Battery cell, battery, and electrical device

Abstract

The present application relates to the technical field of batteries, and provides a battery cell, a battery, and an electrical device. The battery cell comprises an outer housing, an electrode assembly, and a one-way valve. The outer housing is provided with a wall portion, the electrode assembly is accommodated in the outer housing, the one-way valve is provided on the wall portion, and the one-way valve is used for discharging gas at the interior of the outer housing. By means of providing the one-way valve on the wall portion of the outer housing, the one-way valve can be opened in one direction and the gas at the interior of the outer housing can be discharged out of the outer housing. Therefore, when gas is generated in the outer housing during normal use of the battery cell, the gas can be discharged to the outside of the outer housing by means of the one-way valve, so as to alleviate the phenomenon of the internal pressure of the battery cell reaching a threshold early due to an increase in the internal air pressure of the battery cell, thus the use stability of the battery cell can be effectively increased, thereby increasing the service life and reliability of the battery cell.

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 2023107208122, filed on June 16, 2023, entitled “Battery Cell, Battery and Electrical Device,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] 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

[0004] In recent years, new energy vehicles have experienced rapid development. In the electric vehicle sector, 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. As a core component of new energy vehicles, batteries have high requirements in terms of reliability and service life.

[0005] In battery technology, to ensure the safety of battery cells, a pressure relief mechanism is typically installed on the outer casing of the battery cell to release internal pressure. This mechanism activates and releases pressure when the internal pressure or temperature of the battery cell reaches a threshold. However, existing pressure relief mechanisms in battery cells can prematurely activate during use, resulting in poor stability and hindering the lifespan and reliability of the battery cell.

[0006] Summary of the Invention

[0007] 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.

[0008] 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 gas inside the shell.

[0009] In the above technical solution, a one-way valve is provided on the wall of the shell so that the one-way valve can be opened in one direction and the gas inside the shell can be discharged to the outside of the shell. Therefore, 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 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 and improving the service life and reliability of the battery cell.

[0010] 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 provided on the valve body, the air inlet is used to connect the installation cavity and the interior of the outer shell, and the air outlet is used to connect the installation cavity and the outside of the outer shell; the valve core is arranged in the installation cavity, the valve core is used to seal the air inlet, and is used to open the air inlet under the action of the gas inside the outer shell.

[0011] 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, 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.

[0012] 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.

[0013] 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 in the thickness direction of the wall away from the electrode assembly, 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 is divided into two parts, which facilitates the assembly of the valve core into the installation cavity, which helps to reduce the difficulty of assembling the one-way valve.

[0014] 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.

[0015] 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 shell through the first through hole provided on the valve cover. The valve body adopting this 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.

[0016] 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.

[0017] 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.

[0018] In some embodiments, the valve cover is connected to the valve body, and a sink is provided at one end of the valve body facing away from the electrode assembly, and at least a portion of the valve cover is accommodated in the sink.

[0019] In the above technical solution, a recess is provided on the end of the valve body facing 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, on the one hand, save the space occupied by the valve body in the thickness direction of the wall, and on the other hand, improve the structural stability of the valve cover assembled on the valve body, and can play a certain protective role on the valve cover to reduce wear or damage to the valve cover.

[0020] In some embodiments, along a thickness direction of the wall portion, the valve cover does not extend beyond an end of the valve body facing away from the electrode assembly.

[0021] In the above technical solution, by setting the valve cover in the thickness direction of the wall so as not to exceed the end of the valve body away from the electrode assembly, the valve cover is located as a whole in the sink, 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.

[0022] 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.

[0023] In the above technical solution, the valve body of the valve body is set to not 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 collision between the valve body and the external environment, which is beneficial to improve the protection of the valve body and thus increase the service life of the one-way valve.

[0024] 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.

[0025] In the above technical solution, by connecting the valve cover to the wall, and the air outlet of the valve body is a second exhaust gap arranged between the valve cover and the wall, 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, which is beneficial to reduce the phenomenon that the air outlet is blocked by other components of the battery cell.

[0026] In some embodiments, the valve body and the wall portion are integrally formed.

[0027] 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.

[0028] 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 to open the air inlet under the action of the gas inside the shell.

[0029] 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.

[0030] In some embodiments, the elastic member is a spring.

[0031] In the above technical solution, a spring is used as the elastic part arranged in the installation cavity. On the one hand, it is convenient to assemble the elastic part, which is conducive to reducing the difficulty of assembling the elastic part in the installation cavity. On the other hand, it can achieve a more stable direction in which the elastic part applies elastic force to the sealing part.

[0032] In some embodiments, the elastic member is made of steel, iron, or aluminum.

[0033] 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.

[0034] In some embodiments, the valve cover and the blocking member are spaced apart along the thickness direction of the wall portion, two ends of the elastic member respectively abut against the valve cover and the blocking member, and the air inlet is arranged on the bottom surface of the installation cavity.

[0035] In the above technical solution, the valve cover and the sealing member are arranged in a structure spaced apart in 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 convenient 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.

[0036] In some embodiments, a first guide column is protruded from 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.

[0037] 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 adopting 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, thereby enabling the elastic member to be stably compressed along the thickness direction of the wall portion, which is beneficial to improving the reliability of the elastic member and further reducing the risk of the sealing member accidentally opening the air inlet.

[0038] In some embodiments, the valve cover is connected to the valve body, and the air outlet is a first through hole provided on the valve cover; wherein, along the thickness direction of the wall portion, the air outlet 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.

[0039] In the above technical solution, by configuring the air outlet as a first through-hole formed in the valve cover, and by allowing the first through-hole to penetrate the first guide post along the thickness direction of the wall portion, the air outlet is located on the inner side of the elastic member, thereby reducing the interference caused by the air outlet on the connection between the valve cover and the valve body. Similarly, by configuring the air outlet as the first through-hole formed in the valve cover, and by allowing the air outlet to be located on the outer side of the first guide post, gas discharge is facilitated, thereby reducing the phenomenon of the air outlet being blocked by the blocking member.

[0040] In some embodiments, the diameter of the first guide column is D1, and the inner diameter of the elastic member is D2, satisfying 0mm<D2-D1≤5mm.

[0041] In the above technical solution, 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, it can alleviate 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, so as to reduce the scratching phenomenon in the process of the elastic part being put on the first guide post; on the other hand, it can alleviate 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, 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.

[0042] 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.

[0043] 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 conducive to improving the reliability of the elastic member.

[0044] In some embodiments, one end of the elastic member away from the blocking member is fixedly connected to the valve cover.

[0045] In the above technical solution, by fixing 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.

[0046] In some embodiments, a second guide column is protruded from 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.

[0047] 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 outside of the second guide column. The one-way valve adopting this structure can, on the one hand, play a certain positioning role on 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, so as to reduce the radial deformation of the elastic member during the compression process, thereby enabling the elastic member to be stably compressed along the thickness direction of the wall, which is beneficial to improving the reliability of the elastic member, and further reducing the risk of the sealing member accidentally opening the air inlet.

[0048] In some embodiments, the diameter of the second guide column is D3, and the inner diameter of the elastic member is D2, satisfying 0mm<D3-D1≤5mm.

[0049] In the above technical solution, 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, it can alleviate the phenomenon that the elastic part is not convenient 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, so as to reduce the scratching phenomenon in the process of the elastic part being put on the second guide post; on the other hand, it can alleviate 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, 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.

[0050] 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.

[0051] 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, thereby limiting the end of the elastic member resting on the sealing member, thereby reducing the relative radial slippage between the elastic member and the sealing member, and further 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 elastic member.

[0052] In some embodiments, one end of the elastic member away from the valve cover is fixedly connected to the blocking member.

[0053] In the above technical solution, by fixing one end of the elastic member away from the valve cover to the blocking member, the end of the elastic member resting on the blocking member and the blocking member are fixedly connected to each other, thereby improving the stability of the elastic member resting on the blocking member, further reducing the relative slippage between the elastic member and the blocking member, and further improving the balance of the elastic force of the elastic member acting on the blocking member.

[0054] In some embodiments, the blocking member is spaced apart from a side surface of the installation cavity.

[0055] 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 blocking piece from getting stuck or moving unsmoothly, which is beneficial to improving the reliability of the one-way valve.

[0056] In some embodiments, a plurality of limiting protrusions are 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 are guided and matched with the side surfaces of the installation cavity.

[0057] In the above technical solution, a plurality of spaced 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 guidance. 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 guide and limit the blocking piece, thereby improving the stability of the blocking piece in moving along the thickness direction of the wall.

[0058] In some embodiments, the sealing member includes a pressing 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 pressing portion. The sealing portion is connected to the side of the pressing portion away from the valve cover, and the sealing portion is used to seal the air inlet.

[0059] In the above technical solution, the sealing member is provided to include a pressing portion and a sealing portion, the pressing portion is provided 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.

[0060] 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-fit ​​groove, and the other is provided with a snap-fit ​​portion, and the snap-fit ​​portion is snap-fitted with the snap-fit ​​groove.

[0061] 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. By providing a snap-fit ​​groove on one of the first abutting surface and the second abutting surface, a snap-fit ​​portion that is snap-fitted 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 helping to improve the sealing effect of the sealing portion on the air inlet, thereby reducing the phenomenon of the air inlet being accidentally opened.

[0062] In some embodiments, the sealing portion is bonded to the pressing portion.

[0063] 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 sealing the air inlet. On the other hand, it is convenient 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.

[0064] In some embodiments, the sealing portion is made of EPDM, fluororubber or Teflon.

[0065] In the above technical solution, the sealing part is made of EPDM, fluororubber or Teflon, which makes the sealing part have better corrosion resistance and 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 reduce the phenomenon of the sealing part not being able to seal the air inlet effectively due to the corrosion of the sealing part.

[0066] In some embodiments, along the thickness direction of the wall portion, a size of the gap between the valve cover and the blocking member is L, which satisfies 0 mm < L ≤ 2 mm.

[0067] In the above technical solution, by setting the size of the gap between the valve cover and the blocking 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 blocking piece can be reduced, so that there is space between the valve cover and the blocking piece for the blocking piece to move along the thickness direction of the wall, so that when the gas inside the shell pushes the blocking piece, the blocking 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 blocking piece, which is beneficial to improving the space utilization rate of the battery cell.

[0068] In some embodiments, the valve body is connected to the wall portion by welding.

[0069] 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.

[0070] 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.

[0071] In the above technical solution, a mounting hole for accommodating the valve body of the valve body is provided on the wall portion, and the valve body has a second connecting surface, which is welded to the first connecting surface of the hole wall 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 both arranged in an annular shape and are welded to each other can, on the one hand, improve the connection reliability between the valve body and the wall portion, and on the other hand, improve the sealing effect between the valve body and the hole wall of the mounting hole.

[0072] In some embodiments, the first connecting surface matches the second connecting surface, and both the first connecting surface and the second connecting surface are arranged at an acute angle to the central axis of the mounting hole.

[0073] 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, the first connecting surface and the second connecting surface are conveniently abutted 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 gaps 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.

[0074] 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 aperture of the first hole segment is larger than the aperture 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.

[0075] In the above technical solution, 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 outside 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 having a connecting portion accommodated in the first hole section, 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 one-way valve from the outside 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.

[0076] 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 relief groove is provided on the end surface of the valve body facing away from the electrode assembly.

[0077] 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.

[0078] In some embodiments, the first stress relief groove is arranged around the central axis of the mounting hole.

[0079] 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 improve 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 impact of the welding stress on other components such as the valve core of the one-way valve.

[0080] In some embodiments, the battery cell further comprises 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 comprises 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 portion of the one-way valve extending to the inside of the shell is received in the receiving portion.

[0081] 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 interconnected. 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 accommodates the part of the one-way valve protruding from the second surface of the wall portion, which can 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.

[0082] 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 be discharged; wherein the accommodating portion is provided with a second through hole, and the second through hole is connected to the air inlet.

[0083] In the above technical solution, a second through hole is provided on the accommodating portion so that the second through hole can communicate with the interior of the shell and the interior of the accommodating portion, so that the air inlet of the valve body of the one-way valve can be communicated 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, thereby eliminating the need for the gas to enter the accommodating portion through the gap between the main body and the wall and then be discharged through the one-way valve, which is beneficial to improving the smoothness of the one-way valve in discharging the gas inside the shell.

[0084] 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.

[0085] In the above technical solution, the accommodating portion is provided with a first wall and a second wall 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, 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 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 shell.

[0086] In some embodiments, the receiving portion is integrally formed with the main body portion.

[0087] In the above technical solution, the main body and the accommodating portion of the insulating member are provided as an integrally formed structure, thereby facilitating improvement of the structural strength and structural stability of the accommodating portion connected to the main body.

[0088] In some embodiments, the receiving portion is separately provided from the main body portion.

[0089] In the above technical solution, by providing the main body and the accommodating portion of the insulating member as separate structures, it is helpful to reduce the difficulty of processing the insulating member and thus reduce the manufacturing cost of the insulating member.

[0090] In some embodiments, the accommodating portion further 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 the side of the main body portion facing the wall portion.

[0091] In the above technical solution, the accommodating portion is also provided with a flange portion. By connecting the flange portion 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 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. The structure is simple and easy to assemble.

[0092] 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.

[0093] In the above technical solution, by providing a receiving 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 portion 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 portion and the wall portion can be reduced.

[0094] 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.

[0095] 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.

[0096] In some embodiments, the battery cell further includes a shielding member; the shielding member is mounted on the wall portion, and along the thickness direction of the wall portion, the shielding member is located on the side of the one-way valve away from the electrode assembly, and the shielding member covers the one-way valve; wherein, the one-way valve has an air outlet, and the air 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 air outlet and the outside of the outer shell.

[0097] 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, 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 improving 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 on the connection detection element and other components.

[0098] 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 provided in the mounting hole, and at least a portion of the shielding member is accommodated in the mounting groove.

[0099] In the above technical solution, by arranging a mounting groove on the first surface of the wall portion facing 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 on the shielding member, which is beneficial to reducing the difficulty of assembling the shielding member connected to the wall portion.

[0100] In some embodiments, the exhaust channel 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 connect the air outlet and the outside of the housing.

[0101] 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 using this structure does not need to have a channel opened on the shielding member, which is conducive to reducing processing difficulty and improving the appearance of the battery cell.

[0102] 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.

[0103] 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. 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, which is beneficial to improve the firmness of the shielding member connected to the wall.

[0104] In some embodiments, 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.

[0105] 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.

[0106] In some embodiments, the first side surface is connected to the second side surface by welding.

[0107] 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, thereby improving the structural stability of the shielding member assembled to the wall.

[0108] 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.

[0109] In the above technical solution, by setting the shielding member as a rectangular plate structure, the four sides of the shielding member form four first side surfaces, and four first corner surfaces are formed at the four right angles of the shielding member, the structure is simple and easy to manufacture.

[0110] In some embodiments, the exhaust channel further includes a fourth exhaust gap 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.

[0111] 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.

[0112] 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, and 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.

[0113] 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, thereby improving 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 air 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, thereby achieving the shielding member against the bottom surface of the mounting groove and at the same time enabling the third exhaust gap to be connected with the air outlet through the first groove.

[0114] 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.

[0115] In the above technical solution, a plurality of third exhaust gaps are formed between the shielding member and the groove side surface of the installation groove, and each third exhaust gap is connected to a first groove, thereby facilitating further improving the exhaust efficiency.

[0116] In some embodiments, the third surface is further provided with a second groove, a plurality of the first grooves are provided around the second groove and are all connected to the second groove, and the second groove is connected to the air outlet.

[0117] 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 all 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 pass through the corresponding third exhaust gaps to be discharged to the outside of the 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.

[0118] 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.

[0119] 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.

[0120] In some embodiments, along a thickness direction of the wall portion, the shielding member does not extend beyond the first surface.

[0121] In the above technical solution, by setting the shielding member so as not to extend beyond 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, thereby further reducing the wear of the shielding member.

[0122] 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.

[0123] In the above technical solution, by setting the fourth surface of the shielding member facing away from the one-way valve and the first surface of the wall facing 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.

[0124] In some embodiments, the shielding member is fixedly connected to the wall portion.

[0125] 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 the setting of information codes or connection of other components such as detection elements on the shielding member.

[0126] In some embodiments, the battery cell further includes a protective patch; the protective patch is arranged on the side of the wall portion facing away from the electrode assembly, and an information collection hole is provided on the protective patch that passes through 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.

[0127] In the above technical solution, the battery cell is also provided with a protective patch. By arranging the protective patch on the side of the wall away from the electrode assembly, it can protect the wall. In addition, by arranging 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 damage and pulling of the one-way valve by components such as sampling detection elements. On the other hand, it can improve the aesthetics of the outer surface of the battery cell. On the other hand, by arranging the information collection holes of the shielding member and the protective patch in correspondence, the area where the battery cell is exhausted through the one-way valve can be arranged in correspondence with 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 shell, which is conducive to improving the integration of the battery cell.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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 via the adhesive layer. This helps reduce the difficulty of assembling the protective patch and improves the stability of the connection of the protective patch to the wall. In addition, a first avoidance hole is provided in the adhesive layer at a position 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 within the first avoidance hole. This reduces the obstruction of the exhaust port of the exhaust channel by the adhesive layer, allowing gas exhausted through the exhaust channel to enter the information collection hole through the gap between the protective patch and the wall before being exhausted. This allows the protective patch to be bonded to the wall while reducing the impact on the exhaust of the one-way valve.

[0132] 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 the side of the wall away from the electrode assembly, and the protective patch covers the exhaust port.

[0133] In the above technical solution, a protective patch is provided on the side of the wall 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. 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.

[0134] 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.

[0135] 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 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 shell, which is beneficial to improving the production efficiency of the battery cell and reducing the manufacturing cost of the battery cell.

[0136] In some embodiments, the outer shell includes a shell and an end cover; a housing having an opening is formed inside the shell, and the housing 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.

[0137] In the above technical solution, by configuring the wall portion of the outer shell as an end cap for sealing the opening of the shell, a battery cell with this structure facilitates installation of a one-way valve on the end cap, thereby reducing the difficulty of battery cell assembly and improving battery cell production efficiency. Similarly, by configuring the wall portion of the outer shell as a wall of the shell, a battery cell with this structure can reduce the impact of stress generated when the end cap and shell are connected to each other on the one-way valve, thereby alleviating damage to the one-way valve and thereby improving the stability and service life of the battery cell.

[0138] 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.

[0139] In the above technical solution, by setting the opening pressure of the one-way valve 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 pressure relief in advance before the thermal runaway of the battery cell 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.

[0140] In some embodiments, an exhaust rate of the one-way valve is smaller than an exhaust rate of the pressure relief mechanism.

[0141] 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 and opened can be alleviated when the battery cell thermal runaway occurs. This allows the pressure relief mechanism to actuate and stably discharge the internal pressure of the battery cell when the battery cell thermal runaway occurs, thereby helping to reduce the risk of fire and explosion of the battery cell when the battery cell thermal runaway occurs.

[0142] 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.

[0143] In the above technical solution, the battery cells are further provided with electrode terminals for inputting or outputting electrical energy from the battery cells, and a current collecting member connects the electrode assembly and the electrode terminals, thereby reducing the difficulty of connecting the electrode assembly and the electrode terminals. Furthermore, by providing a clearance groove in the current collecting member, and by extending the one-way valve into the clearance groove in the thickness direction of the wall portion, the clearance groove allows the current collecting member to avoid the one-way valve, thereby reducing the interference between the current collecting member and the one-way valve. Furthermore, the space occupied by the one-way valve and the current collecting member within the housing is reduced, thereby facilitating an increase in the energy density of the battery cells.

[0144] In a second aspect, an embodiment of the present application further provides a battery comprising the above-mentioned battery cell.

[0145] 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

[0146] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. 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 relevant drawings can be obtained based on these drawings without creative work.

[0147] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0148] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0149] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0150] FIG4 is an exploded view of the structure of a battery cell provided in some embodiments of the present application;

[0151] FIG5 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0152] FIG6 is a schematic structural diagram of a one-way valve provided in some embodiments of the present application;

[0153] FIG7 is an exploded view of a one-way valve according to some embodiments of the present application;

[0154] FIG8 is a cross-sectional view of a one-way valve provided in some embodiments of the present application;

[0155] FIG9 is a schematic structural diagram of a one-way valve provided in yet other embodiments of the present application;

[0156] FIG10 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0157] FIG11 is a schematic structural diagram of a one-way valve provided in some other embodiments of the present application;

[0158] FIG12 is a cross-sectional view of a one-way valve provided in some other embodiments of the present application;

[0159] FIG13 is a cross-sectional view of a one-way valve provided in some other embodiments of the present application;

[0160] FIG14 is a cross-sectional view of a one-way valve provided in yet other embodiments of the present application;

[0161] FIG15 is a schematic structural diagram of a blocking member of a one-way valve provided in yet other embodiments of the present application;

[0162] FIG16 is a partial cross-sectional view of a wall portion of a housing of a battery cell provided in some embodiments of the present application;

[0163] FIG17 is a partial cross-sectional view of an insulating member of a battery cell provided in some embodiments of the present application;

[0164] FIG18 is a partial cross-sectional view of a battery cell provided in some other embodiments of the present application;

[0165] FIG19 is a partial cross-sectional view of an insulating member of a battery cell provided in some further embodiments of the present application;

[0166] FIG20 is a top view of a battery cell (after removing the protective film) provided in some embodiments of the present application;

[0167] FIG21 is a partial enlarged view of the battery cell at point A shown in FIG20 ;

[0168] FIG22 is a schematic diagram illustrating the connection between a shielding member and a wall portion of a battery cell provided in some embodiments of the present application;

[0169] FIG23 is a schematic structural diagram of a shielding member provided in some embodiments of the present application in other embodiments;

[0170] FIG24 is a schematic diagram of the structure of the shielding member provided in some embodiments of the present application in other embodiments;

[0171] FIG25 is a bottom view of a shielding member of a battery cell provided in some embodiments of the present application;

[0172] FIG26 is a schematic diagram of the connection between the protective patch and the wall according to some embodiments of the present application;

[0173] FIG27 is a schematic diagram of the connection between the protective patch and the adhesive layer provided in some embodiments of the present application;

[0174] FIG28 is a schematic diagram of the partial structure of a battery cell provided in some embodiments of the present application.

[0175] 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 portion; 2314d-first stress relief groove; 2315-valve cover; 2315a-convex portion; 2315b-first guide column; 2315c-first limiting groove; 232-valve core; 2321-elastic member; 2322-blocking member; 2322a-pressing portion; 2322b-sealing portion; 2322c - second guide post; 2322d - second limiting groove; 2322e - limiting protrusion; 2322f - first abutting surface; 2322g - second abutting surface; 2322h - snap-fit ​​groove; 2322k - snap-fit ​​portion; 24 - electrode terminal; 25 - pressure relief mechanism; 26 - insulating member; 261 - main body; 2611 - assembly hole; 2612 - receiving groove; 262 - receiving portion; 2621 - second through hole; 2622 - first wall; 2623 - second wall; 2624 - flange portion; 27 - shielding member; 271 - first corner surface; 272 - second One side surface; 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

[0176] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0177] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" 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-secondary relationship.

[0178] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0179] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0180] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0181] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0182] The term "plurality" used in this application refers to two or more (including two).

[0183] 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.

[0184] The battery cells can be lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-hydrogen batteries, nickel-cadmium batteries, lead-acid batteries, etc., which are not limited in the embodiments of the present application.

[0185] A battery cell typically includes an electrode assembly. This assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of a battery cell, active ions (such as lithium ions) are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, prevents short circuits between the positive and negative electrodes while allowing the active ions to pass through.

[0186] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0187] 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 provided on either or both of the two facing surfaces of the positive electrode current collector.

[0188] 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 layer 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.).

[0189] 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 battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. 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 LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0190] In some embodiments, a positive electrode may be a metal foam. The metal foam may be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam, among others. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not be provided with a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled and / or deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0191] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0192] As an example, the negative electrode current collector can be a metal foil, a metal foam, or a composite current collector. For example, as the metal foil, aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium can be used. The metal foam can be nickel foam, copper foam, aluminum foam, alloy foam, or carbon foam. The composite current collector can include a polymer material base layer 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.).

[0193] 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.

[0194] 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 provided on either or both of the two facing surfaces of the negative electrode current collector.

[0195] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well 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.

[0196] 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.

[0197] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0198] In some embodiments, the separator is a separator membrane. There are many types of separator membranes, and any known separator membrane with a porous structure having good chemical stability and mechanical stability can be selected.

[0199] As an example, the separator can be made of at least one of fiberglass, non-woven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator can be a single-layer film or a multi-layer composite film. In the case of a multi-layer composite film, the materials of each layer can be the same or different. The separator can be a separate component positioned between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0200] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0201] In some embodiments, the battery cell further includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel, or solid. Liquid electrolytes include an electrolyte salt and a solvent.

[0202] 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 bisoxalatoborate, lithium difluorodioxalatophosphate, and lithium tetrafluorooxalatophosphate.

[0203] In some embodiments, the solvent may include at least one of ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methylpropyl carbonate, ethylpropyl 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.

[0204] Among them, the gel electrolyte includes a skeleton network with a polymer as the electrolyte, combined with an ionic liquid-lithium salt.

[0205] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0206] 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, or the like.

[0207] 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.

[0208] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0209] 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.

[0210] In some embodiments, the electrode assembly is a laminate structure.

[0211] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0212] 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.

[0213] As an example, both the positive electrode sheet and the negative electrode sheet are folded to form a plurality of stacked folded segments.

[0214] As an example, a plurality of separators may be provided, each of which is disposed between any adjacent positive electrode sheets or negative electrode sheets.

[0215] As an example, the separator may be provided continuously, and may be provided between any adjacent positive electrode sheets or negative electrode sheets by folding or winding.

[0216] In some embodiments, the shape of the electrode assembly can be cylindrical, flat, or polygonal.

[0217] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0218] In some embodiments, a 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 (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0219] As an example, the battery cells may be cylindrical, prismatic, soft-pack or other shaped battery cells. Prismatic battery cells include but are not limited to square-shell, blade-shaped, and polygonal batteries, such as hexagonal batteries.

[0220] 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.

[0221] 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.

[0222] 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 housed in the case.

[0223] 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.

[0224] In some embodiments, the battery may be an energy storage device, including an energy storage container, an energy storage cabinet, and the like.

[0225] Batteries, with their outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide adaptability, and low self-discharge coefficient, are a vital component of today's new energy development. The development of battery technology requires simultaneous consideration of multiple design factors, including performance parameters such as energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, battery safety must be considered. With the rapid development and increasing demand for batteries, demands for battery life and reliability are also increasing.

[0226] In battery technology, for typical battery cells, to ensure their safety, a pressure relief mechanism is typically installed on their outer casing. This mechanism releases internal pressure within the battery cell, effectively improving its safety. In related art, during use, a battery cell generates a certain amount of gas, which increases the pressure within the outer casing. This can cause the pressure relief mechanism to prematurely activate and release pressure, resulting in poor stability and a negative impact on the battery cell's lifespan and reliability.

[0227] 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, which 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, and the one-way valve is arranged on the wall portion. The one-way valve is used to discharge the gas inside the shell.

[0228] In a battery cell of this structure, a one-way valve is provided on the wall of the shell so that the one-way valve can be opened in one direction and discharge the gas inside the shell to the outside of the shell. Therefore, 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, thereby alleviating the phenomenon that the internal pressure of the battery cell reaches the threshold value prematurely due to the increase in the internal gas pressure of the battery cell, causing the battery cell to actuate and release pressure prematurely, thereby effectively improving the use stability of the battery cell, thereby improving the service life and reliability of the battery cell.

[0229] The battery cells disclosed in the embodiments of this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft, and can also be used in energy storage devices. A power supply system comprising the battery cells and batteries disclosed in this application can be used to construct such electrical devices. This helps mitigate the problem of premature valve opening and pressure relief during battery cell use, thereby increasing the battery cell's service life and reliability.

[0230] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. 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. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0231] For the convenience of description, the following embodiments are described by taking a vehicle as an example of an electrical device according to an embodiment of the present application.

[0232] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can 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 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0233] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also 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.

[0234] Please refer to Figure 2, which is an exploded view of the structure of a battery 100 provided in some embodiments of the present application. The battery 100 may include a housing 10 and a battery cell 20, wherein the battery cell 20 is configured to be accommodated in the housing 10.

[0235] The housing 10 is used to provide assembly space for the battery cells 20 and can have various structures. In some embodiments, the housing 10 can include a first housing body 11 and a second housing body 12. The first housing body 11 and the second housing body 12 overlap each other, and together, the first housing body 11 and the second housing body 12 define an assembly space for accommodating the battery cells 20. The second housing body 12 can be a hollow structure with one end open. The first housing body 11 can be a plate-like structure, and the first housing body 11 overlaps the open side of the second housing body 12, so that the first housing body 11 and the second housing body 12 jointly define an assembly space. In other embodiments, the first housing body 11 and the second housing body 12 can also be hollow structures with one end open, with the open side of the first housing body 11 overlapping the open side of the second housing body 12. Of course, the housing 10 formed by the first housing body 11 and the second housing body 12 can have various shapes, such as a cylinder or a rectangular parallelepiped. For example, in Figure 2, the housing 10 is in the shape of a rectangular parallelepiped.

[0236] Optionally, in the battery 100, the battery cell 20 housed in the housing 10 may be one or more. When there are multiple battery cells 20 housed in the housing 10, the multiple battery cells 20 may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of both series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire module formed by the multiple battery cells 20 may be housed in the housing 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 a hybrid connection, and then the multiple battery modules may be connected in series, in parallel, or in a hybrid connection to form an entire module, which is then housed in the housing 10.

[0237] In some embodiments, the battery 100 may further include other structures. For example, the battery 100 may further include a busbar component disposed in the housing 10 , and the busbar component connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0238] Each battery cell 20 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 20 can be cylindrical, flat, rectangular, or in other shapes. For example, in FIG2 , the battery cell 20 is a rectangular parallelepiped.

[0239] According to some embodiments of the present application, with reference to Figures 3, 4, 5, and 6, Figure 3 is a schematic structural diagram of a battery cell 20 provided in some embodiments of the present application, Figure 4 is an exploded structural diagram of a battery cell 20 provided in some embodiments of the present application, Figure 5 is a partial cross-sectional view of a battery cell 20 provided in some embodiments of the present application, and Figure 6 is a schematic structural diagram of a one-way valve 23 provided in some embodiments of the present application. The present application provides a battery cell 20, which includes a housing 21, an electrode assembly 22, and a one-way valve 23. The housing 21 has a wall portion 211, the electrode assembly 22 is accommodated in the housing 21, and the one-way valve 23 is provided on the wall portion 211. The one-way valve 23 is used to discharge gas from the interior of the housing 21.

[0240] The housing 21 can also be used to contain an electrolyte, such as an electrolyte solution. The housing 21 can have various structural forms, such as a cylinder or a rectangular parallelepiped. Similarly, the housing 21 can be made of various materials, such as copper, iron, aluminum, steel, or an aluminum alloy.

[0241] In some embodiments, the housing 21 may include a shell 212 and an end cover 213. A accommodating cavity is formed inside the shell 212, and the accommodating cavity is used to accommodate the electrode assembly 22. The accommodating cavity has an opening 2121. That is, the shell 212 is a hollow structure with an opening 2121 at one end. The end cover 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.

[0242] It should be noted that the wall portion 211 for mounting the one-way valve 23 can be the end cap 213 of the outer shell 21 or a wall of the housing 212 of the outer shell 21. For example, in FIG3 , the wall portion 211 is the end cap 213. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the wall portion 211 can also be the bottom wall of the housing 212 disposed opposite the end cap 213, or the side wall of the housing 212 and the end cap 213 adjacent to and connected to each other.

[0243] When assembling the battery cell 20 , the electrode assembly 22 may be placed into the housing 212 first, and the housing 212 may be filled with electrolyte. The end cap 213 may then be placed over the opening 2121 of the housing 212 to complete the assembly of the battery cell 20 .

[0244] The housing 212 can have a variety of shapes, such as a cylinder, a rectangular parallelepiped, or a prismatic structure. The shape of the housing 212 can be determined based on the specific shape of the electrode assembly 22. For example, if the electrode assembly 22 has a cylindrical structure, a cylindrical housing 212 can be selected; if the electrode assembly 22 has a rectangular parallelepiped structure, a rectangular parallelepiped housing 212 can be selected. Of course, the structure of the end cap 213 can also be various, such as a plate-like structure or a hollow structure with one end open. For example, in Figure 3, the housing 212 has a rectangular parallelepiped structure.

[0245] Of course, it is understandable that the shell 21 is not limited to the above structure. The shell 21 may also be other structures. For example, the shell 21 may include a shell 212 and two end covers 213. The shell 212 is a hollow structure with openings 2121 on opposite sides. One end cover 213 corresponds to an 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. That is, the shell 212 is formed with openings 2121 on opposite sides, and the two end covers 213 are respectively covered on both sides of the shell 212 to close the corresponding openings 2121.

[0246] It should be noted that the electrode assembly 22 is the component where electrochemical reactions occur in the battery cell 20. The structure of the electrode assembly 22 can be various. For example, the electrode assembly 22 can be a wound structure formed by winding the positive electrode sheet, the separator and the negative electrode sheet, or it can be a stacked structure formed by stacking the positive electrode sheet, the separator and the negative electrode sheet.

[0247] Exemplarily, the separator 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.

[0248] Optionally, the number of electrode assemblies 22 housed within the housing 21 may be one or more. For example, in FIG3 , the housing 21 of the battery cell 20 is provided with two electrode assemblies 22, which are stacked along the thickness of the housing 21. In other embodiments, the number of electrode assemblies 22 housed within the housing 21 may be one, three, four, five, six, seven, or eight, etc.

[0249] It should be noted that the one-way valve 23 is provided on the wall portion 211. The one-way valve 23 is used to exhaust the gas inside the shell 21. That is, the one-way valve 23 can be opened in one direction to exhaust gas, so that the gas inside the shell 21 can be discharged to the outside of the shell 21 through the one-way valve 23. Optionally, the one-way valve 23 can be provided on the wall portion 211 in various structures. The one-way valve 23 can be welded to the wall portion 211, or the one-way valve 23 can be clamped to the wall portion 211, or the one-way valve 23 can be adhered to the wall portion 211. The outside of the shell 21 refers to the external environment of the battery cell 20.

[0250] For example, in Figure 5, 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 with the hole wall surface of the mounting hole 2111.

[0251] In some embodiments, the battery cell 20 may further include an electrode terminal 24 . The electrode terminal 24 is insulated and mounted on the housing 21 . The electrode terminal 24 is electrically connected to the electrode assembly 22 to output or input electrical energy of the battery cell 20 .

[0252] 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 .

[0253] In FIG3 , the battery cell 20 includes two electrode terminals 24. Correspondingly, each electrode assembly 22 has two tabs 221 with opposite polarities. The two electrode terminals 24 are electrically connected to the two tabs 221 of the electrode assembly 22, respectively, to enable input or output of the positive and negative electrodes of the battery cell 20. It should be noted that the tabs 221 of the electrode assembly 22 are formed by stacking and connecting the regions of the positive electrode sheet not coated with the positive electrode active material layer, or by stacking and connecting the regions of the negative electrode sheet not coated with the negative electrode active material layer. If the tabs 221 are used to output the positive electrode of the electrode assembly 22, then the tabs 221 are formed by stacking and connecting the regions of the positive electrode sheet not coated with the positive electrode active material layer; if the tabs 221 are used to output the negative electrode of the electrode assembly 22, then the tabs 221 are formed by stacking and connecting the regions of the negative electrode sheet not coated with the negative electrode active material layer.

[0254] 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.

[0255] The electrode terminals 24 may be mounted on the outer shell 21 in various structures. For example, in FIG3 , both electrode terminals 24 are mounted on the end cap 213 of the outer shell 21. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, both electrode terminals 24 may be mounted on the shell 212 of the outer shell 21. Similarly, one electrode terminal 24 may be mounted on the shell 212 of the outer shell 21, and the other electrode terminal 24 may be mounted on the end cap 213 of the outer shell 21.

[0256] In some embodiments, the battery cell 20 may further include a pressure relief mechanism 25, which is mounted on the housing 21. Optionally, the pressure relief mechanism 25 may be disposed on the end cap 213 of the housing 21 or on the shell 212 of the housing 21. The pressure relief mechanism 25 is configured to relieve pressure within the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0257] For example, in FIG4 , the pressure relief mechanism 25 is provided on the end cover 213 of the housing 21 . The pressure relief mechanism 25 may be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, a pressure relief valve or a safety valve.

[0258] By arranging a one-way valve 23 on the wall 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 in the internal air pressure of the battery cell 20, thereby causing the battery cell 20 to be actuated and depressurized in advance, thereby effectively improving the use stability of the battery cell 20, thereby improving the service life and reliability of the battery cell 20.

[0259] According to some embodiments of the present application, referring to Figures 5 and 6, and further referring to Figures 7 and 8, Figure 7 is an exploded view of the structure of a one-way valve 23 provided in some embodiments of the present application, and Figure 8 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 disposed on the wall portion 211. An installation cavity 2311 is formed within the valve body 231. The valve body 231 is provided with an air inlet 2312 and an air outlet 2313. The air inlet 2312 is used to connect the installation cavity 2311 with the interior of the housing 21, and the air outlet 2313 is used to connect the installation cavity 2311 with the exterior of the housing 21. The valve core 232 is disposed within the installation cavity 2311. The valve core 232 is used to block the air inlet 2312 and is used to open the air inlet 2312 in response to gas inside the housing 21.

[0260] 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.

[0261] The valve core 232 is used to block the air inlet 2312 and to open the air inlet 2312 under the action of the gas inside the 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 interior 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.

[0262] Optionally, the structure of the valve core 232 can be various. For example, in Figures 5 and 7, the valve core 232 can include an elastic member 2321 and a blocking member 2322. The elastic member 2321 and the blocking member 2322 are both 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 air inlet 2312 is closed. The gas can overcome the elastic force of the elastic member 2321 and push the blocking member 2322 to open the air inlet 2312, allowing 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. Conversely, after the gas inside the housing 21 is discharged and the force of the gas inside the housing 21 acting 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, thereby blocking the air inlet 2312. Of course, in other embodiments, the valve core 232 can also be an entire elastic member, such as elastic rubber.

[0263] 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.

[0264] According to some embodiments of the present application, as shown in Figures 5, 7, and 8, 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 is provided with an air inlet 2312. Along the thickness direction X of the wall portion, the valve cover 2315 is disposed at an end of the valve body 2314 facing away from the electrode assembly 22. The valve cover 2315 and the valve body 2314 together enclose a mounting cavity 2311.

[0265] The valve body 2314 is disposed on the wall portion 211 and extends into the housing 21 along the wall thickness direction X. That is, the valve body 2314 protrudes from the surface of the wall portion 211 facing the electrode assembly 22 along the wall thickness direction X. The valve body 2314 is sealed and mounted in the mounting hole 2111. The valve body 2314 can be welded to the wall portion 211 or bonded to the wall portion 211 using a sealant.

[0266] 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 can also be provided on the outer peripheral surface of the part of the valve body 2314 extending into the outer shell 21.

[0267] Optionally, the valve cover 2315 is disposed at an end of the valve body 2314 facing away from the electrode assembly 22. The valve cover 2315 may be connected to the end of the valve body 2314 facing away from the electrode assembly 22, or the valve cover 2315 may be connected to the wall portion 211, with the valve cover 2315 and the valve body 2314 arranged along the wall portion's thickness direction X. For example, in Figures 5 and 8, the valve cover 2315 is connected to the end of the valve body 2314 facing away from the electrode assembly 22, so that the valve cover 2315 and the interior of the valve body 2314 together enclose a mounting cavity 2311 for accommodating the valve core 232.

[0268] 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.

[0269] For example, the valve body 2314 can be made of a metal material, such as copper, iron, aluminum, steel, or an aluminum alloy. Similarly, the valve cover 2315 can also be made of a metal material, such as copper, iron, aluminum, steel, or an aluminum alloy. The valve body 2314 and the valve cover 2315 can be made of the same material or different materials.

[0270] 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 divided into 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.

[0271] In some embodiments, referring to FIG. 6 , FIG. 7 and FIG. 8 , 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 .

[0272] The air outlet 2313 penetrates 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 .

[0273] Optionally, the number of gas outlets 2313 provided on the valve cover 2315 may be one or more. For example, in FIG6 , the valve cover 2315 is provided with three gas outlets 2313 . Of course, in other embodiments, the number of gas outlets 2313 provided on the valve cover 2315 may also be two, four, five, or six.

[0274] As an example, a plurality of air outlets 2313 are provided on the valve cover 2315 , and the plurality of air outlets 2313 are arranged at equal intervals.

[0275] As an example, multiple gas outlets 2313 are arranged at equal intervals around the center of the valve cover 2315, which can make the gas flow out more smoothly.

[0276] By setting a first through hole on the valve cover 2315 of the valve body 231 to form the air outlet 2313 of the valve body 231, the installation cavity 2311 of the valve body 231 can be connected with the outside of the shell 21 through the first through hole set on the valve cover 2315. The valve body 231 with this structure can reduce the interference effect of the air outlet 2313 on the connection between the valve cover 2315 and the valve body 2314, which is conducive to reducing the difficulty of assembling the valve cover 2315 and the valve body 2314.

[0277] Of course, 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 structure of the gas outlet 2313 is not limited thereto. In some embodiments, referring to FIG. 9 , which is a schematic structural diagram of the one-way valve 23 provided in yet other embodiments of the present application, 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.

[0278] 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. 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.

[0279] 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.

[0280] According to some embodiments of the present application, as shown in Figures 6, 7 and 8, the valve cover 2315 is connected to the valve body 2314, and a sink 2314a is provided at one end of the valve body 2314 facing away from the electrode assembly 22, and at least a portion of the valve cover 2315 is accommodated in the sink 2314a.

[0281] The installation cavity 2311 passes through 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 enclose the installation cavity 2311.

[0282] At least part of the valve cover 2315 is accommodated in the recessed groove 2314a, that is, the valve cover 2315 can be located in the recessed groove 2314a as a whole or partially in the recessed groove 2314a. In other words, in the thickness direction X of the wall, the valve cover 2315 can be extended out of the recessed groove 2314a or not extended out of the recessed groove 2314a.

[0283] By providing a recessed groove 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 recessed groove 2314a, the one-way valve 23 adopting this 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.

[0284] 8 , along the wall thickness direction X, the valve cover 2315 does not extend beyond the end of the valve body 2314 facing away from the electrode assembly 22. In other words, the entire valve cover 2315 is located within the recess 2314a.

[0285] 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 .

[0286] 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.

[0287] In some embodiments, as shown in FIG. 5 , 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 .

[0288] In which, 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.

[0289] 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 thereby increase the service life of the one-way valve 23.

[0290] Of course, the assembly structure of the one-way valve 23 and the wall portion 211 is not limited to this. In some embodiments, the battery cell 20 can also be other structures. For example, referring to Figure 10, Figure 10 is a partial cross-sectional view of the battery cell 20 provided in some embodiments of the present application. 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.

[0291] The valve cover 2315 is located at the end of the valve body 2314 away from the electrode assembly 22 in the thickness direction X of the wall. 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.

[0292] For example, in Figure 10, 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.

[0293] Alternatively, the valve cover 2315 may be connected to the wall portion 211 in various configurations. For example, the valve cover 2315 may be welded to the side surface of the mounting groove 2113, or the valve cover 2315 may be interference-fitted with the side surface of the mounting groove 2113. Similarly, the air outlet 2313 is a second exhaust gap formed between the valve cover 2315 and the wall portion 211. The second exhaust gap may also have various configurations. For example, the valve cover 2315 may be provided with a first groove on the outer circumference of the valve cover 2315, with the second exhaust gap formed between the bottom surface of the first groove and the side surface of the mounting groove 2113.

[0294] By connecting the valve cover 2315 to the wall 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 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 211, which is beneficial to reduce the phenomenon that the air outlet 2313 is blocked by other components of the battery cell 20.

[0295] According to some embodiments of the present application, as shown in FIG5 , the valve body 2314 of the valve body 231 is configured as a separate structure from the wall portion 211. The wall portion 211 is provided with a mounting hole 2111 that connects the interior of the housing 21 with the exterior of the housing 21. The valve body 2314 of the valve body 231 is inserted into the mounting hole 2111 and is sealed to the wall surface of the mounting hole 2111. Of course, in some embodiments, the battery cell 20 can also have other structures, such as the valve body 2314 and the wall portion 211 being integrally formed. In other words, the valve body 2314 of the valve body 231 and the wall portion 211 are an integral structure, manufactured through an integral molding process, such as stamping or casting. By configuring the valve body 2314 of the valve body 231 and the wall portion 211 as an integrally formed structure, the structural stability and strength of the valve body 2314 disposed on the wall portion 211 are improved.

[0296] According to some embodiments of the present application, as shown in Figures 5, 7, and 8, 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.

[0297] 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, and conversely, when the blocking piece 2322 moves away from the air inlet 2312, it can open the air inlet 2312.

[0298] Illustratively, the air inlet 2312 is disposed at one end of the valve body 2314 in the wall thickness direction X, close to the electrode assembly 22. That is, the air inlet 2312 extends through the bottom surface of the mounting cavity 2311. Accordingly, the blocking member 2322 is movably disposed within the mounting cavity 2311 along the wall thickness direction X, such that the blocking member 2322 can block the air inlet 2312 when abutting against the bottom surface of the mounting cavity 2311. Of course, in other embodiments, the air inlet 2312 may also be disposed on a radially oriented side of the valve body 2314. Accordingly, the blocking member 2322 is movably disposed within the mounting cavity 2311 along the radial direction of the valve body 2314.

[0299] The sealing member 2322 is used to seal 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 sealing member 2322, so that the sealing member 2322 can abut against the bottom surface of the installation cavity 2311 to seal the air inlet 2312. Conversely, when the force of the gas inside the shell 21 acting on the sealing 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 sealing member 2322 to separate from the bottom surface of the installation cavity 2311, so as to realize the sealing member 2322 opening the air inlet 2312, 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.

[0300] Optionally, the elastic member 2321 is an elastic component, and its structure can be various, such as a spring, a spring or elastic rubber.

[0301] The valve core 232 of the one-way valve 23 is provided with an elastic part 2321 and a sealing part 2322, and the elastic part 2321 and the sealing part 2322 are both arranged in the installation cavity 2311, so that the elastic part 2321 can apply elastic force to the sealing part 2322, so that the sealing part 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 part 2322 and overcome the elastic force of the elastic part 2321, so that the sealing part 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.

[0302] In some embodiments, as shown in Figures 7 and 8, the elastic member 2321 is a spring. Of course, in other embodiments, the elastic member 2321 can also be a spring or elastic rubber.

[0303] 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.

[0304] 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.

[0305] Optionally, the elastic member 2321, in a compressed state, positioned between the valve cover 2315 and the blocking member 2322 has a compression margin greater than or equal to 0.5 mm, so that the elastic member 2321 has sufficient compression margin for the blocking member 2322 to move along the wall thickness direction X, thereby enabling the blocking member 2322 to open the air inlet 2312. If the elastic member 2321 is a spring, the sum of the gaps between the spring coils in the wall thickness direction X is greater than or equal to 0.5 mm.

[0306] 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, which is beneficial to reducing the difficulty of assembling the elastic member 2321 in the installation cavity 2311, and on the other hand, it can ensure that the direction of the elastic force applied by the elastic member 2321 to the sealing member 2322 is relatively stable.

[0307] 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, thereby improving the service life of the elastic member 2321.

[0308] According to some embodiments of the present application, as shown in Figures 5, 7 and 8, along the thickness direction X of the wall, the valve cover 2315 and the blocking member 2322 are spaced apart, the two 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.

[0309] In particular, along the thickness direction X of the wall portion, the valve cover 2315 and the bottom surface of the installation cavity 2311 are arranged facing each other, and the elastic member 2321 is disposed between the valve cover 2315 and the blocking member 2322, so that the blocking member 2322 can abut against the 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 disposed on the cavity wall of the installation cavity 2311, that is, the air inlet 2312 is disposed 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 of the installation cavity 2311, respectively.

[0310] Optionally, the structure of the blocking member 2322 can be various. In Figures 7 and 8, the blocking member 2322 includes a pressing portion 2322a and a sealing portion 2322b. The stiffness of the pressing portion 2322a is greater than the stiffness of the sealing portion 2322b. Along the thickness direction X of the wall, the sealing portion 2322b is connected to the side of the pressing portion 2322a away from the valve cover 2315. The sealing portion 2322b is used to seal the air inlet 2312. The elastic member 2321 is arranged between the valve cover 2315 and the pressing portion 2322a. The pressing 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 sealing the air inlet 2312 through the sealing portion 2322b. Of course, in other embodiments, the blocking member 2322 may also 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.

[0311] By arranging the valve cover 2315 and the blocking member 2322 to be arranged at intervals along the thickness direction X of the wall, the two ends of the elastic member 2321 can respectively abut against the valve cover 2315 and the 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, 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. The blocking member 2322 can move along the thickness direction X of the wall under the action of the elastic member 2321 and block the air inlet 2312. The one-way valve 23 adopting this structure makes it convenient 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.

[0312] According to some embodiments of the present application, as shown in FIG7 and FIG8 , a first guide column 2315 b is protruded from the 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 .

[0313] Among them, the elastic part 2321 is a spring, part of which is sleeved on the outside of the first guide column 2315b, and the end of the spring away from the blocking part 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.

[0314] 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 .

[0315] By protruding a first guide column 2315b on the side of the valve cover 2315 facing the sealing member 2322, and partially sleeved on the outside of the first guide column 2315b, 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 first guide column 2315b, so as to facilitate the assembly of the elastic member 2321, which is conducive to reducing 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, thereby achieving stable compression of the elastic member 2321 along the thickness direction X of the wall, which is conducive to improving the reliability of the elastic member 2321 and further reducing the risk of the sealing member 2322 accidentally opening the air inlet 2312.

[0316] It should be noted that, in an embodiment in which the valve cover 2315 is provided with a first guide column 2315b and the air 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, as shown in Figures 6, 7 and 8, the valve cover 2315 is connected to the valve body 2314, the air outlet 2313 is a first through hole provided on the valve cover 2315, and the air outlet 2313 and the first guide column 2315b are arranged at intervals along the radial direction of the first guide column 2315b.

[0317] The air outlet 2313 is spaced apart from the first guide post 2315b, i.e., the air outlet 2313 is located outside the first guide post 2315b. For example, in Figures 7 and 8, there are three air outlets 2313, spaced apart along the circumference of the first guide post 2315b, circumferentially disposed outside the first guide post 2315b, and surrounding the central axis of the mounting hole 2111. Of course, in other embodiments, there may be two, four, or five air outlets 2313, etc.

[0318] In some embodiments, the valve cover 2315 may also have other structures. For example, referring to Figures 11 and 12, Figure 11 is a schematic structural diagram of a one-way valve 23 provided in some other embodiments of the present application, and Figure 12 is a cross-sectional view of a 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 post 2315b. That is, the air outlet 2313 is provided at the position where the valve cover 2315 has the first guide post 2315b. In other words, the air outlet 2313 extends along the thickness direction X of the wall portion into the first guide post 2315b and penetrates the first guide post 2315b.

[0319] For example, in FIG. 11 and FIG. 12 , an air outlet 2313 is provided on the valve cover 2315 , and the central axis of the air outlet 2313 coincides with the central axis of the first guide column 2315 b .

[0320] By configuring the gas outlet 2313 as a first through hole formed in the valve cover 2315, and by allowing the first through hole to penetrate the first guide post 2315b along the wall thickness direction X, the gas outlet 2313 is located inside the elastic member 2321, thereby reducing interference caused by the gas outlet 2313 on the connection between the valve cover 2315 and the valve body 2314. Similarly, by configuring the gas outlet 2313 as the first through hole formed in the valve cover 2315, and by allowing the gas outlet 2313 to be located outside the first guide post 2315b, gas discharge is facilitated, thereby reducing the risk of the gas outlet 2313 being blocked by the blocking member 2322.

[0321] According to some embodiments of the present application, as shown in FIG. 8 , the diameter of the first guide column 2315 b is D1 , and the inner diameter of the elastic member 2321 is D2 , satisfying 0 mm < D2 − D1 ≤ 5 mm.

[0322] The elastic member 2321 is a spring, and the inner diameter D2 of the elastic member 2321 is the diameter of the cavity formed inside the spring.

[0323] 0mm<D2-D1≤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.

[0324] 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.

[0325] By setting the difference between the inner diameter of the elastic part 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 part 2321 is not convenient to be assembled on the first guide column 2315b due to the difference between the inner diameter of the elastic part 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 part 2321 is sleeved on the first guide column 2315b. On the other hand, the phenomenon that the gap between the elastic part 2321 and the first guide column 2315b is too large due to the large difference between the inner diameter of the elastic part 2321 and the diameter of the first guide column 2315b can be alleviated, so as to reduce the radial movement or radial deformation of the elastic part 2321, thereby improving the balance of the elastic force of the elastic part 2321 on the blocking part 2322, so as to reduce the risk of the blocking part 2322 accidentally opening the air inlet 2312.

[0326] According to some embodiments of the present application, referring to FIG13 , which is a cross-sectional view of a one-way valve 23 provided in 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 an end of the elastic member 2321 away from the blocking member 2322 is inserted into the first limiting groove 2315c.

[0327] Among them, a first limiting groove 2315c is provided on the side of the valve cover 2315 facing the sealing member 2322, that is, the first limiting groove 2315c is provided on the surface of the valve cover 2315 facing the sealing member 2322 in the thickness direction X of the wall. In the embodiment in which a first guide column 2315b is protruding from the side of the valve cover 2315 facing the sealing 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.

[0328] One end of the elastic member 2321 away from the blocking member 2322 is inserted into the first limiting groove 2315 c , that is, the end of the elastic member 2321 away from the blocking member 2322 abuts against the bottom surface of the first limiting groove 2315 c .

[0329] 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 protruding from 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.

[0330] 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, so as to limit the end of the elastic member 2321 against the valve cover 2315, so as to reduce the relative radial slippage between the elastic member 2321 and the valve cover 2315, thereby improving the balance of the elastic force of the elastic member 2321 acting on the sealing member 2322, which is conducive to improving the reliability of the elastic member 2321.

[0331] 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 .

[0332] There are various structures for fixing the elastic member 2321 and the valve cover 2315, such as welding or bonding.

[0333] 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 the 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.

[0334] By fixing one end of the elastic member 2321 away from the blocking 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 acting on the blocking member 2322.

[0335] According to some embodiments of the present application, as shown in Figures 5, 7 and 8, a second guide column 2322c is protruded from the 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.

[0336] Among them, the elastic part 2321 is a spring, part of which is sleeved on the outside of the second guide column 2322c, and the end of the spring away from the valve cover 2315 abuts against the surface of the blocking part 2322 where the second guide column 2322c is protruding, that is, the second guide column 2322c is inserted into the spring.

[0337] Illustratively, the central axis of the second guide column 2322 c 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 2322 c .

[0338] Illustratively, in an embodiment where the blocking member 2322 includes a pressing portion 2322a and a sealing portion 2322b, as shown in FIG7 and FIG8 , the second guide post 2322c is protruded from the surface of the pressing portion 2322a facing the valve cover 2315 .

[0339] By protruding a second guide post 2322c on the side of the blocking member 2322 facing the valve cover 2315, and partially sleeved on the outer side of the second guide post 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 post 2322c, so as to facilitate the assembly of the elastic member 2321, which is conducive to reducing the difficulty of assembling the elastic member 2321; on the other hand, the second guide post 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, thereby achieving stable compression of the elastic member 2321 along the thickness direction X of the wall, which is conducive to improving the reliability of the elastic member 2321, and further reducing the risk of the blocking member 2322 accidentally opening the air inlet 2312.

[0340] According to some embodiments of the present application, as shown in FIG. 8 , the diameter of the second guide column 2322 c is D3 , and the inner diameter of the elastic member 2321 is D2 , satisfying 0 mm < D3 − D1 ≤ 5 mm.

[0341] The elastic member 2321 is a spring, and the inner diameter D2 of the elastic member 2321 is the diameter of the cavity formed inside the spring.

[0342] 0mm<D3-D1≤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.

[0343] Exemplarily, the difference between the inner diameter of the elastic member 2321 and the diameter of the second guide post can be 0mm, 0.1mm, 0.2mm, 0.5mm, 0.8mm, 1mm, 1.2mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm or 5mm, etc.

[0344] By setting the difference between the inner diameter of the elastic part 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 part 2321 is not convenient to be assembled on the second guide column 2322c due to the difference between the inner diameter of the elastic part 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 part 2321 is sleeved on the second guide column 2322c. On the other hand, the phenomenon that the gap between the elastic part 2321 and the second guide column 2322c is too large due to the large difference between the inner diameter of the elastic part 2321 and the diameter of the second guide column 2322c can be alleviated, so as to reduce the radial movement or radial deformation of the elastic part 2321, thereby improving the balance of the elastic force of the elastic part 2321 on the blocking part 2322, so as to reduce the risk of the blocking part 2322 accidentally opening the air inlet 2312.

[0345] According to some embodiments of the present application, as shown in FIG13 , a second limiting groove 2322d is provided on the 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.

[0346] 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. In the embodiment in which a second guide column 2322c is protruding from 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.

[0347] 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.

[0348] 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.

[0349] Illustratively, in an embodiment where the blocking member 2322 includes a pressing portion 2322a and a sealing portion 2322b, as shown in FIG7 and FIG8 , the second limiting groove 2322d is provided on the surface of the pressing portion 2322a facing the valve cover 2315 .

[0350] 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 is resting on the sealing member 2322, so as to reduce the relative radial slippage between the elastic member 2321 and the sealing member 2322, thereby improving the balance of the elastic force exerted by the elastic member 2321 on the sealing member 2322, which is beneficial to improving the reliability of the elastic member 2321.

[0351] 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 .

[0352] There are various structures for fixing the elastic member 2321 and the blocking member 2322, such as welding or bonding.

[0353] 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.

[0354] By fixing one end of the elastic member 2321 away from the valve cover 2315 to 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 acting on the blocking member 2323.

[0355] According to some embodiments of the present application, as shown in FIG. 7 and FIG. 8 , the blocking member 2322 is spaced apart from the side surface of the installation cavity 2311 .

[0356] 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 .

[0357] By spacing the blocking piece 2322 and the side surface of the installation cavity 2311, 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.

[0358] Of course, the structure of the one-way valve 23 is not limited to this. For example, in some embodiments, referring to Figures 14 and 15, Figure 14 is a cross-sectional view of the one-way valve 23 provided in still other embodiments of the present application, and Figure 15 is a schematic structural diagram of the blocking member 2322 of the one-way valve 23 provided in still other embodiments of the present application. The outer circumferential 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 are guided and engaged with the side surfaces of the mounting cavity 2311.

[0359] 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.

[0360] For example, in FIG14 , the protrusion 2322e is configured to abut against the wall surface of the installation cavity 2311 when the blocking member 2322 moves along the wall thickness direction X, thereby providing guidance and limiting functions. Of course, in other embodiments, the one-way valve 23 may also have other structures. For example, the side surface of the installation cavity 2311 may be provided with a guide groove extending along the wall thickness direction X, into which the limiting protrusion 2322e extends. The limiting protrusion 2322e can move within the guide groove along the thickness direction X when the blocking member 2322 opens the air inlet 2312, thereby providing guidance and limiting functions. Multiple guide grooves extending along the wall thickness direction X may be provided, each of which cooperates with multiple limiting protrusions 2322e.

[0361] Illustratively, in an embodiment where the blocking member 2322 includes a pressing portion 2322a and a sealing portion 2322b, as shown in FIG7 and FIG8 , a limiting protrusion 2322e is protruded from the outer circumferential surface of the pressing portion 2322a.

[0362] Optionally, the shape of the limiting protrusion 2322e can be various, such as a semicircular, triangular, trapezoidal or rectangular structure. For example, in FIG. 15 , the shape of the limiting protrusion 2322e is a semicircular.

[0363] 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 to guide, 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 to guide and limit, thereby improving the stability of the blocking piece 2322 in moving along the thickness direction X of the wall.

[0364] According to some embodiments of the present application, as shown in Figures 7 and 8, the sealing member 2322 may include 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, and the sealing portion 2322b is connected to the side of the pressing portion 2322a away from the valve cover 2315. The sealing portion 2322b is used to seal the air inlet 2312.

[0365] 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 facing away from the valve cover 2315. That is, 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.

[0366] Optionally, the rigidity of the pressing portion 2322a is greater than that of the sealing portion 2322b, i.e., the deformation resistance of the pressing portion 2322a is greater than that of the sealing portion 2322b. This allows the pressing portion 2322a to better press the sealing portion 2322b against the bottom surface of the mounting cavity 2311 to seal the air inlet 2312. For example, 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.

[0367] Optionally, the connection structure between the pressing portion 2322a and the sealing portion 2322b can be various, such as clamping, bolting, or bonding.

[0368] By setting the sealing member 2322 to include a pressing portion 2322a and a sealing portion 2322b, the pressing portion 2322a is set on the side of the sealing portion 2322b facing the valve cover 2315, and the sealing portion 2322b is used to seal the air inlet 2312, and the two ends of the elastic member 2321 are respectively against the valve cover 2315 and the pressing portion 2322a, so that the elastic member 2321 can exert elastic force on the sealing portion 2322b through the pressing portion 2322a, which is beneficial to improve the balance of the elastic force of the elastic member 2321 on the sealing portion 2322b, and thus can effectively improve the sealing effect of the sealing portion 2322b on the air inlet 2312.

[0369] According to some embodiments of the present application, please continue to refer to Figures 7 and 8, 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-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.

[0370] 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.

[0371] 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, that is, the snap-fitting groove 2322h can also be provided on the first abutting surface 2322f of the clamping portion 2322a, or can be provided on the second abutting surface 2322g of the sealing portion 2322b. For example, in Figure 8, the snap-fitting portion 2322k is protruding from the second abutting surface 2322g of the sealing portion 2322b, and the snap-fitting groove 2322h is provided on the first abutting surface 2322f of the clamping portion 2322a, and the snap-fitting portion 2322k is snap-fitted into the snap-fitting groove 2322h.

[0372] Illustratively, the clamping portion 2322k is a circular columnar structure, and correspondingly, the clamping groove 2322h is a circular groove.

[0373] 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-fit ​​groove 2322h on one of the first abutting surface 2322f and the second abutting surface 2322g, and correspondingly providing a snap-fitting portion 2322k on the other to engage with the snap-fitting groove 2322h, the structural stability of the sealing portion 2322b provided on the clamping portion 2322a can be improved, thereby reducing the radial slippage of the sealing portion 2322b relative to the clamping portion 2322a, and further helping to improve the sealing effect of the sealing portion 2322b on the air inlet 2312, thereby reducing the phenomenon of the air inlet 2312 being accidentally opened.

[0374] In some embodiments, the sealing portion 2322b is bonded to the pressing portion 2322a.

[0375] 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 convenient 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.

[0376] In some embodiments, the material of the sealing portion 2322b includes EPDM, fluororubber or Teflon.

[0377] The sealing part 2322b made of EPDM, fluororubber or Teflon makes the sealing part 2322b have good 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 can reduce the phenomenon of the sealing part 2322b being ineffective in blocking the air inlet 2312 due to the corrosion of the sealing part 2322b.

[0378] According to some embodiments of the present application, as shown in FIG. 8 , 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 0 mm < L ≤ 2 mm.

[0379] 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.

[0380] 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.

[0381] 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 blocking 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 blocking 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 blocking 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 blocking 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 blocking member 2322 in the thickness direction X of the wall.

[0382] By setting the size of the gap between the valve cover 2315 and the blocking member 2322 in the thickness direction X of the wall to be greater than 0 mm and less than or equal to 2 mm, on the one hand, the obstruction of the valve cover 2315 on the blocking member 2322 can be reduced, so that there is space between the valve cover 2315 and the blocking member 2322 for the blocking member 2322 to move along the thickness direction X of the wall, so that when the gas inside the shell 21 pushes the blocking member 2322, the blocking member 2322 can open the air inlet 2312 for exhaust. On the other hand, it can alleviate the phenomenon that the one-way valve 23 occupies too much space in the thickness direction X of the wall due to the excessive gap between the valve cover 2315 and the blocking member 2322, which is beneficial to improving the space utilization rate of the battery cell 20.

[0383] According to some embodiments of the present application, as shown in FIG. 5 , the valve body 2314 is connected to the wall portion 211 by welding.

[0384] The wall portion 211 is provided with a mounting hole 2111 for mounting the valve body 2314, and the valve body 2314 is welded to the wall surface of the mounting hole 2111. Of course, in other embodiments, the valve body 2314 may also be welded to the surface of the wall portion 211 facing away from the electrode assembly 22 or to the surface of the wall portion 211 facing the electrode assembly 22.

[0385] 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.

[0386] According to some embodiments of the present application, referring to Figures 5, 7, and 8, and further referring to Figure 16, Figure 16 is a partial cross-sectional view of the wall portion 211 of the housing 21 of the battery cell 20 provided in some embodiments of the present application. The wall portion 211 is provided with a mounting hole 2111, and at least a portion of the valve body 2314 is accommodated within the mounting hole 2111. The hole wall surface of the mounting hole 2111 includes a first connecting surface 2111a, and the valve body 2314 includes a second connecting surface 2314b. The first connecting surface 2111a and the second connecting surface 2314b are both arranged around the central axis of the mounting hole 2111, and the first connecting surface 2111a and the second connecting surface 2314b are welded together.

[0387] Among them, the mounting hole 2111 provided on the wall portion 211 connects the interior and the exterior of the shell 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 can be located in the mounting hole 2111 as a whole, or can be located only partially in the mounting hole 2111. For example, in Figure 5, part of the valve body 2314 is located in the mounting hole 2111, and the valve body 2314 protrudes from the surface of the side of the wall portion 211 facing the electrode assembly 22 along the thickness direction X of the wall portion.

[0388] The hole wall surface of the mounting hole 2111 includes a first connecting surface 2111a, and the valve body 2314 includes a second connecting surface 2314b. The first connecting surface 2111a and the second connecting surface 2314b are welded together, that is, the part of the valve body 2314 located in the mounting hole 2111 is welded together with the hole wall surface of the mounting hole 2111.

[0389] The first connecting surface 2111a and the second connecting surface 2314b are both arranged around the central axis of the mounting hole 2111. In other words, the first connecting surface 2111a and the second connecting surface 2314b are both annular structures, and the central axes of the first connecting surface 2111a and the second connecting surface 2314b are arranged collinearly with the central axis of the mounting hole 2111, so that the first connecting surface 2111a and the second connecting surface 2314b are welded to each other to form a weld mark of an annular structure.

[0390] The wall portion 211 is provided with a mounting hole 2111 for accommodating the valve body 2314 of the valve body 231, and the valve body 2314 has a second connecting surface 2314b, and the second connecting surface 2314b is welded to the first connecting surface 2111a of the hole wall of the mounting hole 2111 to realize the assembly of the one-way valve 23 to the wall portion 211. The structure of welding the first connecting surface 2111a and the second connecting surface 2314b, both of which are arranged in an annular shape, can improve the connection reliability between the valve body 2314 and the wall portion 211 on the one hand, and improve the sealing effect between the valve body 2314 and the hole wall of the mounting hole 2111 on the other hand.

[0391] According to some embodiments of the present application, as shown in Figures 5, 8 and 16, the first connecting surface 2111a is matched with the second connecting surface 2314b, 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.

[0392] The first connecting surface 2111 a and the second connecting surface 2314 b are matched with each other, that is, the first connecting surface 2111 a and the second connecting surface 2314 b have the same shape and abut against each other.

[0393] 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. In other words, 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.

[0394] For example, in Figures 5 and 8 , the end of the second connection surface 2314b that is away from the electrode assembly 22 in the thickness direction X of the wall is further away from the central axis of the mounting hole 2111 than the end of the second connection surface 2314b that is away from the electrode assembly 22 in the thickness direction X of the wall. Similarly, in Figures 5 and 16 , the end of the first connection surface 2111a that is away from the electrode assembly 22 in the thickness direction X of the wall is further away from the central axis of the mounting hole 2111 than the end of the first connection surface 2111a that is away from the electrode assembly 22 in the thickness direction X of the wall.

[0395] 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 thus can effectively improve the welding quality of the first connecting surface 2111a and the second connecting surface 2314b.

[0396] According to some embodiments of the present application, as shown in Figures 5, 8, and 16, the mounting hole 2111 includes a first hole segment 2111b and a second hole segment 2111c. The first hole segment 2111b and the second hole segment 2111c are arranged along the thickness direction X of the wall portion, and the first hole segment 2111b is located on the side of the second hole segment 2111c facing away from the electrode assembly 22. The hole diameter of the first hole segment 2111b is larger than the hole diameter of the second hole segment 2111c. The hole wall surface of the first hole segment 2111b is a first connecting surface 2111a. The valve body 2314 has a connecting portion 2314c located within the first hole segment 2111b, and the outer peripheral surface of the connecting portion 2314c is a second connecting surface 2314b.

[0397] The diameter of the first hole section 2111b is larger than the diameter of the second hole section 2111c, that is, the mounting hole 2111 has a stepped hole structure. The first hole section 2111b is located on the side of the second hole section 2111c facing away from the electrode assembly 22, that is, the mounting hole 2111 has a stepped hole structure with the diameter gradually increasing from the end close to the electrode assembly 22 to the end away from the electrode assembly 22.

[0398] 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, the valve body 2314 of the valve body 231 has a connecting portion 2314c with 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.

[0399] 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.

[0400] 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 on the outside 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 a 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 convenient to assemble the valve body 2314 from the outside of the wall portion 211 to 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 is beneficial to reduce the difficulty of assembling the valve body 2314 into the mounting hole 2111.

[0401] According to some embodiments of the present application, as shown in Figures 5, 7 and 8, along the thickness direction X of the wall, the end face of the valve body 2314 facing 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 face of the valve body 2314 facing away from the electrode assembly 22.

[0402] Illustratively, the first stress relief groove 2314 d is provided on a surface of the connecting portion 2314 c of the valve body 2314 facing away from the electrode assembly 22 .

[0403] It should be noted that in other embodiments, a second stress relief groove may be provided on the first surface 2112 or the second surface 2114 of the wall portion 211. The second stress relief groove is an annular groove structure and is disposed around the mounting hole 2111. The second stress relief groove can absorb welding stress generated by the welding connection between the valve body 2314 and the wall portion 211. In some embodiments, the first stress relief groove 2314d and the second stress relief groove can be provided simultaneously.

[0404] 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.

[0405] In some embodiments, referring to Figures 6, 7, and 8, the first stress relief groove 2314d is disposed around the central axis of the mounting hole 2111. In other words, the first stress relief groove 2314d is an annular groove structure. For example, the first stress relief groove 2314d is disposed around the outer side of the valve cover 2315.

[0406] 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 improve 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 impact of the welding stress on other components such as the valve core 232 of the one-way valve 23.

[0407] According to some embodiments of the present application, as shown in Figures 4 and 5 , 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 that extends into the interior of the housing 21 is received within the receiving portion 262.

[0408] The insulating member 26 is disposed on a side of the wall portion 211 facing the electrode assembly 22 . The insulating member 26 serves to separate the wall portion 211 and the electrode assembly 22 to insulate and isolate the wall portion 211 and the electrode assembly 22 .

[0409] For example, the insulating member 26 can be made of various materials, such as rubber, silicone, or plastic.

[0410] 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, in Figure 5, the valve body 2314 of the valve body 231 of the one-way valve 23 protrudes from the second surface 2114.

[0411] The portion of the one-way valve 23 extending into the interior of the housing 21 is accommodated in the accommodating portion 262 , that is, the accommodating portion 262 is formed at the position of the insulating member 26 corresponding to the one-way valve 23 , and the accommodating portion 262 covers the outer side of the portion of the one-way valve 23 protruding from the second surface 2114 .

[0412] Optionally, the main body 261 and the accommodating portion 262 of the insulating part 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.

[0413] The battery cell 20 is also provided with an insulating part 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 separated by the main body portion 261, and the receiving portion 262 accommodates the part of the one-way valve 23 protruding from the second surface 2114 of the wall portion 211, which can avoid and protect the one-way valve 23, and can insulate and isolate the electrode assembly 22 and the one-way valve 23, so as to reduce the risk of short circuit between the one-way valve 23 and the electrode assembly 22.

[0414] According to some embodiments of the present application, as shown in FIG5 , the one-way valve 23 includes a valve body 231. Along the thickness direction X of the wall portion, the valve body 231 protrudes from the second surface 2114. The portion of the valve body 231 protruding from the second surface 2114 is provided with an air inlet 2312. The air inlet 2312 is configured to allow gas inside the housing 21 to be discharged. The accommodating portion 262 is provided with a second through hole 2621, which is in communication with the air inlet 2312.

[0415] Among them, a second through hole 2621 is set on the accommodating portion 262, and the second through hole 2621 passes through 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.

[0416] By arranging 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, thereby eliminating the 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 in discharging the gas inside the shell 21.

[0417] According to some embodiments of the present application, referring to FIG. 5 and further referring to FIG. 17 , FIG. 17 is 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 the 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 main body 261. The second wall 2623 is connected to the end of the first wall 2622 away from the main body 261. The second through hole 2621 is provided in the second wall 2623.

[0418] Among them, along the thickness direction X of the wall, the air inlet 2312 is set at the end of the valve body 231 facing the electrode assembly 22, that is, the air inlet 2312 is set on the bottom surface of the installation cavity 2311 and the valve cover 2315.

[0419] 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 .

[0420] 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 part of the valve body 231. The second wall 2623 is a wall facing the accommodating portion 262 and the air inlet 2312.

[0421] The second through hole 2621 is provided on the second wall 2623, that is, the second through hole 2621 is provided on the end of the accommodating portion 262 facing the electrode assembly 22. Of course, in other embodiments, the second through hole 2621 may also be provided on the first wall 2622, that is, the second through hole 2621 is provided on one side of the accommodating portion 262 in the radial direction of the accommodating portion 262.

[0422] 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 interior of the outer shell 21. By arranging the second through hole 2621 of the accommodating portion 262 on the first wall 2622, it is beneficial to increase the path of the gas from the second through hole 2621 into the air inlet 2312 of the valve body 231, so as to alleviate the phenomenon of the electrolyte overflowing with the gas. By arranging the second through hole 2621 of the accommodating portion 262 on the second wall 2623, it is beneficial 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.

[0423] According to some embodiments of the present application, as shown in Figures 5 and 17 , 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.

[0424] By providing the main body portion 261 and the accommodating portion 262 of the insulating member 26 as an integrally formed structure, the structural strength and stability of the accommodating portion 262 connected to the main body portion 261 are improved.

[0425] Of course, the structure of the insulating member 26 is not limited to this. The insulating member 26 may also have other structures. For example, referring to Figures 18 and 19, Figure 18 is a partial cross-sectional view of a battery cell 20 provided in some other embodiments of the present application, and Figure 19 is a partial cross-sectional view of the insulating member 26 of a battery cell 20 provided in some other embodiments of the present application. The accommodating portion 262 is provided separately from the main body 261. In other words, the accommodating portion 262 and the main body 261 are separate structures.

[0426] 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.

[0427] According to some embodiments of the present application, please continue to refer to Figures 18 and 19. In an embodiment in which the main body 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 261, and the flange portion 2624 abuts against the side of the main body 261 facing the wall portion 211.

[0428] Among them, at least 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.

[0429] In Figure 19, 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. The first wall 2622 of the accommodating portion 262 is passed through 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.

[0430] Illustratively, 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 can also be a plurality of protruding structures protruding from the outer side of the first wall 2622.

[0431] 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 part 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.

[0432] According to some embodiments of the present application, as shown in Figures 18 and 19, 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.

[0433] 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 of the assembly hole 2611, so that the flange portion 2624 can be accommodated in the accommodating groove 2612 and overlapped on the groove bottom surface of the accommodating groove 2612.

[0434] 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.

[0435] In some embodiments, please continue to refer to Figures 18 and 19. Along the thickness direction X of the wall, 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.

[0436] 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 .

[0437] 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.

[0438] 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 play a certain clamping and limiting role on the flange portion 2624, so as to reduce the phenomenon of movement of the accommodating portion 262 along the thickness direction X of the wall portion.

[0439] According to some embodiments of the present application, with reference to Figures 4, 5, and 6, and further with reference to Figures 20, 21, and 22, Figure 20 is a top view of a battery cell 20 (after removing the protective patch 29) provided in some embodiments of the present application, Figure 21 is a partial enlarged view of the battery cell 20 at point A shown in Figure 20, and Figure 22 is a schematic 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 further include a shielding member 27, which is mounted on the wall portion 211. Along the thickness direction X of the wall portion, the shielding member 27 is located on the side of the one-way valve 23 facing away from the electrode assembly 22, and the shielding member 27 covers the one-way valve 23. The one-way valve 23 has an air outlet 2313, which 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. The exhaust channel 28 connects the air outlet 2313 and the outside of the shell 21.

[0440] The shielding member 27 may be installed on the wall portion 211 in various structures. For example, the shielding member 27 may be installed on the wall portion 211 by welding, interference fit, bolt connection, clamping or bonding.

[0441] 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.

[0442] An exhaust channel 28 is formed between the shielding member 27 and the wall portion 211 or an exhaust channel 28 is provided on the shielding member 27. The exhaust channel 28 connects the air outlet 2313 and the outside of the shell 21. That is, the air 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. 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.

[0443] For example, in FIG. 21 and FIG. 22 , 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 .

[0444] 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 211, and the shielding member 27 covers the one-way valve 23, so that the shielding member 27 can play a certain protective and shielding role 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 improve 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 211 on the connection detection element and other components.

[0445] According to some embodiments of the present application, referring to Figures 4, 5 and 22, 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 provided in the mounting hole 2111, and at least a portion of the shielding member 27 is accommodated in the mounting groove 2113.

[0446] 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 .

[0447] 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 partially located in the mounting groove 2113 . For example, in FIG. 5 , the shielding member 27 is entirely located in the mounting groove 2113 .

[0448] By providing a mounting 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 mounting groove 2113, on the one hand, the space occupied by the shielding member 27 and the wall portion 211 in the thickness direction X of the wall portion can be reduced, which is beneficial to optimizing the volume of the battery cell 20. On the other hand, the mounting groove 2113 can play a certain positioning and limiting role for the shielding member 27, which is beneficial to reducing the difficulty of assembling the shielding member 27 connected to the wall portion 211.

[0449] According to some embodiments of the present application, referring to Figures 20, 21 and 22, the exhaust channel 28 includes a third exhaust gap 281, which is formed between the shielding member 27 and the side surface of the mounting groove 2113. The third exhaust gap 281 is used to connect the air outlet 2313 and the outside of the outer shell 21.

[0450] 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, in Figure 22, the exhaust channel 28 can also include a fourth exhaust gap 282. The fourth exhaust gap 282 is formed between the covering member 27 and the bottom surface of the mounting groove 2113. The fourth exhaust gap 282 connects the third exhaust gap 281 and the air outlet 2313 of the one-way valve 23.

[0451] By forming a third exhaust gap 281 that is connected to the outside of the outer shell 21 between the covering member 27 and the side surface of the installation groove 2113, the gas discharged 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 using this structure does not need to have a channel opened on the covering member 27, which is conducive to reducing processing difficulty and can improve the appearance of the battery cell 20.

[0452] It should be noted that the structure of the third exhaust gap 281 can be various. In some embodiments, as shown in Figure 21, 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 the third exhaust gap 281 is formed between the second corner surface 2113a and the first corner surface 271.

[0453] Among them, the first corner surface 271 connects the 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.

[0454] The second corner surface 2113a connects the 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.

[0455] Each first side surface 272 of the shielding member 27 abuts against and is connected to the corresponding second side surface 2113b in the groove side surface of the mounting groove 2113, so that the first corner surface 271 of the shielding member 27 faces the second corner surface 2113a in 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.

[0456] 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.

[0457] For example, in Figures 20 and 21, the shielding member 27 and the mounting groove 2113 are both rectangular structures, so that four first corner surfaces 271 are formed at the four corners of the shielding member 27, and correspondingly, four second corner surfaces 2113a are 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.

[0458] Of course, the structure of the third exhaust gap 281 formed between the shielding member 27 and the side surface of the mounting groove 2113 is not limited to this. For example, in other embodiments, refer to Figure 23, which is a schematic diagram of the structure of the shielding member 27 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 side surface of the mounting groove 2113 to form the third exhaust gap 281 between the bottom surface of the second groove 273 and the side surface of the mounting groove 2113. In this embodiment, the outer circumference of the shielding member 27 can be welded or bonded to the side surface of the mounting groove 2113. Similarly, in other embodiments, refer to Figure 24, which is a schematic 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 peripheral 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 mounting groove 2113 to form a third exhaust gap 281 between the area of ​​the shielding member 27 where the abutment portion 274 is not provided and the groove side of the mounting groove 2113. In this embodiment, the abutment portions 274 and the groove side of the mounting groove 2113 can be interference fit, welded or bonded, etc.

[0459] 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 surface 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. That is to say, 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.

[0460] According to some embodiments of the present application, as shown in FIG. 20 and FIG. 21 , the first corner surface 271 and the second corner surface 2113 a are both arc surfaces, and the radius of the first corner surface 271 is greater than the radius of the second corner surface 2113 a .

[0461] The first corner surface 271 and the second corner surface 2113a are both arcuate 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 side surface of the mounting groove 2113. Of course, in other embodiments, the first corner surface 271 may also be a surface formed at the chamfered corner of the outer peripheral surface of the shielding member 27, and the second corner surface 2113a may also be a surface formed at the chamfered corner of the side surface of the mounting groove 2113.

[0462] 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 .

[0463] By setting the first corner surface 271 and the second corner surface 2113a as arc surfaces, and the radius of the first corner surface 271 is larger 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.

[0464] In some embodiments, the first side surface 272 is connected to the second side surface 2113b by welding.

[0465] By setting the first side surface 272 and the second side surface 2113b as a structure welded to each other, it is helpful to improve the connection firmness between the shielding member 27 and the groove side surface of the installation groove 2113, thereby improving the structural stability of the shielding member 27 assembled to the wall portion 211.

[0466] In some embodiments, referring to Figures 20 and 21 , the cross-section of the shielding member 27 in the thickness direction X perpendicular to the wall portion 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 .

[0467] 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 its location, or two, three or four first corner surfaces 271 may have a third exhaust gap 281 formed at their locations.

[0468] 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.

[0469] By setting the shielding member 27 as a rectangular plate structure, the four sides of the shielding member 27 form four first side surfaces 272, and four first corner surfaces 271 are formed at the four right angles of the shielding member 27, which has a simple structure and is easy to manufacture.

[0470] According to some embodiments of the present application, as shown in Figure 22, the exhaust channel 28 may also include a fourth exhaust gap 282, which is 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 air outlet 2313.

[0471] Among them, the fourth exhaust gap 282 is formed between the blocking member 27 and the bottom surface of the mounting groove 2113. The blocking 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 blocking member 27 facing the bottom surface of the mounting groove 2113 and the bottom surface of the mounting groove 2113. Alternatively, a first groove 2751 is provided on the surface of the blocking 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.

[0472] It should be noted that in other embodiments, a first groove 2751 can be set on the bottom surface of the installation 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 installation groove 2113.

[0473] 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 air outlet 2313 to alleviate the phenomenon of exhaust obstruction between the air 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 air outlet 2313 of the one-way valve 23 to the third exhaust gap 281.

[0474] In some embodiments, referring to Figures 5 and 22, and further to Figure 25, Figure 25 is 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, shielding member 27 has a third surface 275 facing the one-way valve 23. Third surface 275 overlaps the bottom surface of the mounting groove 2113. Third surface 275 is provided with a first groove 2751. A fourth venting gap 282 is formed between the bottom surface of first groove 2751 and the bottom surface of mounting groove 2113.

[0475] 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.

[0476] 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 .

[0477] 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 a first groove 2751 on the third surface 275, a fourth exhaust gap 282 is formed between the bottom surface of the first groove 2751 and the bottom surface of the mounting groove 2113, so that the gas discharged from the air 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 abut against the bottom surface of the mounting groove 2113 and at the same time, the third exhaust gap 281 can be connected with the air outlet 2313 through the first groove 2751.

[0478] In some embodiments, referring to Figures 20, 21 and 25, a plurality of third exhaust gaps 281 are formed between the shielding member 27 and the 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.

[0479] In an embodiment in which the third exhaust gap 281 is formed between the first corner surface 271 and the second corner surface 2113a, as shown in Figure 25, 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 to the third exhaust gap 281 formed between the first corner surface 271 and the second corner surface 2113a.

[0480] 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 .

[0481] A plurality of third exhaust gaps 281 are formed between the shielding member 27 and the side surface of the mounting groove 2113 , and each third exhaust gap 281 is connected to a first groove 2751 , thereby facilitating further improvement of exhaust efficiency.

[0482] According to some embodiments of the present application, as shown in Figures 5 and 25, the third surface 275 may also be provided with a second groove 2752, a plurality of first grooves 2751 are arranged 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.

[0483] Illustratively, 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 .

[0484] 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 multiple 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 multiple first grooves 2751 and then pass through the corresponding third exhaust gaps 281 to be discharged to the outside of the 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.

[0485] In some embodiments, as shown in Figure 5, 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.

[0486] Illustratively, the entire projection of the one-way valve 23 in the thickness direction X of the wall is located within the second groove 2752 .

[0487] By arranging the air outlet 2313 of the one-way valve 23 and the second groove 2752 to face 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, 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.

[0488] According to some embodiments of the present application, as shown in FIG. 5 , along the thickness direction X of the wall portion, the shielding member 27 does not extend beyond the first surface 2112 .

[0489] 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 .

[0490] 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 mounting groove 2113 can provide a certain degree of protection for the shielding member 27, thereby further reducing the wear of the shielding member 27.

[0491] In some embodiments, please continue to refer to FIG. 5 , 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 .

[0492] 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.

[0493] It should be noted that the information code can be a QR code, barcode, numbers or text, and the information of the battery cell 20 can be obtained by scanning or manually entering 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.

[0494] In some embodiments, the shielding member 27 is fixedly connected to the wall portion 211 .

[0495] 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.

[0496] 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 is reduced, and the firmness of the connection between the shielding member 27 and the wall portion 211 can be improved, so as to facilitate the setting of information codes or connection detection elements and other components on the shielding member 27.

[0497] According to some embodiments of the present application, as shown in Figures 3 and 4, the battery cell 20 may further include a protective patch 29, which is arranged on the side of the wall 211 away from the electrode assembly 22. The protective patch 29 is provided with an information collection hole 291 that passes through 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.

[0498] The protective patch 29 is disposed on the side of the wall 211 facing away from the electrode assembly 22, that is, the protective patch 29 is disposed on the outer surface of the wall 211 to provide a certain degree of protection for the wall 211. The protective patch 29 can be made of various materials, such as rubber, silicone, or plastic.

[0499] The protective patch 29 is provided with an information collection hole 291 that penetrates the protective patch 29 . The information collection hole 291 serves to expose part of the shell 21 of the battery cell 20 , so as to facilitate setting an information code on the shell 21 or connecting a detection element for sampling.

[0500] 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.

[0501] Exemplarily, the exposed surface of the shielding member 27 corresponding to the information collection hole 291 is a plane.

[0502] Optionally, the protective patch 29 may be provided on the wall portion 211 in various structures, and the protective patch 29 may be provided on the wall portion 211 by bonding, adsorption, or the like.

[0503] It should be noted that in the embodiment where the electrode terminal 24 is provided on the wall portion 211, as shown in Figures 3 and 4, along the thickness direction X of the wall portion, the protective patch 29 is provided with a second avoidance hole 292 at the position corresponding to the electrode terminal 24. 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, each of which is used to allow one electrode terminal 24 to pass through.

[0504] In an embodiment in which a pressure relief mechanism 25 is provided on the wall portion 211, referring to Figures 3 and 4, a third avoidance hole 293 is provided on the protective patch 29 at a position corresponding to the pressure relief mechanism 25 along the thickness direction X of the wall portion. The third avoidance hole 293 passes through both sides of the protective patch 29. Along the thickness direction X of the wall portion, the projection of the pressure relief mechanism 25 is located within the third avoidance hole 293, so that the third avoidance hole 293 can avoid the pressure relief mechanism 25.

[0505] The battery cell 20 is also provided with a protective patch 29. By arranging 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 arranging 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 inside 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 for sampling, so as to reduce the sampling On the other hand, the detection elements and other components can prevent damage and pulling of the one-way valve 23. On the other hand, the aesthetics of the outer surface of the battery cell 20 can be improved. 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.

[0506] According to some embodiments of the present application, referring to FIG. 3 and further to FIG. 26 , FIG. 26 is a schematic diagram illustrating the connection between a protective patch 29 and a wall portion 211 according to some embodiments of the present application. An exhaust port 283 communicating with the exterior of the housing 21 is formed at one end of the exhaust passage 28. The protective patch 29 covers the exhaust port 283 along the thickness direction X of the wall portion.

[0507] An exhaust port 283 communicating with the exterior of the housing 21 is formed at one end of the exhaust passage 28. Specifically, the exhaust port 283 is formed at the end of the exhaust passage 28 formed between the shielding member 27 and the wall portion 211 that communicates with the exterior of the housing 21. In an embodiment where the exhaust passage 28 includes a third exhaust gap 281 and a fourth exhaust gap 282, the exhaust port 283 is formed at the end of the third exhaust gap 281 that communicates with the exterior of the housing 21.

[0508] 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 .

[0509] 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.

[0510] 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.

[0511] In some embodiments, referring to FIG. 26 and further to FIG. 27 , FIG. 27 is a schematic diagram illustrating the connection between a protective patch 29 and an adhesive layer 30 according to some embodiments of the present application. 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. The adhesive layer 30 adheres the protective patch 29 to the wall 211. A first avoidance hole 301 is provided in the adhesive layer 30 at a position corresponding to the information collection hole 291. 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.

[0512] The adhesive layer 30 serves to bond the protective patch 29 and the wall portion 211 . For example, the adhesive layer 30 may be glue or double-sided tape disposed between the protective patch 29 and the wall portion 211 .

[0513] 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 the 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.

[0514] Exemplarily, in Figure 26, 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. Correspondingly, the projection of the mounting groove 2113 and the shielding member 27 in the thickness direction X of the wall is located within 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.

[0515] 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 inside 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.

[0516] By providing an adhesive layer 30 on the side of the protective patch 29 facing the wall portion 211, the protective patch 29 can be bonded to the wall portion 211 via the adhesive layer 30, thereby reducing the difficulty of assembling the protective patch 29 and improving the stability of the connection of the protective patch 29 to the wall portion 211. Furthermore, by providing a first avoidance hole 301 at a position corresponding to the information collection hole 291 in the adhesive layer 30, and by projecting 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 portion, the first avoidance hole 301 is located. This reduces obstruction of the exhaust port 283 of the exhaust channel 28 by the adhesive layer 30, allowing gas exhausted through the exhaust channel 28 to enter the information collection hole 291 through the gap between the protective patch 29 and the wall portion 211 and then be exhausted. This allows the protective patch 29 to be bonded to the wall portion 211 while minimizing the impact on the exhaust of the one-way valve 23.

[0517] According to some embodiments of the present application, as shown in Figures 3, 4 and 26, an exhaust port 283 connected to the outside of the outer 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 the protective patch 29 covers the exhaust port 283.

[0518] 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 .

[0519] 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 so that the gas inside the outer shell 21 can be discharged.

[0520] By arranging 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, and 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.

[0521] According to some embodiments of the present application, as shown in FIG. 5 , 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 .

[0522] In the embodiment where the mounting hole 2111 is the liquid injection hole of the battery cell 20 , liquid needs to be injected into the housing 21 through the liquid injection hole before assembling the one-way valve 23 , and then the one-way valve 23 is assembled into the mounting hole 2111 .

[0523] By setting the mounting hole 2111 for assembling the one-way valve 23 as a liquid injection hole, liquid can be injected into the outer shell 21 through the mounting hole 2111 before assembling the one-way valve 23 into the mounting hole 2111, thereby eliminating the need to open a separate liquid 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.

[0524] According to some embodiments of the present application, as shown in Figures 3 and 4, the housing 21 may include a shell 212 and an end cap 213. The shell 212 has an interior formed with an accommodating cavity having an opening 2121 for accommodating the electrode assembly 22. The end cap 213 closes the opening 2121 and is a wall portion 211.

[0525] The end cover 213 is the wall portion 211 , that is, the one-way valve 23 is disposed on the end cover 213 .

[0526] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, the 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 opposite to the end cover 213, or it can be installed on the side wall of the shell 212 adjacent to and connected to the end cover 213.

[0527] By configuring the wall portion 211 of the outer shell 21 as an end cap 213 of the outer shell 21 for sealing the opening 2121 of the housing 212, a battery cell 20 employing this structure facilitates installation of the one-way valve 23 on the end cap 213, thereby reducing the difficulty of assembling the battery cell 20 and improving the production efficiency of the battery cell 20. Similarly, by configuring the wall portion 211 of the outer shell 21 as a wall of the housing 212, a battery cell 20 employing this structure can reduce the effect of stress generated when the end cap 213 and the housing 212 are connected to each other on the one-way valve 23, thereby alleviating damage to the one-way valve 23 and thereby improving the stability and service life of the battery cell 20.

[0528] According to some embodiments of the present application, as shown in Figures 3 and 4, the battery cell 20 also includes a pressure relief mechanism 25, which is arranged on the outer shell 21. The pressure relief mechanism 25 is configured to actuate and discharge 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.

[0529] The pressure relief mechanism 25 is provided on the outer shell 21 , and may be provided on the end cover 213 or on the shell 212 . For example, in FIG. 4 , the pressure relief mechanism 25 is provided on the end cover 213 .

[0530] 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 is in thermal runaway. 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.

[0531] 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 housing 21 that opens the pressure relief mechanism 25 is greater than the pressure of the gas inside the housing 21 that opens the one-way valve 23. It should be noted that when a battery cell 20 experiences thermal runaway, the gas inside the housing 21 of the battery cell 20 will rapidly surge, causing the pressure relief mechanism 25 to open and release pressure. However, during normal use of the battery cell 20, when the gas generated inside the housing 21 reaches a threshold, the one-way valve 23 can be opened, but the pressure relief mechanism 25 cannot be opened.

[0532] 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 on the housing 21 where a notched groove is provided. 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 melt, injection molding, or bonding. For example, in FIG4 , the pressure relief mechanism 25 is a separate structure from the housing 21, and the pressure relief mechanism 25 is provided on the end cover 213 of the housing 21. The pressure relief mechanism 25 can be a pressure relief component such as an explosion-proof valve, an explosion-proof disk, a pressure relief valve, or a safety valve.

[0533] For example, in Figure 4, 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 to output or input electrical energy and the pressure relief mechanism 25 used to release 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.

[0534] 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 shell 21 during normal use of the battery cell 20, it can be discharged to the outside of the shell 21 through the one-way valve 23, thereby alleviating the phenomenon of premature actuation of the pressure relief mechanism 25 for pressure relief before the thermal runaway of the battery cell 20 due to the increase in the internal air pressure of the battery cell 20, thereby effectively improving the use stability of the battery cell 20 and improving the service life and reliability of the battery cell 20.

[0535] 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 may both be disposed on the end cap 213. A battery cell 20 employing such a structure helps conserve space within the battery cell 20, thereby increasing the energy density of the battery cell 20.

[0536] In some embodiments, the one-way valve 23 and the pressure relief mechanism 25 may be disposed on different walls of the housing 21. For example, the one-way valve 23 may be disposed on the end cap 213, while the pressure relief mechanism 25 may be disposed on the housing 212. A battery cell 20 employing this structure can reduce the interaction between the one-way valve 23 and the pressure relief mechanism 25 and can be adapted to different usage environments.

[0537] In some embodiments, the exhaust rate of the one-way valve 23 is smaller than the exhaust rate of the pressure relief mechanism 25 .

[0538] 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.

[0539] According to some embodiments of the present application, with reference to FIG4 and further to FIG28 , FIG28 is a schematic diagram of a partial structure of a battery cell provided in 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 mounted on the wall portion 211. The electrode terminal 24 is used to output or input electrical energy to or from the battery cell 20. The current collecting member 31 connects the electrode terminal 24 and the electrode assembly 22. At least a portion of the current collecting member 31 is disposed between the wall portion 211 and the electrode assembly 22. The current collecting member 31 is provided with an avoidance groove 311. The one-way valve 23 extends into the avoidance groove 311 along the thickness direction X of the wall portion.

[0540] The electrode terminal 24 is disposed on the wall portion 211 , and the electrode terminal 24 is used to electrically connect to the tab 221 of the electrode assembly 22 to implement the input or output of electrical energy of the battery cell 20 .

[0541] The current collecting member 31 is disposed within the housing 21 and serves to connect the electrode terminal 24 to the tab 221 of the electrode assembly 22, thereby achieving electrical connection between the electrode terminal 24 and the electrode assembly 22. The current collecting member 31 can be made of a variety of materials, such as copper, iron, steel, or aluminum.

[0542] Exemplarily, the battery cell 20 is provided with two electrode terminals 24, and both electrode terminals 24 are mounted on the wall 211. The two electrode terminals 24 are respectively used to electrically connect to the two tabs 221 of opposite polarity of the electrode assembly 22 to realize the output or input of the positive and negative poles of the battery cell 20 respectively.

[0543] 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.

[0544] The battery cell 20 is also provided with an electrode terminal 24 for inputting or outputting electrical energy from the battery cell 20. A current collecting member 31 connects the electrode assembly 22 and the electrode terminal 24, thereby simplifying the connection between the electrode assembly 22 and the electrode terminal 24. Furthermore, by providing a clearance groove 311 in the current collecting member 31, with the one-way valve 23 extending into the clearance groove 311 in the thickness direction X of the wall portion, the clearance groove 311 allows the current collecting member 31 to clear the one-way valve 23, thereby reducing interference between the current collecting member 31 and the one-way valve 23. Furthermore, this reduces the space occupied by the one-way valve 23 and the current collecting member 31 within the housing 21, thereby facilitating an increase in the energy density of the battery cell 20.

[0545] In some embodiments, the battery cell 20 is an alkali metal battery, such as a sodium metal battery or a lithium metal battery. The alkali metal battery is used in conjunction with the one-way valve 23 to promptly discharge gas generated by the alkali metal battery during normal operation, thereby extending the service life of the alkali metal battery.

[0546] According to some embodiments of the present application, the present application further provides a battery 100 , which includes the battery cell 20 of any of the above solutions.

[0547] 2 , the battery 100 may further include a housing 10, in which the battery cells 20 are housed. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which cover each other and together define an assembly space for accommodating the battery cells 20.

[0548] Alternatively, in FIG2 , 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, with the first box body 11 covering 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 to this. In other embodiments, the first box body 11 and the second box body 12 may also be hollow structures with one end open, with the open side of the first box body 11 covering the open side of the second box body 12.

[0549] 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 rectangular parallelepiped, etc. For example, in FIG2 , the box body 10 is a rectangular parallelepiped structure.

[0550] In some embodiments, the battery cell 20 disposed in the housing 10 may be one or more. For example, in FIG2 , the housing 10 of the battery 100 includes multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a configuration in which multiple battery cells 20 are connected in both series and parallel. Multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 20 is housed in the housing 10. Alternatively, the battery 100 may be a battery module formed by first connecting multiple battery cells 20 in series, in parallel, or in a hybrid configuration, and then the multiple battery modules are further connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed in the housing 10.

[0551] The battery 100 may further include other structures. For example, the battery 100 may further include a busbar component that connects the plurality of battery cells 20 to achieve electrical connection between the plurality of battery cells 20 .

[0552] It should be noted that in some embodiments, the battery 100 may not be provided with a housing 10. The battery 100 includes multiple battery cells 20, and the battery 100 composed of multiple battery cells 20 can be directly assembled on an electrical device to provide electrical energy to the electrical device through the multiple battery cells 20. In other words, the housing 10 can serve as part of the electrical device. Taking the vehicle 1000 as an example, the housing 10 can serve as part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can form at least a portion of the floor of the vehicle 1000, or a portion of the housing 10 can form at least a portion of the crossbeam and longitudinal beam of the vehicle 1000.

[0553] According to some embodiments of the present application, the present application further provides an electrical device, which includes the battery cell 20 of any of the above solutions, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0554] The electrical device may be any of the aforementioned devices or systems using the battery cell 20 .

[0555] According to some embodiments of the present application, referring to Figures 3 to 8, 16 to 17, 20 to 22, and 25 to 27, the present application provides a battery cell 20, which includes a housing 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 housing 21 has a wall portion 211, and includes a shell 212 and an end cover 213. The interior 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 facing away from the electrode assembly 22 and a second surface 2114 facing the electrode assembly 22. The first surface 2112 is provided with a mounting groove 2113. 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 outer 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 outside of the outer shell 21. A recess 2314a is provided at one end of the valve body 2314 facing 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 facing away from the electrode assembly 22. The valve core 232 includes an elastic member 2321 and a blocking member 2322, 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. The two 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 to open the air inlet 2312 under the action of the gas inside the shell 21. A first guide column 2315b is protruded from the side of the valve cover 2315 facing the blocking member 2322, and a portion of the elastic member 2321 is sleeved on the outside of the first guide column 2315b. The diameter of the first guide column 2315b is D1, and the inner diameter of the elastic member 2321 is D2, satisfying 0mm<D2-D1≤5mm.The sealing member 2322 includes a pressing portion 2322a and a sealing portion 2322b. Along the wall thickness direction X, the ends of the elastic member 2321 respectively abut 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 and is used to seal the air inlet 2312. A second guide post 2322c is protruding from the side of the pressing portion 2322a facing the valve cover 2315. The elastic member 2321 partially sleeves over the outer side of the second guide post 2322c. The diameter of the second guide post 2322c is D3, and the inner diameter of the elastic member 2321 is D2, satisfying the condition 0 mm < D3 - D1 ≤ 5 mm. The pressing portion 2322a has a first abutting surface 2322f facing the sealing portion 2322b. The sealing portion 2322b has a second abutting surface 2322g facing the pressing portion 2322a. The first abutting surface 2322f is provided with a snap-fitting groove 2322h. The second abutting surface 2322g is provided with a snap-fitting portion 2322k, which snaps into engagement with the snap-fitting groove 2322h. Along the thickness direction X of the wall, the distance L between the first guide post 2315b and the second guide post 2322c satisfies the condition 0 mm < L ≤ 2 mm. 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 wall thickness direction X, with the first hole section 2111b located on the side of the second hole section 2111c facing away from the electrode assembly 22. The diameter of the first hole section 2111b is larger than the diameter of the second hole section 2111c. The wall surface of the first hole section 2111b serves as a first connecting surface 2111a. The valve body 231 has a connecting portion 2314c located within the first hole section 2111b. The outer peripheral surface of the connecting portion 2314c serves as a second connecting surface 2314b. The first connecting surface 2111a and the second connecting surface 2314b are both arranged around the central axis of the mounting hole 2111. The first connecting surface 2111a and the second connecting surface 2314b are welded together. The first connecting surface 2111a mates with the second connecting surface 2314b, and both the first connecting surface 2111a and the second connecting surface 2314b are arranged at an acute angle with the central axis of the mounting hole 2111. The insulating member 26 includes a main body 261 and a receiving portion 262. The main body 261 is disposed on the side of the wall 211 facing the electrode assembly 22. The receiving portion 262 is connected to the main body 261. The portion of the one-way valve 23 that extends into the interior of the housing 21 is accommodated within the receiving portion 262. The receiving portion 262 includes a first wall 2622 and a second wall 2623. The first wall 2622 surrounds the valve body 231. Along the thickness direction X of the wall, 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. The second wall 2623 is provided with a second through hole 2621, which communicates with the interior of the housing 21 of the air inlet 2312.The shielding member 27 is mounted within the mounting groove 2113 of the wall portion 211 and abuts against the bottom surface of the mounting groove 2113. Along the wall thickness direction X, the shielding member 27 is located on the side of the one-way valve 23 facing away from the electrode assembly 22. The shielding member 27 covers the one-way valve 23. An exhaust passage 28 is formed between the shielding member 27 and the wall portion 211. The exhaust passage 28 connects the gas outlet 2313 and the exterior of the housing 21. The exhaust passage 28 includes a third exhaust gap 281 and a fourth exhaust gap 282. The third exhaust gap 281 is formed between the shielding member 27 and the side surface of the mounting groove 2113. The shielding member 27 and the mounting groove 2113 have a rectangular cross-section perpendicular to the thickness direction X of the wall. The outer peripheral surface of the shielding member 27 includes four first corner surfaces 271 and four first side surfaces 272, with each pair of adjacent first side surfaces 272 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, with each pair of adjacent second side surfaces 2113b connected by a second corner surface 2113a. Each first side surface 272 abuts and is welded to the corresponding second side surface 2113b. A third exhaust gap 281 is formed between each first corner surface 271 and the corresponding second corner surface 2113a. Both the first corner surface 271 and the second corner surface 2113a are arcuate surfaces, with the radius of the first corner surface 271 being greater than the radius of the second corner surface 2113a. Along the thickness direction X of the wall, the shielding member 27 has a third surface 275 facing the one-way valve 23 and a fourth surface 276 facing away from the one-way valve 23. The third surface 275 overlaps the bottom surface of the mounting groove 2113, while the fourth surface 276 is flush with the first surface 2112. The third surface 275 is provided with four first grooves 2751. The first grooves 2751 extend radially along the shielding member 27 and penetrate one of the first corner surfaces 271. A fourth exhaust gap 282 is formed between the bottom surfaces of the first grooves 2751 and the bottom surface of the mounting groove 2113. The third surface 275 is also provided with second grooves 2752. Multiple first grooves 2751 are arranged around the second groove 2752 and communicate with the second groove 2752. The second groove 2752 communicates with the air outlet 2313. Along the wall's thickness direction (X), the air outlet 2313 is positioned facing the second groove 2752, with its projection located within the second groove 2752. A protective patch 29 is positioned on the side of the wall 211 facing away from the electrode assembly 22. The protective patch 29 is provided with an information collection hole 291 that penetrates the protective patch 29. The projection of the information collection hole 291, along the wall's thickness direction (X), is located within the shielding member 27. An exhaust port 283 is formed at one end of the exhaust channel 28, communicating with the exterior of the housing 21. Along the wall's thickness direction (X), the protective patch 29 covers the exhaust port 283.An adhesive layer 30 is provided on the side of the protective patch 29 facing the wall 211. Adhesive layer 30 bonds the protective patch 29 to the wall 211. A first escape hole 301 is provided in the adhesive layer 30 at a position corresponding to the information collection hole 291. Along the wall's thickness direction X, the projections of the mounting groove 2113 and the shielding member 27 are both located within the first escape hole 301. A pressure relief mechanism 25 is provided on the wall 211. It is configured to activate and release the internal pressure of the battery cell 20 in the event of thermal runaway. The actuation pressure of the pressure relief mechanism 25 is greater than the opening pressure of the one-way valve 23, and the exhaust rate of the one-way valve 23 is less than the exhaust rate of the pressure relief mechanism 25.

[0556] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0557] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, comprising: a housing having a wall portion; an electrode assembly housed in the housing; as well as A one-way valve is provided on the wall portion, and is used for discharging gas inside the shell.

2. The battery cell according to claim 1, wherein: The one-way valve comprises: a valve body disposed on the wall portion, wherein a mounting cavity is formed inside the valve body, and an air inlet and an air outlet are provided on the valve body, wherein the air inlet is used to communicate with the mounting cavity and the interior of the housing, and the air outlet is used to communicate with the mounting cavity and the exterior of the housing; A valve core is arranged in the installation cavity, and 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, wherein: The valve body comprises: a valve body, disposed on the wall portion, the valve body being 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, wherein: The valve cover is connected to the valve body, and the air outlet is a first through hole provided on the valve cover.

5. The battery cell according to claim 3 or 4, wherein: 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, wherein: 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, wherein: Along the thickness direction of the wall portion, the valve cover does not extend beyond an end of the valve body facing away from the electrode assembly.

8. The battery cell according to claim 7, wherein: 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, wherein: 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, wherein: The valve body and the wall portion are integrally formed.

11. The battery cell according to any one of claims 3 to 10, wherein: The valve core comprises: an elastic member, disposed in the mounting 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 to open the air inlet under the action of the gas inside the shell.

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

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

14. The battery cell according to any one of claims 11 to 13, wherein: Along the thickness direction of the wall portion, the valve cover and the blocking member are spaced apart, two ends of the elastic member respectively abut 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, wherein: A first guide column is protruded from 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, wherein: 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 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.

17. The battery cell according to claim 15 or 16, wherein: The diameter of the first guide column is D1, and the inner diameter of the elastic member is D2, satisfying the following relationship: 0mm<D2-D1≤5mm.

18. The battery cell according to any one of claims 14 to 17, wherein: 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, wherein: 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, wherein: A second guide column is protruded from 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, wherein: The diameter of the second guide column is D3, and the inner diameter of the elastic member is D2, satisfying the following relationship: 0mm<D3-D1≤5mm.

22. The battery cell according to any one of claims 14 to 21, wherein: 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, wherein: 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, wherein: 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, wherein: A plurality of limiting protrusions are convexly provided on the outer circumferential surface of the blocking member. The plurality of limiting protrusions are arranged at intervals along the circumference of the blocking member. The limiting protrusions are guided and matched with the side surfaces of the installation cavity.

26. The battery cell according to any one of claims 14 to 25, wherein: The sealing member includes a pressing 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 pressing portion. The sealing portion is connected to the side of the pressing portion away from the valve cover. The sealing portion is used to seal the air inlet.

27. The battery cell according to claim 26, wherein: 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-fit ​​groove, and the other is provided with a snap-fit ​​portion, and the snap-fit ​​portion is snap-fitted with the snap-fit ​​groove.

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

29. The battery cell according to any one of claims 26 to 28, wherein: The sealing portion is made of EPDM, fluororubber or Teflon.

30. The battery cell according to any one of claims 14 to 29, wherein: 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, wherein: The valve body is connected to the wall portion by welding.

32. The battery cell according to claim 31, wherein 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, wherein: The first connecting surface is matched with the second connecting surface, and both the first connecting surface and the second connecting surface are arranged at an acute angle to the central axis of the mounting hole.

34. The battery cell according to claim 33, wherein: 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 a 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; The hole wall surface of the first hole section is the first connecting surface, the valve body has a connecting portion located in the first hole section, 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, wherein: 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 relief groove is provided on the end surface of the valve body facing away from the electrode assembly.

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

37. The battery cell according to any one of claims 1 to 36, wherein: The battery cell further comprises: an insulating member, disposed on a side of the wall portion facing the electrode assembly; In which, 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 part 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 shell is accommodated in the accommodating portion.

38. The battery cell according to claim 37, wherein: The one-way valve includes a valve body, the valve body protruding from the second surface along the thickness direction of the wall portion, and an air inlet is provided on a portion of the valve body protruding from the second surface, 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, wherein: Along the thickness direction of the wall portion, the air inlet is provided 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 an end of the first wall away from the main body; Wherein, the second through hole is provided on the first wall and / or the second wall.

40. The battery cell according to claim 39, wherein The accommodating portion and the main body are integrally formed.

41. The battery cell according to claim 39, wherein: The accommodating portion is separately provided with the main body portion.

42. The battery cell according to claim 41, wherein The receiving portion further includes: The flange portion is connected to one 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.

43. The battery cell according to claim 42, wherein: Along the thickness direction of the wall portion, a surface of the main body portion facing the wall portion is provided with an accommodating groove, and the flange portion is accommodated in the accommodating groove.

44. The battery cell according to claim 43, wherein: 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.

45. The battery cell according to any one of claims 1 to 44, wherein: The battery cell further comprises: a shielding member mounted on the wall portion, along a thickness direction of the wall portion, the shielding member being located on a side of the one-way valve away from the electrode assembly, the shielding member covering the one-way valve; The one-way valve has an air outlet for discharging gas from the shell, an exhaust channel is formed between the shielding member and the wall or an exhaust channel is provided on the shielding member, and the exhaust channel connects the air outlet and the outside of the shell.

46. ​​The battery cell according to claim 45, wherein: 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 provided 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, wherein: 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 connect the air outlet and the outside of the housing.

48. The battery cell according to claim 47, wherein: 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, wherein 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, wherein: The first side surface is welded to the second side surface.

51. The battery cell according to any one of claims 48 to 50, wherein: The shielding member has a rectangular cross section in a direction perpendicular to the thickness of the wall portion. The outer peripheral surface of the shielding member includes four first side surfaces and four first corner surfaces. 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, wherein: The exhaust channel further includes a fourth exhaust gap 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, wherein: 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, and 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, wherein: A plurality of third exhaust gaps are formed between the shielding member and the side surface of the mounting groove, and the plurality of third exhaust gaps are arranged at intervals along the circumference of the shielding member. A plurality of first grooves are provided on the third surface, and each of the third exhaust gaps is connected to one of the first grooves.

55. The battery cell according to claim 54, wherein 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 communicated with the second groove, and the second groove is communicated with the air outlet.

56. The battery cell according to claim 55, wherein: 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, wherein: 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, wherein: 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, wherein: The shielding member is fixedly connected to the wall portion.

60. The battery cell according to any one of claims 45 to 59, wherein: The battery cell further comprises: A protective patch is provided on a side of the wall portion away from the electrode assembly. The protective patch is provided with an information collection hole that passes through the protective patch. The 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, wherein: 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.

62. The battery cell according to claim 61, wherein: The side of the protective patch facing the wall portion is provided with an adhesive layer, and the adhesive layer adheres the protective patch and the wall portion; 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.

63. The battery cell according to any one of claims 45 to 62, wherein: 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 arranged 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, wherein: 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, wherein: The housing comprises: A housing having an opening formed therein, wherein the housing is used to accommodate 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, wherein: 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 thermally runs away, wherein 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, wherein: 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, wherein: 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 and is used to output or input electrical energy from the battery cell, and 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 flow 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 comprising the battery cell according to any one of claims 1 to 68.

70. An electrical device comprising the battery cell according to any one of claims 1 to 68, wherein the battery cell is used to provide electrical energy.

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