valve extending to the inside of the outer shell is accommodated in the accommodating portion.

38. The battery cell according to claim 37, characterized in that: The one-way valve comprises a valve body, the valve body protrudes from the second surface along the thickness direction of the wall portion, and a 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 accommodating portion is provided with a second through hole, and the second through hole is communicated with 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 arranged at one end of the valve body facing the electrode assembly; The accommodating portion includes a first wall and a second wall, wherein the first wall is disposed around the valve body, and along the thickness direction of the wall, one end of the first wall is connected to the main body, and the second wall is connected to one end of the first wall away from the main body; Wherein, the second through hole is arranged on the first wall and / or the second wall.

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

41. The battery cell according to claim 39, characterized in that The accommodating portion is separately arranged from the main body portion.

42. The battery cell according to claim 41, characterized in that The receiving portion further comprises: The flange portion is connected to one end of the first wall away from the second wall, at least part of the flange portion is stacked with the main body portion, and the flange portion abuts against a side of the main 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, a 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, a surface of the flange portion facing the wall portion is flush with a surface of the body portion facing the wall portion.

45. The battery cell according to any one of claims 1 to 44, characterized in that: The battery cell further comprises: a shielding member installed on the wall portion, and along the thickness direction of the wall portion, the shielding member is located on a 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 air outlet, which is used to discharge the gas inside the shell, and an exhaust channel is formed between the shielding member and the wall portion or the shielding member is provided with an exhaust channel, and the exhaust channel connects the air outlet and the outside of the shell.

46. ​​The battery cell according to claim 45, 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 arranged in the mounting hole, and at least a portion of the shielding member is accommodated in the mounting groove.

47. The battery cell according to claim 46, characterized in that The exhaust passage includes a third exhaust gap formed between the shielding member and a groove side surface of the mounting groove, and the third exhaust gap is used to communicate the air outlet with the outside of the housing.

48. The battery cell according to claim 47, 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 groove side surface of the mounting groove includes a second corner surface and at least two second side surfaces, the second corner surface connects two adjacent second side surfaces, each second side surface is connected to one first side surface, and the third exhaust gap is formed between the second corner surface and the first corner surface.

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

50. The battery cell according to claim 48 or 49, characterized in that: The first side surface is connected to the second side surface by welding.

51. The battery cell according to any one of claims 48 to 50, characterized in that: The cross section of the shielding member in a direction perpendicular to the thickness of the wall portion is rectangular, the outer peripheral surface of the shielding member includes four first side surfaces and four first corner surfaces, and the third exhaust gap is formed at at least one first corner surface.

52. The battery cell according to any one of claims 47 to 51, characterized in that: The exhaust channel further includes a fourth exhaust gap, which is formed between the shielding member and the bottom surface of the mounting groove, and the fourth exhaust gap communicates with the third exhaust gap and the air outlet.

53. The battery cell according to claim 52, 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 overlaps the bottom surface of the mounting groove, the third surface is provided with a first groove, and the fourth exhaust gap is formed between the bottom surface of the first groove and the bottom surface of the mounting groove.

54. The battery cell according to claim 53, characterized in that A plurality of the third exhaust gaps are formed between the shielding member and the groove side surface of the mounting groove, and the plurality of the third exhaust gaps are arranged at intervals along the circumference of the shielding member. A plurality of the first grooves are arranged on the third surface, and each of the third exhaust gaps is connected to one of the first grooves.

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

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

57. The battery cell according to any one of claims 46 to 56, characterized in that: Along the thickness direction of the wall portion, the shielding member does not extend beyond the first surface.

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

59. The battery cell according to any one of claims 45 to 58, characterized in that: The shielding member is fixedly connected to the wall portion.

60. The battery cell according to any one of claims 45 to 59, characterized in that: The battery cell further comprises: A protective patch is arranged on a side of the wall portion away from the electrode assembly, and an information collection hole penetrating the protective patch is arranged on the protective patch, and a projection of the information collection hole in the thickness direction of the wall portion is located within the shielding member.

61. The battery cell according to claim 60, characterized in that An exhaust port communicating with the outside of the housing is formed at one end of the exhaust passage, and the protective patch covers the exhaust port.

62. The battery cell according to claim 61, characterized in that A bonding layer is provided on a side of the protective patch facing the wall portion, and the bonding layer bonds the protective patch and the wall portion; Wherein, a first avoidance hole is arranged at a position of the adhesive layer corresponding to the information collection hole, and along the thickness direction of the wall portion, projections of the information collection hole and the exhaust port are both located within the first avoidance hole.

63. The battery cell according to any one of claims 45 to 62, characterized in that: An exhaust port communicating with the outside of the housing is formed at one end of the exhaust passage; The battery cell further includes a protective patch, which is disposed on a side of the wall portion away from the electrode assembly, and covers the exhaust port.

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

65. The battery cell according to any one of claims 1 to 64, characterized in that: The housing comprises: A shell body, wherein a receiving cavity with an opening is formed inside, and the receiving cavity is used to receive the electrode assembly; an end cap for closing the opening; Wherein, the end cover is the wall portion; or The housing includes the wall portion.

66. The battery cell according to any one of claims 1 to 65, characterized in that: The battery cell further comprises: A pressure relief mechanism is provided on the housing, and is configured to actuate and release the internal pressure of the battery cell when the battery cell is in thermal runaway, and the actuation pressure of the pressure relief mechanism is greater than the opening pressure of the one-way valve.

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

68. The battery cell according to any one of claims 1 to 67, 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 an electrode terminal and a current collecting member, wherein the electrode terminal is mounted on the wall portion, the electrode terminal is used to output or input electric energy of the battery cell, the current collecting member connects the electrode terminal and the electrode assembly, and at least a portion of the current collecting member is disposed between the wall portion and the electrode assembly; Wherein, the current collecting component is provided with an avoidance groove, and the one-way valve extends into the avoidance groove along the thickness direction of the wall portion.

69. A battery, characterized in that: Comprising a battery cell as described in any one of claims 1-68.

70. An electrical device, characterized in that: The invention comprises a battery cell as described in any one of claims 1 to 68, wherein the battery cell is used to provide electrical energy.

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