Battery cells, batteries, and power consumption devices

Abstract

This application provides a battery cell, a battery, and a power consumption device belonging to the battery technology field. Here, the battery cell includes a housing, an electrode assembly, and a check valve. The housing has a wall, the electrode assembly is housed within the housing, and the check valve is installed in the wall and used to discharge gas from inside the housing. By installing the check valve on the wall of the housing, the check valve can be opened in one direction, allowing gas from inside the housing to be discharged to the outside of the housing. This mitigates the phenomenon where the internal pressure of the battery cell reaches a threshold prematurely due to the rise in internal pressure during normal use of the battery cell, thereby effectively improving the operational stability of the battery cell and increasing its service life and reliability.

Description

[Technical Field]

[0001] [Cross-reference of related applications] This application claims priority to Chinese Patent Application No. 2023107208122, proposed on June 16, 2023, with the title "Battery Cell, Battery and Power Consumption Device," and all contents of that application are incorporated herein by reference.

[0002] This application relates to the battery technology field, and more specifically to battery cells, batteries, and power consumption devices. [Background technology]

[0003] In recent years, new energy vehicles have developed dramatically, and in the field of electric vehicles, power batteries play an irreplaceable and crucial role as the power source for electric vehicles. With the rapid spread of new energy vehicles, the demand for power battery products is increasing day by day, and batteries, as core components of new energy vehicles, are required to have relatively high reliability and service life.

[0004] In battery technology, to ensure the safety of battery cells, a pressure relief mechanism is generally installed on the battery cell housing to release the pressure inside the battery cell. When the pressure or temperature inside the battery cell reaches a threshold, the pressure relief mechanism activates, releasing the pressure inside the battery cell. However, conventional battery cell pressure relief mechanisms may activate and release pressure prematurely during use, which can lead to relatively poor operational stability of the battery cell and is detrimental to improving the battery cell's lifespan and reliability. [Overview of the project]

[0005] The embodiments of this application provide a battery cell, a battery, and a power consumption device that can effectively improve the service life and reliability of the battery cell.

[0006] According to a first aspect, an embodiment of the present application provides a battery cell comprising a housing, an electrode assembly, and a check valve, wherein the housing has a wall, the electrode assembly is housed within the housing, the check valve is installed in the wall, and the check valve is used to discharge gas from inside the housing.

[0007] In the above proposed technology, a check valve is installed on the wall of the housing. The check valve opens in one direction, allowing gas inside the housing to be discharged to the outside. This mitigates the phenomenon where the internal pressure of the battery cell reaches a threshold prematurely due to the rise in internal pressure during normal use of the battery cell, thereby effectively improving the operational stability of the battery cell and enhancing its service life and reliability.

[0008] In some embodiments, the check valve includes a valve body and a valve core, the valve body being mounted on the wall, a mounting cavity formed inside the valve body, an intake port and an exhaust port provided on the valve body, the intake port being used to communicate the mounting cavity with the inside of the housing, the exhaust port being used to communicate the mounting cavity with the outside of the housing, the valve core being mounted inside the mounting cavity, the valve core being used to seal the intake port and to open the intake port under the action of gas inside the housing.

[0009] In the above proposed technology, the check valve is equipped with a valve body and a valve core. The valve body is mounted on the wall and has an intake port connecting the mounting cavity to the inside of the housing and an exhaust port connecting the mounting cavity to the outside of the housing. By installing the valve core inside the mounting cavity, the valve core can seal the intake port. When the pressure inside the housing rises, the gas inside the housing acts on the valve core, causing the valve core to open the intake port and thus enabling the check valve to perform a one-way exhaust function. In this way, the check valve can discharge the gas inside the housing to the outside of the housing.

[0010] In some embodiments, the valve body includes a valve body and a valve cover, the valve body being mounted on the wall, the valve body having an air intake, the valve cover being mounted along the thickness direction of the wall at the end of the valve body away from the electrode assembly, and the valve cover together with the valve body forming the mounting cavity.

[0011] In the above proposed technology, the valve body of the check valve is equipped with a valve body and a valve cover. By connecting the valve cover to the end of the valve body wall that is away from the electrode assembly in the thickness direction, the valve cover and valve body together define a mounting cavity for housing the valve core. A check valve employing such a structure facilitates the assembly of the valve core within the mounting cavity by installing the valve body in two parts, which is advantageous in reducing the difficulty of assembling the check valve.

[0012] In some embodiments, the valve cover is connected to the valve body, and the exhaust port is a first through-hole located on the valve cover.

[0013] In the above proposed technology, a first through-hole is provided on the valve cover of the valve body to form an exhaust port for the valve body. This allows the mounting cavity of the valve body to communicate with the outside of the housing through the first through-hole provided on the valve cover. A valve body employing such a structure can reduce the interference effect of the exhaust port on the connection between the valve cover and the valve body, which is advantageous in reducing the difficulty of assembling the valve cover and the valve body.

[0014] In some embodiments, the valve cover is connected to the valve body, and the exhaust port is a first exhaust gap formed between the valve cover and the valve body.

[0015] In the above proposed technology, a first exhaust gap is provided between the valve cover and the valve body to form an exhaust port for the valve body. This allows the valve body mounting cavity to communicate with the outside of the housing through the first exhaust gap formed between the valve cover and the valve body, resulting in a simple structure that is also easy to manufacture.

[0016] In some embodiments, the valve cover is connected to the valve body, and a recessed groove is provided at the end of the valve body away from the electrode assembly, with at least a portion of the valve cover housed within the recessed groove.

[0017] In the above proposed technology, a recessed groove is provided on the end of the valve body that is separated from the electrode assembly, and at least a portion of the valve cover is housed within the recessed groove. Thus, a check valve employing such a structure can save space occupied in the thickness direction of the valve body wall, improve the structural stability of the valve cover assembled on the valve body, and provide a certain level of protection to the valve cover, thereby reducing the phenomenon of wear or damage to the valve cover.

[0018] In some embodiments, along the thickness direction of the wall, the valve cover does not protrude beyond the end of the valve body away from the electrode assembly.

[0019] In the above technical solution, the valve cover is installed so as not to protrude from the end separating from the electrode assembly of the valve body in the thickness direction of the wall portion. By this, the entire valve cover is positioned within the sinking groove, thereby further saving the occupied space in the thickness direction of the wall portion of the valve body, and further improving the protective role for the valve cover, and reducing the phenomenon that the valve cover is worn or damaged.

[0020] In some embodiments, along the thickness direction of the wall portion, the wall portion has a first surface separating from the electrode assembly, and the valve body does not protrude from the first surface.

[0021] In the above technical solution, the valve body of the valve element is installed so as not to protrude from the first surface separating from the electrode assembly of the wall portion in the thickness direction of the wall portion. Thus, the valve body does not protrude from the first surface in the thickness direction of the wall portion, and while saving the occupied space in the thickness direction of the wall portion with the battery cell, it reduces the phenomenon that the valve body wears or collides with the external environment, which is advantageous for improving the protective role for the valve body and can improve the service life of the check valve.

[0022] In some embodiments, the valve cover is connected to the wall portion, and the exhaust port is a second exhaust gap formed between the valve cover and the wall portion.

[0023] In the above technical solution, by connecting the valve cover on the wall portion and making the exhaust port of the valve element be the second exhaust gap installed between the valve cover and the wall portion, the battery cell adopting such a structure can expand the space size of the mounting cavity formed between the valve cover and the valve body, improve the exhaust efficiency and exhaust smoothness of the check valve, and on the other hand, can directly form the exhaust port of the check valve between the valve cover and the wall portion, which is advantageous for reducing the phenomenon that the exhaust port is blocked by other members of the battery cell.

[0024] In some embodiments, the valve body is integrally formed with the wall portion.

[0025] In the above proposed technology, the valve body and wall of the valve are integrally molded, which is advantageous in improving the structural stability and strength of the valve body installed on the wall.

[0026] In some embodiments, the valve core includes an elastic member and a sealing member, the elastic member being installed within the mounting cavity, the sealing member being movably installed within the mounting cavity, the sealing member being used to seal the intake port under the action of the elastic member, and being used to open the intake port under the action of gas inside the housing.

[0027] In the above proposed technology, an elastic member and a sealing member are installed in the valve core of the check valve, and both the elastic member and the sealing member are installed within the mounting cavity. As a result, the elastic member can provide an elastic force to the sealing member, thereby sealing the intake port and preventing gas from outside the housing from entering the housing. Furthermore, when the pressure inside the housing rises, the gas inside the housing acts on the sealing member and overcomes the elastic force of the elastic member, thereby opening the intake port. As a result, the gas inside the housing is discharged through the check valve, enabling the check valve to discharge the gas inside the housing to the outside of the housing and preventing gas from outside the housing from entering the housing.

[0028] In some embodiments, the elastic member is a spring.

[0029] In the above proposed technology, by employing a spring as an elastic member installed within the mounting cavity, the assembly of the elastic member becomes easier, which is advantageous in reducing the difficulty of assembling the elastic member within the mounting cavity, while also ensuring that the direction in which the elastic member applies elastic force to the sealing member is relatively stable.

[0030] In some embodiments, the material of the elastic member includes steel, iron, or aluminum.

[0031] In the above proposed technology, elastic members made of steel, iron, or aluminum have relatively good toughness and can mitigate the phenomenon of elastic failure, which is advantageous in improving the service life of the elastic members.

[0032] In some embodiments, the valve cover is installed at a distance from the sealing member along the thickness direction of the wall, both ends of the elastic member abut against the valve cover and the sealing member, respectively, and the intake port is installed on the bottom surface of the mounting cavity.

[0033] In the above proposed technology, by arranging the valve cover and sealing member with a gap along the thickness direction of the wall, both ends of the elastic member abut against the valve cover and sealing member, respectively, so that the sealing member can seal the intake port located on the bottom surface of the mounting cavity along the thickness direction of the wall under the action of the elastic member. In other words, the intake port is located at the end of the valve body facing the electrode assembly in the thickness direction of the wall, and the sealing member moves along the thickness direction of the wall under the action of the elastic member, sealing the intake port. A check valve employing such a structure makes it easy for the elastic member to apply elastic force to the sealing member, thereby enabling the sealing member to seal the intake port and reducing the difficulty of assembling the elastic member.

[0034] In some embodiments, a first guide post is provided on the side of the valve cover facing the sealing member, and the portion of the elastic member is fitted onto the outside of the first guide post.

[0035] In the above technical solution, a first guide post is protrudingly provided on the side facing the sealing member of the valve cover, and a part of the elastic member is externally fitted outside the first guide post. Thus, a check valve adopting such a structure can enable the first guide post to play a role in positioning the elastic member, facilitating the assembly of the elastic member and being advantageous for reducing the assembly difficulty of the elastic member. On the other hand, when the elastic member is compressed along the thickness direction of the wall portion by the first guide post, it can play a certain guiding role to reduce the phenomenon that the elastic member deforms in the radial direction during the compression process, thereby realizing that the elastic member is stably compressed along the thickness direction of the wall portion, which is advantageous for improving the reliability of use of the elastic member, and further reducing the risk that the sealing member accidentally opens the air inlet.

[0036] In some embodiments, the valve cover is connected to the valve body, and the exhaust port is a first through hole installed on the valve cover. Here, along the thickness direction of the wall portion, the exhaust port penetrates the first guide post, or along the radial direction of the first guide post, the exhaust port is arranged at an interval from the first guide post.

[0037] In the above technical solution, by installing the exhaust port in the first through hole opened on the valve cover and enabling the first through hole to penetrate the first guide post along the thickness direction of the wall portion, the exhaust port is located inside the elastic member, which is advantageous for reducing the influence of interference caused by the exhaust port on the connection between the valve cover and the valve body. Similarly, by installing the exhaust port in the first through hole opened on the valve cover and positioning the exhaust port outside the first guide post, it is advantageous for exhaust and reduces the phenomenon that the exhaust port is sealed by the sealing member.

[0038] In some embodiments, the diameter of the first guide post is D1, the inner diameter of the elastic member is D2, and 0mm < D2 - D1 ≤ 5mm is satisfied.

[0039] In the above proposed technology, by setting the difference between the inner diameter of the elastic member and the diameter of the first guide post to be greater than 0 mm and less than or equal to 5 mm, the difference between the inner diameter of the elastic member and the diameter of the first guide post is 0 or less, thereby mitigating the phenomenon of the elastic member being difficult to assemble on the first guide post and reducing the phenomenon of friction during the process of fitting the elastic member onto the first guide post. On the other hand, if the difference between the inner diameter of the elastic member and the diameter of the first guide post is too large, the phenomenon of the gap between the elastic member and the first guide post being too large is mitigated, reducing the situation in which the elastic member rattles or deforms radially. This improves the balance of the elastic force acting on the sealing member by the elastic member and reduces the risk of the sealing member accidentally opening the air intake.

[0040] In some embodiments, a first stopper groove is provided on the side of the valve cover facing the sealing member, and the end of the elastic member away from the sealing member is inserted into the first stopper groove.

[0041] In the above proposed technology, a first stopper groove into which an elastic member is inserted is further provided on the side of the valve cover facing the sealing member. This acts as a stopper for the end of the elastic member that presses against the valve cover, reducing the phenomenon of relative radial sliding between the elastic member and the valve cover. Furthermore, it improves the balance of the elastic force acting on the sealing member by the elastic member, which is advantageous for improving the reliability of the elastic member in use.

[0042] In some embodiments, the end of the elastic member that is separated from the sealing member is fixedly connected to the valve cover.

[0043] In the above proposed technology, by fixing the end of the elastic member that is separated from the sealing member to the valve cover, and by creating a structure in which the end of the elastic member that presses against the valve cover to the valve cover is fixedly connected to each other, the stability of the elastic member pressing against the valve cover can be improved, the phenomenon of relative slippage between the elastic member and the valve cover can be reduced, and the balance of the elastic force acting on the sealing member by the elastic member can be further improved.

[0044] In some embodiments, a second guide post is protrudingly provided on the side of the sealing member facing the valve cover, and the portion of the elastic member is externally fitted outside the second guide post.

[0045] In the above technical solution, a second guide post is protrudingly provided on the side of the sealing member facing the valve cover, and the portion of the elastic member is externally fitted outside the second guide post. Thus, the check valve adopting such a structure can enable the second guide post to play a role in positioning the elastic member, facilitating the assembly of the elastic member and being advantageous for reducing the difficulty of assembling the elastic member. On the other hand, when the elastic member is compressed along the thickness direction of the wall portion by the second guide post, the second guide post can play a certain guiding role to reduce the phenomenon that the elastic member is deformed in the radial direction during the compression process, thereby realizing that the elastic member is stably compressed along the thickness direction of the wall portion, which is advantageous for improving the reliability of use of the elastic member. Furthermore, it can reduce the risk that the sealing member accidentally opens the air inlet.

[0046] In some embodiments, the diameter of the second guide post is D3, the inner diameter of the elastic member is D2, and 0 mm < D3 - D2 ≤ 5 mm is satisfied.

[0047] In the above technical solution, by setting the difference value between the inner diameter of the elastic member and the diameter of the second guide post to be greater than 0 mm and less than or equal to 5 mm, the difference value between the inner diameter of the elastic member and the diameter of the second guide post is 0 or less, thereby alleviating the phenomenon that it is difficult to assemble the elastic member on the second guide post and reducing the phenomenon of rubbing during the process of externally fitting the elastic member on the second guide post. On the other hand, by alleviating the phenomenon that the gap between the elastic member and the second guide post is too large due to the difference value between the inner diameter of the elastic member and the diameter of the second guide post being too large, the situation where the elastic member rattles or is deformed in the radial direction can be reduced, thereby improving the balance of the elastic force exerted by the elastic member on the sealing member and reducing the risk that the sealing member accidentally opens the air inlet.

[0048] In some embodiments, a second stopper groove is provided on the side of the sealing member facing the valve cover, and the end of the elastic member away from the valve cover is inserted into the second stopper groove.

[0049] In the above proposed technology, by installing a second stopper groove into which the elastic member is inserted on the side of the sealing member facing the valve cover, the end of the elastic member that presses against the sealing member acts as a stopper, reducing the phenomenon of relative radial sliding between the elastic member and the sealing member. Furthermore, it is possible to improve the balance of the elastic force that the elastic member exerts on the sealing member, which is advantageous in improving the reliability of the elastic member in use.

[0050] In some embodiments, the end of the elastic member that is separated from the valve cover is fixedly connected to the sealing member.

[0051] In the above proposed technology, by fixing the end of the elastic member that is separated from the valve cover to the sealing member, the end of the elastic member that presses against the sealing member and the sealing member are fixedly connected to each other. This improves the stability of the elastic member pressing against the sealing member, further reduces the phenomenon of relative slippage between the elastic member and the sealing member, and further improves the balance of the elastic force acting on the sealing member by the elastic member.

[0052] In some embodiments, the sealing member is installed at a distance from the cavity side of the mounting cavity.

[0053] In the above proposed technology, by installing a gap between the sealing member and the cavity side of the mounting cavity, friction between the sealing member and the cavity side of the mounting cavity is reduced when the sealing member moves along the thickness direction of the wall to open or close the air intake port. This reduces the phenomenon of the sealing member getting stuck or not moving smoothly, which is advantageous in improving the reliability of the check valve.

[0054] In some embodiments, a plurality of stopper protrusions are provided on the outer circumferential surface of the sealing member, the plurality of stopper protrusions are arranged at intervals along the circumferential direction of the sealing member, and the stopper protrusions are guided and fitted with the cavity side surface of the mounting cavity.

[0055] In the above proposed technology, multiple stopper protrusions are provided on the outer circumferential surface of the sealing member, arranged at intervals, and the stopper protrusions are guided and fitted into the cavity side surface of the mounting cavity. As a result, when the sealing member moves along the thickness direction of the wall, the fit between the stopper protrusions and the cavity side surface of the mounting cavity acts as a guide and stopper, thereby improving the stability of the sealing member's movement along the thickness direction of the wall.

[0056] In some embodiments, the sealing member includes a pressing portion and a sealing portion, wherein both ends of the elastic member abut the valve cover and the pressing portion, respectively, along the thickness direction of the wall 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 intake port.

[0057] In the above proposed technology, the sealing member is installed to include two parts, a pressing portion and a sealing portion. The pressing portion is installed on the side of the sealing portion that faces the valve cover, and the sealing portion is used to seal the intake port. Furthermore, since both ends of the elastic member abut the valve cover and the pressing portion, the elastic member can exert an elastic force on the sealing portion via the pressing portion. This is advantageous in improving the balance of the elastic force exerted by the elastic member on the sealing portion, and furthermore, it is possible to effectively improve the sealing effect of the intake port by the sealing portion.

[0058] In some embodiments, the pressing portion has a first contact surface facing the sealing portion, the sealing portion has a second contact surface facing the pressing portion, a locking groove is provided on one of the first contact surface and the second contact surface, and a locking portion is provided on the other, the locking portion engaging with the locking groove and being fitted together.

[0059] In the above technical solution, the pressing part and the sealing part have first and second abutting surfaces facing each other. A locking groove is provided on one of both the first abutting surface and the second abutting surface, and a locking part that engages and fits with the locking groove is provided corresponding to the other, thereby improving the structural stability of the sealing part installed on the pressing part, reducing the phenomenon that the sealing part slides radially with respect to the pressing part, and further being advantageous for improving the sealing effect of the intake port by the sealing part, and reducing the phenomenon that the intake port is accidentally opened.

[0060] In some embodiments, the sealing part is adhered to the pressing part.

[0061] In the above technical solution, by adopting an adhesive structure to connect the sealing part and the pressing part, it is beneficial to improve the structural stability of the sealing part connected to the pressing part, reduce the risk that the sealing part and the pressing part are separated from each other, and can improve the reliability of the sealing part sealing the intake port. On the other hand, it is easy to realize the assembly connection between the sealing part and the pressing part, which is beneficial to reducing the assembly difficulty between the sealing part and the pressing part.

[0062] In some embodiments, the material of the sealing part includes ethylene propylene rubber, fluorine rubber or Teflon.

[0063] In the above technical solution, the sealing part made of ethylene propylene rubber, fluorine rubber or Teflon has relatively good corrosion resistance, and can effectively alleviate the phenomenon that the sealing part is corroded by the electrolyte, thereby being beneficial to improving the service life of the sealing part, and reducing the phenomenon that the sealing effect of the sealing part sealing the intake port is poor after the sealing part is corroded.

[0064] In some embodiments, along the thickness direction of the wall part, the size of the gap between the valve cover and the sealing member is L, satisfying 0 mm < L ≤ 2 mm.

[0065] In the above proposed technology, by setting the size of the gap between the valve cover and the sealing member in the thickness direction of the wall to be greater than 0 mm and less than or equal to 2 mm, the barrier effect of the valve cover on the sealing member is reduced, allowing the sealing member to move along the thickness direction of the wall between the valve cover and the sealing member. This enables the sealing member to open the intake port and exhaust the gas when gas inside the housing pushes against it. At the same time, it mitigates the phenomenon where the check valve occupies too much space in the thickness direction of the wall due to an excessively large gap between the valve cover and the sealing member, which is advantageous for improving the space utilization rate of the battery cell.

[0066] In some embodiments, the valve body is welded to the wall.

[0067] In the above proposed technology, by welding the valve body and the wall together, the structural stability and strength of the connection between the valve body and the wall can be effectively improved, thereby reducing the risk of the valve body and wall detaching during use.

[0068] In some embodiments, a mounting hole is provided in the wall portion, at least a portion of the valve body is housed in the mounting hole, the wall surface of the mounting hole includes a first connecting surface, the valve body includes a second connecting surface, both the first and second connecting surfaces are positioned around the central axis of the mounting hole, and the first connecting surface is welded to the second connecting surface.

[0069] In the above proposed technology, a mounting hole for the valve body to house the valve element is provided on the wall, and the valve body has a second connecting surface, which is welded to the first connecting surface on the wall surface of the mounting hole, thereby enabling the check valve to be assembled on the wall. In both cases, the annular first connecting surface is welded to the second connecting surface, which improves the robustness of the connection between the valve body and the wall, while also improving the sealing effect between the valve body and the wall surface of the mounting hole.

[0070] In some embodiments, the first connecting surface coincides with the second connecting surface, and both the first and second connecting surfaces are positioned at an acute angle to the central axis of the mounting hole.

[0071] In the above-described technical proposal, the first and second connecting surfaces are set up in a structure that fits together, and both the first and second connecting surfaces are set at an acute angle to the central axis of the mounting hole. As a result, the first and second connecting surfaces have the same shape, are in contact with each other, and both have an inclined structure. This facilitates mutual contact between the first and second connecting surfaces when the valve body is assembled in the mounting hole, improves the degree of adhesion between the first and second connecting surfaces, is advantageous in reducing the phenomenon of gaps between the first and second connecting surfaces, and can also effectively improve the welding quality of the first and second connecting surfaces.

[0072] In some embodiments, the mounting hole includes a first hole portion and a second hole portion, the first and second hole portions are arranged along the thickness direction of the wall portion, and the first hole portion is located on the side of the second hole portion away from the electrode assembly, the hole diameter of the first hole portion is larger than the hole diameter of the second hole portion, the hole wall surface of the first hole portion is the first connection surface, the valve body has a connection portion located within the first hole portion, and the outer circumferential surface of the connection portion is the second connection surface.

[0073] In the above proposed technology, the mounting hole is provided with a first hole portion and a second hole portion arranged along the thickness direction of the wall portion. The first hole portion is located on the outside away from the electrode assembly of the second hole portion, and the diameter of the first hole portion is larger than the diameter of the second hole portion, forming a stepped hole structure mounting hole. The hole wall surface of the first hole portion is set as the first connecting surface, and the valve body has a connecting portion into which the valve body is housed. By making the outer circumferential surface of the connecting portion the second connecting surface, it is made easier to assemble the valve body of the check valve into the mounting hole from the outside of the wall portion. After the connecting portion of the valve body is housed in the first hole portion, the first connecting surface comes into contact with the second connecting surface, allowing the stepped hole structure mounting hole and the connecting portion to engage and act as a stopper and positioning mechanism for the valve body, which is advantageous in reducing the difficulty of assembling the valve body into the mounting hole.

[0074] In some embodiments, along the thickness direction of the wall, the end face of the end of the valve body away from the electrode assembly connects to the second connecting surface, and a first stress release groove is provided on the end face of the end of the valve body away from the electrode assembly.

[0075] In the above proposed technology, a first stress-relieving groove is installed on the end face of the valve body wall that is separated from the electrode assembly along the thickness direction. This first stress-relieving groove can release the welding stress caused by the mutual welding of the first and second connection surfaces. This reduces the influence of welding stress on the weld bead connecting the first and second connection surfaces, thereby reducing the risk of the weld bead cracking and further reducing the risk of seal failure at the weld bead.

[0076] In some embodiments, the first stress-relieving groove is positioned around the central axis of the mounting hole.

[0077] In the above proposed technology, by installing the first stress relief groove in an annular structure that is positioned around the central axis of the mounting hole, it is advantageous to improve the effect of absorbing welding stress through mutual welding between the first and second connection surfaces of the annular structure of the first stress relief groove, and further reduce the influence of welding stress on other components such as the valve core of the check valve.

[0078] In some embodiments, the battery cell further includes an insulating member, the insulating member being installed on the side of the wall facing the electrode assembly, wherein the wall has a second surface facing the electrode assembly along the thickness direction of the wall, the check valve protruding from the second surface, and the insulating member includes a body and a housing, the body being installed on the side of the wall facing the electrode assembly, the housing being connected to the body, and the portion of the check valve extending into the housing being housed within the housing.

[0079] In the above proposed technology, an insulating member is further installed in the battery cell, and the insulating member includes a main body and a housing that are connected to each other, the main body being installed on the side of the wall facing the electrode assembly, the main body being able to insulate the isolation wall from the electrode assembly, and the housing housing accommodating the portion of the check valve that protrudes from the second surface of the wall, thereby providing retraction and protection to the check valve, and isolating the electrode assembly from the check valve, thereby reducing the risk of short circuits between the check valve and the electrode assembly.

[0080] In some embodiments, the check valve includes a valve body, the valve body protruding from the second surface along the thickness direction of the wall, and an intake port is provided in the portion of the valve body protruding from the second surface, the intake port being configured to discharge gas from inside the housing, and the housing is provided with a second through-hole communicating with the intake port.

[0081] In the above proposed technology, by installing a second through-hole on the housing section, the second through-hole can communicate with the inside of the housing and the inside of the housing section. As a result, the intake port of the check valve body communicates with the inside of the housing through the second through-hole, and gas from inside the housing can enter the housing section through the second through-hole and then be discharged to the outside of the housing through the check valve. This eliminates the need for gas to enter the housing section through the gap between the main body and the wall and then be discharged through the check valve, which is advantageous in improving the smoothness of gas discharge by the check valve from inside the housing.

[0082] In some embodiments, along the thickness direction of the wall, the intake port is located at the end of the valve body facing the electrode assembly, and the housing includes a first wall and a second wall, the first wall being located around the valve body, one end of the first wall being connected to the main body along the thickness direction of the wall, and the second wall being connected to the end of the first wall away from the main body, where the second through-hole is located in the first wall and / or the second wall.

[0083] In the above proposed technology, the housing is provided with a first wall and a second wall connected to each other. The first wall surrounds the valve body, and the second wall is positioned at the end of the valve body facing the electrode assembly in the thickness direction of the wall. Thus, the first and second walls form a housing that accommodates the portion of the valve body that extends into the housing. By positioning the second through-hole of the housing on the first wall, it is advantageous to increase the path for gas to enter the valve body's intake port from the second through-hole, mitigating the phenomenon of electrolyte overflowing with gas. By positioning the second through-hole of the housing on the second wall, it is advantageous to realize that the intake port is positioned corresponding to the second through-hole, improving the smoothness of the check valve's discharge of gas from inside the housing.

[0084] In some embodiments, the housing portion is integrally molded with the main body portion.

[0085] In the above proposed technology, by installing the main body and housing of the insulating member in an integrally molded structure, it is advantageous to improve the structural strength and structural stability of the housing connected to the main body.

[0086] In some embodiments, the housing is installed separately from the main body.

[0087] In the above proposed technology, the main body and housing of the insulating member are installed as separate components, which is advantageous in reducing the difficulty of processing the insulating member and thus reduces the manufacturing cost of the insulating member.

[0088] In some embodiments, the housing further includes a burring portion, the burring portion being connected to the end of the first wall away from the second wall, at least a portion of the burring portion being installed stacked with the main body, and the burring portion being in contact with the side of the main body facing the wall.

[0089] In the above proposed technology, a burring section is further installed in the housing section, the burring section is connected to the end of the first wall away from the second wall, at least a portion of the burring section is installed stacked with the main body in the thickness direction of the wall section, and the burring section abuts against the side of the main body facing the wall section, thereby enabling the housing section to be connected to the main body section, resulting in a simple structure and easy assembly.

[0090] In some embodiments, a accommodating groove is provided on the surface of the main body facing the wall along the thickness direction of the wall, and the burring portion is housed within the accommodating groove.

[0091] In the above proposed technology, by installing a accommodating groove for housing the burring portion on the surface of the main body facing the wall, the space occupied in the thickness direction of the wall between the burring portion and the main body can be reduced, and the effect of interference caused by the burring portion in the mutual contact between the main body and the wall can be reduced.

[0092] In some embodiments, along the thickness direction of the wall, the surface of the burring portion facing the wall is flush with the surface of the main body portion facing the wall.

[0093] In the above proposed technology, by setting the surface of the burring section facing the wall and the surface of the main body section facing the wall to be flush with each other, the wall section and the bottom surface of the housing groove fit together, providing a certain level of clamping and stopping action to the burring section, thereby reducing the phenomenon of the housing section rattling along the thickness direction of the wall section.

[0094] In some embodiments, the battery cell further includes a shielding material, which is attached to the wall and positioned along the thickness direction of the wall on the side away from the electrode assembly of the check valve, the shielding material covers the check valve, the check valve having an exhaust port for discharging gas from inside the housing, an exhaust passage formed between the shielding material and the wall, or an exhaust passage installed on the shielding material, the exhaust passage communicating the exhaust port with the outside of the housing.

[0095] In the above proposed technology, a shielding material is further installed on the battery cell, located on the side away from the electrode assembly of the check valve. The shielding material is attached to the wall, and by covering the check valve, the shielding material can provide a certain level of protection and shielding to the check valve, reducing the phenomenon of wear or damage to the check valve in the external environment, and reducing the risk of foreign matter or particulate matter from the external environment entering the check valve, which is advantageous in improving the service life of the check valve. On the other hand, covering the check valve with the shielding material improves the aesthetic appearance of the outer surface of the battery cell, and on the other hand, it facilitates connection to other components such as detection elements on the side of the shielding material away from the check valve, thereby reducing the influence of interference from the connection of other components such as detection elements in the area on the wall where the check valve is installed.

[0096] In some embodiments, along the thickness direction of the wall, the wall has a first surface that moves away from the electrode assembly, a mounting groove is provided on the first surface, a mounting hole is provided at the bottom of the mounting groove, at least a portion of the check valve is installed in the mounting hole, and at least a portion of the shielding material is housed in the mounting groove.

[0097] In the above proposed technology, a mounting groove is provided on a first surface that is separated from the electrode assembly of the wall, and at least a portion of the shielding material is housed within the mounting groove. This reduces the space occupied by the shielding material in the thickness direction of the wall, which is advantageous for optimizing the volume of the battery cell. At the same time, the mounting groove can provide a certain positioning and stopper function for the shielding material, which is advantageous for reducing the difficulty of assembly when connecting the shielding material to the wall.

[0098] In some embodiments, the exhaust passage includes a third exhaust gap, which is formed between the shielding material and the groove side of the mounting groove, and the third exhaust gap is used to connect the exhaust port with the outside of the housing.

[0099] In the above proposed technology, a third exhaust gap communicating with the outside of the housing is formed between the shielding material and the groove side of the mounting groove. As a result, the gas discharged from the check valve can be discharged to the outside of the housing through the third exhaust gap. Battery cells employing such a structure do not require holes to be drilled in the shielding material, which is advantageous in reducing the difficulty of processing and improving the aesthetic appearance of the battery cell.

[0100] In some embodiments, the outer circumferential surface of the shielding material includes a first corner surface and at least two first side surfaces, the first corner surface being connected to 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 being connected to two adjacent second side surfaces, each second side surface being connected to one of the first side surfaces; and the third exhaust gap is formed between the second corner surface and the first corner surface.

[0101] In the above proposed technology, two adjacent first sides on the outer periphery of the shielding material are connected by a first corner surface, and two connected second sides on the groove side of the mounting groove are connected by a second corner surface, each first side is connected to one second side, and a third exhaust gap is formed between the first corner surface and the second corner surface. In other words, by forming a third exhaust gap at the corner between the shielding material and the mounting groove, it is made easier to form a third exhaust gap between the outer periphery of the shielding material and the groove side of the mounting groove, resulting in a simple structure and easy implementation. At the same time, it is advantageous to improve the connection area between the outer periphery of the shielding material and the groove side of the mounting groove, and is advantageous to improve the robustness of the shielding material when it is connected to the wall.

[0102] In some embodiments, both the first and second corner surfaces are arcuate surfaces, and the radius of the first corner surface is greater than the radius of the second corner surface.

[0103] In the above proposed technology, both the first and second corner surfaces are positioned on arcuate surfaces, and the radius of the first corner surface is made larger than the radius of the second corner surface, thereby creating a third exhaust gap between the first and second corner surfaces. This results in a simple structure that is easy to manufacture and process.

[0104] In some embodiments, the first side is welded to the second side.

[0105] In the above proposed technology, by installing a structure in which the first side and the second side are welded to each other, it is advantageous to improve the robustness of the connection between the shielding material and the groove side of the mounting groove, and improve the structural stability of the shielding material assembled on the wall.

[0106] In some embodiments, the cross-section of the shielding material perpendicular to the thickness direction of the wall portion is rectangular, and the outer surface of the shielding material includes four first sides and four first corner surfaces, with the third exhaust gap formed in at least one of the first corner surfaces.

[0107] In the above proposed technology, by installing the shielding material in a rectangular plate-like structure, the four sides of the shielding material form four first sides, and the four right angles of the shielding material form four first corner surfaces, resulting in a simple structure and easy manufacturing.

[0108] In some embodiments, the exhaust passage further includes a fourth exhaust gap, the fourth exhaust gap being formed between the shielding material and the bottom surface of the mounting groove, and the fourth exhaust gap being in communication with the third exhaust gap and the exhaust port.

[0109] In the above proposed technology, the exhaust passage further includes a fourth exhaust gap formed between the shielding material and the bottom surface of the mounting groove, and the fourth exhaust gap communicates with the third exhaust gap and the exhaust port, thereby mitigating the phenomenon in which exhaust between the exhaust port and the third exhaust gap is obstructed after the shielding material comes into contact with the bottom surface of the mounting groove, and thereby improving the smoothness of gas discharge from the exhaust port of the check valve to the third exhaust gap.

[0110] In some embodiments, the shielding material has a third surface facing the check valve along the thickness direction of the wall, the third surface overlaps the bottom surface of the mounting groove, a first groove is provided on the third surface, and the fourth exhaust gap is formed between the bottom surface of the first groove and the bottom surface of the mounting groove.

[0111] In the above proposed technology, the third surface of the shielding material is overlapped with the bottom surface of the mounting groove, causing the shielding material to contact the bottom surface of the mounting groove and improving the structural stability and reliability of the shielding material being installed in the mounting groove. Furthermore, by installing the first groove on the third surface, a fourth exhaust gap is formed between the bottom surface of the first groove and the bottom surface of the mounting groove. As a result, the gas discharged from the exhaust port of the check valve enters the third exhaust gap via the first groove and is then discharged to the outside of the housing, thereby enabling the shielding material to contact the bottom surface of the mounting groove, while simultaneously enabling communication between the third exhaust gap and the exhaust port via the first groove.

[0112] In some embodiments, a plurality of the third exhaust gaps are formed between the shielding material and the groove side surface of the mounting groove, the plurality of the third exhaust gaps are spaced apart along the circumferential direction of the shielding material, a plurality of the first grooves are provided on the third surface, and each of the third exhaust gaps communicates with one of the first grooves.

[0113] The above proposed technology is advantageous in further improving exhaust efficiency by forming multiple third exhaust gaps between the shielding material and the groove side of the mounting groove, and by having each third exhaust gap communicate with one first groove.

[0114] In some embodiments, a second groove is further provided on the third surface, and a plurality of the first grooves are provided around the second groove, each communicating with the second groove, and the second groove communicates with the exhaust port.

[0115] In the above proposed technology, a second groove is provided on the third surface of the shielding material facing the check valve, the second groove communicates with the exhaust port of the check valve, and a plurality of first grooves are provided around the second groove, all of which communicate with the second groove. As a result, the gas discharged from the exhaust port of the check valve enters the second groove and then passes through the plurality of first grooves to the corresponding third exhaust gaps and is discharged to the outside of the housing. This is advantageous for improving exhaust efficiency and can mitigate the phenomenon of gas accumulating between the shielding material and the check valve.

[0116] In some embodiments, along the thickness direction of the wall, the exhaust port is located at the end of the check valve away from the electrode assembly, the exhaust port is located facing the second groove, and the projection of the exhaust port is located within the second groove.

[0117] In the above proposed technology, the exhaust port of the check valve and the second groove are installed facing each other, and the projection of the wall portion of the exhaust port in the thickness direction is positioned within the second groove. As a result, the second groove covers the exhaust port in the thickness direction of the wall portion, allowing the gas discharged from the exhaust port of the check valve to enter the second groove directly, which is advantageous for improving exhaust smoothness and exhaust efficiency.

[0118] In some embodiments, the shielding material does not protrude beyond the first surface along the thickness direction of the wall.

[0119] In the above proposed technology, by installing the shielding material so that it does not protrude beyond the first surface that is separated from the electrode assembly in the wall in the thickness direction of the wall, the mounting groove provides a certain level of protection to the shielding material, further reducing the wear phenomenon of the shielding material.

[0120] In some embodiments, the shielding material has a fourth surface that is away from the check valve, and the fourth surface is flush with the first surface.

[0121] In the above proposed technology, by installing the fourth surface of the shielding material away from the check valve and the first surface away from the electrode assembly of the wall portion in a structure that is flush with each other, it is advantageous to further improve the aesthetic appearance of the outer surface of the battery cell, and it also facilitates the installation of an information code on the fourth surface of the shielding material or connection to other components such as a detection element.

[0122] In some embodiments, the shielding material is fixedly connected to the wall.

[0123] In the above proposed technology, by installing the shielding material in a structure that is fixedly connected to the wall, it is advantageous in reducing the risk of the shielding material detaching from the wall during use, and the robustness of the connection between the shielding material and the wall is improved, making it easier to install information codes on the shielding material or connect them to other components such as detection elements.

[0124] In some embodiments, the battery cell further includes a protective sheet, the protective sheet being positioned on the side of the wall away from the electrode assembly, an information collection hole being provided on the protective sheet and penetrating the protective sheet, and the projection of the information collection hole in the thickness direction of the wall located within the shielding material.

[0125] In the above proposed technology, a protective sheet is further installed on the battery cell. By installing the protective sheet on the side away from the electrode assembly on the wall, it can serve to protect the wall. Furthermore, by installing information collection holes on the protective sheet and positioning the projection of the information collection holes in the thickness direction of the wall within the shielding material, the information collection holes are installed in correspondence with the shielding material. This facilitates the installation of information codes on the shielding material or connection to components such as detection elements for sampling, thereby reducing damage and pulling to the check valve by the sampled components such as detection elements, while also improving the aesthetic appearance of the battery cell's outer surface. On the other hand, by installing the information collection holes of the shielding material and the protective sheet in correspondence, the area from which the battery cell is exhausted via the check valve can be positioned in correspondence with the area where the information collection holes of the protective sheet are installed. This saves space occupied on the outer surface of the housing by the information collection holes and the shielding material, which is advantageous for improving the degree of integration of the battery cell.

[0126] In some embodiments, an exhaust port communicating with the outside of the housing is formed at one end of the exhaust passage, and the protective sheet covers the exhaust port.

[0127] In the above proposed technology, by installing a protective sheet in a structure that covers the exhaust port at one end of the exhaust passage formed between the shielding material and the wall, the protective sheet can act as a shield for the exhaust passage, improving the aesthetic appearance of the battery cell's exterior. At the same time, it can reduce the risk of foreign matter or particulate matter from the external environment entering the exhaust passage through the exhaust port and blocking the passage, which is advantageous for improving the reliability of the battery cell's operation.

[0128] In some embodiments, an adhesive layer is provided on the side of the protective sheet facing the wall portion to bond the protective sheet to the wall portion, and a first retraction hole is provided in the adhesive layer at a position corresponding to the information collection hole, and along the thickness direction of the wall portion, the projections of both the information collection hole and the exhaust port are located within the first retraction hole.

[0129] In the above proposed technology, by installing an adhesive layer on the side of the protective sheet facing the wall, the protective sheet can be bonded to the wall via the adhesive layer, which is advantageous in reducing the difficulty of assembling the protective sheet and improving the connection stability of the protective sheet when it is installed on the wall. Furthermore, by installing a first retraction hole at a position corresponding to the information collection hole in the adhesive layer, and positioning both the projection of the information collection hole of the protective sheet and the exhaust port formed at one end of the exhaust passage in the thickness direction of the wall within the first retraction hole, the barrier of the exhaust passage of the adhesive layer to the exhaust port is reduced. As a result, the gas discharged through the exhaust passage passes through the gap between the protective sheet and the wall and enters the information collection hole before being discharged, thereby enabling the protective sheet to be bonded to the wall while simultaneously reducing the impact of the check valve on the exhaust.

[0130] In some embodiments, an exhaust port is formed at one end of the exhaust passage, communicating with the outside of the housing, the battery cell further includes a protective sheet, the protective sheet is installed on the side of the wall away from the electrode assembly, and the protective sheet covers the exhaust port.

[0131] In the above proposed technology, a protective sheet is installed on the side of the wall away from the electrode assembly, and the protective sheet covers the exhaust port at one end of the exhaust passage formed between the shielding material and the wall. This acts as a shield for the exhaust passage, improving the aesthetic appearance of the battery cell's exterior. At the same time, it reduces the risk of foreign matter or particulate matter from the external environment entering the exhaust passage through the exhaust port and blocking it, which is advantageous for improving the reliability of the battery cell's operation.

[0132] In some embodiments, mounting holes are provided in the wall portion, and at least a portion of the check valve is mounted within the mounting holes, which are the liquid injection holes of the battery cell.

[0133] In the above proposed technology, by installing the mounting hole for assembling the check valve in the liquid injection hole, liquid can be injected into the housing through the mounting hole before assembling the check valve in the mounting hole. This eliminates the need to drill a separate liquid injection hole on the housing, which is advantageous for improving the production efficiency of battery cells and for reducing the manufacturing cost of battery cells.

[0134] In some embodiments, the housing includes a case and an end cap, wherein a housing cavity having an opening is formed inside the case, the housing cavity is used to house the electrode assembly, and the end cap seals the opening, wherein the end cap is the wall portion, or the case includes the wall portion.

[0135] In the above proposed technology, by installing the housing wall onto the end cap that seals the opening of the housing case, battery cells employing such a structure facilitate the installation of a check valve on the end cap, which is advantageous in reducing the difficulty of assembly in the battery cell and improving the production efficiency of the battery cell. Similarly, by installing the housing wall onto one wall of the case, battery cells employing such a structure reduce the impact of the stress generated when the end caps are connected to each other in the case on the check valve, which can mitigate phenomena such as check valve damage, and further improve the operational stability and service life of the battery cell.

[0136] In some embodiments, the battery cell further includes a pressure relief mechanism, which is installed in the housing and is configured to operate in the event of thermal runaway of the battery cell to release pressure inside the battery cell, wherein the operating pressure of the pressure relief mechanism is greater than the opening pressure of the check valve.

[0137] In the above proposed technology, by setting the opening pressure at which the check valve releases exhaust to be lower than the operating pressure at which the pressure relief mechanism releases pressure, when gas is generated inside the housing during normal use of the battery cell, it is discharged to the outside of the housing through the check valve. This increases the internal pressure of the battery cell, which can mitigate the premature operation of the pressure relief mechanism before thermal runaway of the battery cell. Furthermore, it can effectively improve the operational stability of the battery cell, thereby improving its service life and reliability.

[0138] In some embodiments, the exhaust rate of the check valve is smaller than the exhaust rate of the pressure relief mechanism.

[0139] In the above proposed technology, by setting the exhaust rate of the check valve to be lower than the exhaust rate of the pressure relief mechanism, it is possible to mitigate the phenomenon in which the pressure relief mechanism cannot be activated and released due to the exhaust of the check valve being too fast when thermal runaway occurs in the battery cell. As a result, the pressure relief mechanism can be activated when thermal runaway occurs in the battery cell, and the internal pressure of the battery cell can be released stably, which is advantageous in reducing the risk of the battery cell igniting or exploding when thermal runaway occurs.

[0140] In some embodiments, along the thickness direction of the wall, the wall has a second surface facing the electrode assembly, the check valve protrudes from the second surface, the battery cell further includes electrode terminals and a current collector, the electrode terminals are attached to the wall and are used to output or input electrical energy of the battery cell, the current collector is connected to the electrode terminals and the electrode assembly, at least a portion of the current collector is installed between the wall and the electrode assembly, the current collector has a retraction groove, and the check valve extends into the retraction groove along the thickness direction of the wall.

[0141] In the above proposed technology, the battery cell is further equipped with electrode terminals for inputting or outputting electrical energy from the battery cell, and a current collector is connected to the electrode assembly and electrode terminals, thereby reducing the difficulty of connecting the electrode assembly and electrode terminals by the current collector. Furthermore, by providing a retraction groove on the current collector and having the check valve extend into the retraction groove in the thickness direction of the wall, the retraction groove allows the current collector to retract the check valve, thereby reducing the effects of interference between the current collector and the check valve, while saving the space occupied inside the housing between the check valve and the current collector, which is advantageous for improving the energy density of the battery cell.

[0142] According to a second aspect, embodiments of the present application further provide a battery which includes the above-described battery cell.

[0143] According to a third aspect, an embodiment of the present application further provides a power consumption device comprising the above-mentioned battery cell, the battery cell being used to provide electrical energy.

[0144] To more clearly illustrate the technical concept of the embodiments of this application, the following is a brief introduction to the drawings that may be used in the embodiments. It should be understood that these drawings only illustrate a few embodiments of this application and should not be considered limiting to the scope. Those skilled in the art can, without any creative effort, obtain other relevant drawings based on these. [Brief explanation of the drawing]

[0145] [Figure 1] This is a schematic diagram of the structure of a vehicle according to several embodiments of this application. [Figure 2] This is an exploded view of the structure of a battery according to several embodiments of this application. [Figure 3] This is a schematic diagram of the structure of a battery cell according to several embodiments of this application. [Figure 4] This is an exploded view of the structure of a battery cell according to several embodiments of this application. [Figure 5]This is a local cross-sectional view of a battery cell according to several embodiments of this application. [Figure 6] This is a schematic diagram of the structure of a check valve according to several embodiments of this application. [Figure 7] This is an exploded view of the structure of a check valve according to several embodiments of this application. [Figure 8] This is a cross-sectional view of a check valve according to several embodiments of this application. [Figure 9] This is a schematic diagram of the structure of a check valve according to several other embodiments of this application. [Figure 10] This is a local cross-sectional view of a battery cell according to several other embodiments of this application. [Figure 11] This is a schematic diagram of the structure of a check valve according to some further embodiments of this application. [Figure 12] This is a cross-sectional view of a check valve according to some further embodiments of the present application. [Figure 13] This is a cross-sectional view of a check valve according to some other embodiments of the present application. [Figure 14] This is a cross-sectional view of a check valve according to yet another embodiment of the present application. [Figure 15] This is a schematic diagram of the structure of a sealing member for a check valve according to yet another embodiment of this application. [Figure 16] This is a local cross-sectional view of the wall portion of a battery cell housing according to several embodiments of this application. [Figure 17] This is a local cross-sectional view of an insulating member of a battery cell according to several embodiments of this application. [Figure 18] This is a local cross-sectional view of a battery cell according to some further embodiments of this application. [Figure 19] This is a local cross-sectional view of an insulating member of a battery cell according to some further embodiments of this application. [Figure 20] This is a plan view of a battery cell (after the protective sheet has been removed) according to some embodiments of this application. [Figure 21] This is a localized magnified view of point A in the battery cell shown in Figure 20. [Figure 22]This is a schematic diagram showing the connection between the shielding material and the wall portion of a battery cell according to some embodiments of this application. [Figure 23] This is a schematic diagram of the structure of another embodiment of the shielding material according to some embodiments of this application. [Figure 24] This is a schematic diagram of the structure in some other embodiments of the shielding material according to some embodiments of this application. [Figure 25] This is a bottom view of a battery cell shielding material according to some embodiments of this application. [Figure 26] This is a schematic diagram illustrating the connection between the protective sheet and the wall according to several embodiments of this application. [Figure 27] This is a schematic diagram of the connection between the protective sheet and the adhesive layer according to some embodiments of this application. [Figure 28] This is a schematic diagram of the local structure of a battery cell according to some embodiments of this application. [Modes for carrying out the invention]

[0146] To clarify the purpose, technical proposal, and advantages of the embodiments of this application, the following clearly describes the technical proposal in the embodiments of this application, linking it with the drawings of the embodiments. Clearly, the embodiments described are only some, not all, embodiments of this application. All other embodiments derived from the embodiments of this application without the creative effort of a person skilled in the art are all within the scope of protection of this application.

[0147] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as that commonly understood by those skilled in the art relating to this application. In this application, terms used in the specification are solely for the purpose of describing specific embodiments and are not intended to limit this application. The terms “includes” and “have,” and any variations thereof, in the description of the specification, claims, and drawings of this application are intended to intentionally cover the non-exclusive “includes.” Terms such as “first,” “second,” etc., in the specification, claims, or drawings of this application are not intended to describe a particular order or hierarchical relationship, but to distinguish different subjects.

[0148] The “Examples” as used in this application mean that certain features, structures, or characteristics described in conjunction with the Examples may be included in at least one Example of this application. The occurrence of this phrase in each location in the specification does not necessarily refer to the same Example, nor does it mean that each Example is mutually exclusive or alternative to the others.

[0149] In the description of this application, unless otherwise specifically defined or limited, the terms “attachment,” “connection,” “connection,” and “installation” should be understood in a broad sense. For example, a fixed connection may be a detachable connection, an integral connection, a direct connection, an indirect connection via an intermediate medium, or internal communication between two elements. A person skilled in the art will be able to understand the specific meaning of these terms in this application depending on the specific circumstances.

[0150] In this application, the terms "and / or" merely describe the relationship between related objects, indicating that three relationships are possible. For example, A and / or B may represent three cases: A alone, a combination of A and B, and B alone. In this application, the character " / " generally indicates that the preceding and succeeding related objects are in an "or" relationship.

[0151] 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 are omitted in different embodiments. It should be understood that the dimensions such as thickness, length, and width of various components in the embodiments of this application shown in the drawings, and the overall dimensions such as thickness, length, and width of the integrated device, are illustrative and should not constitute any limitation to this application.

[0152] The term "multiple" as it appears in this application refers to two or more (including two).

[0153] In the embodiments of this application, the battery cell may be a secondary battery, which is a battery cell that can be used continuously by activating the active material through charging after the battery cell has been discharged.

[0154] The battery cell may be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to these.

[0155] A battery cell generally includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator member. During charging and discharging of the battery cell, active ions (e.g., lithium ions) move back and forth between the positive and negative electrodes, undergoing intercalation and deintercalation. The separator member is placed between the positive and negative electrodes and can prevent short circuits between them while allowing active ions to pass through.

[0156] In some embodiments, the positive electrode may be a positive electrode plate, which may include a positive electrode current collector and a positive electrode active material placed on at least one surface of the positive electrode current collector.

[0157] For example, a positive electrode current collector has two opposing surfaces in the direction of its own thickness, and the positive electrode active material is placed on one or both of the two opposing surfaces of the positive electrode current collector.

[0158] For example, the positive electrode current collector may be a metal foil sheet or a composite current collector. For example, as the metal foil sheet, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium can be used. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector may be formed by forming a metal material (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy) on a polymer material substrate (for example, a substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0159] For example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphate, lithium transition metal oxide, and their respective reformed compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used individually or in combination of two or more. Here, examples of lithium-containing phosphates may include, but are not limited to, at least one of the following: lithium iron phosphate (e.g., LiFePO4 (which may be abbreviated as LFP)), composite materials of lithium iron phosphate and carbon, lithium manganese phosphate (e.g., LiMnPO4), composite materials of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and composite materials of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides include lithium cobalt oxide (e.g., LiCoO2), lithium nickel oxide (e.g., LiNiO2), lithium manganese oxide (e.g., LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (e.g., LiNi 1 / 3 Co 1 / 3 Mn 1 / 3 O2(NCM 333 (It may also be abbreviated as LiNi) 0.5 Co 0.2 Mn 0.3O2 (which may be abbreviated as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which may be abbreviated as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which may be abbreviated as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which may be abbreviated as NCM 811 ), lithium nickel cobalt aluminum oxide (for example, LiNi 0.85 Co 0.15 Al 0.05 O2) and may include, but is not limited to, at least one of its modified compounds.

[0160] In some embodiments, the positive electrode may employ a foamed metal. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When the foamed metal is used as the positive electrode, it is not necessary to provide a positive electrode active material on the surface of the foamed metal. Of course, a positive electrode active material may also be provided. As an example, the foamed metal may be filled or / and deposited with a lithium source material, potassium metal, or sodium metal, and the lithium source material is lithium metal and / or a lithium-rich material.

[0161] In some embodiments, the negative electrode may be a negative electrode plate, and the negative electrode plate may include a negative electrode current collector.

[0162] For example, the negative electrode current collector can be a metal foil sheet, foamed metal, or a composite current collector. For example, as the metal foil sheet, aluminum or stainless steel surface-treated with silver, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium can be used. The foamed metal may be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector may be formed by forming a metal material (such as copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys) on a polymer material substrate (for example, a substrate such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, or polyethylene).

[0163] For example, the negative electrode plate may include a negative electrode current collector and a negative electrode active material placed on at least one surface of the negative electrode current collector.

[0164] For example, the negative electrode current collector has two opposing surfaces in the thickness direction of itself, and the negative electrode active material is placed on one or both of the two opposing surfaces of the negative electrode current collector.

[0165] For example, the negative electrode active material can be a negative electrode active material known in the art for use in battery cells. For example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicone-based materials, tin-based materials, and lithium titanate. The silicone-based material may be selected from at least one of elemental silicone, silicone oxide, silicone-carbon composite, silicone-nitrogen composite, and silicone alloy. The tin-based material may be selected from at least one of elemental tin, tin oxide, and tin alloy. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used individually or in combination of two or more.

[0166] 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.

[0167] In some embodiments, the electrode assembly further includes a separator member placed between the positive and negative electrodes.

[0168] In some embodiments, the separator member is a separator. The type of separator may vary, and any known porous separator with good chemical and mechanical stability may be selected.

[0169] For example, the separator material may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multilayer composite film. If the separator is a multilayer composite film, the materials of each layer may be the same or different. The separator member may be a single member positioned between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0170] In some embodiments, the separator component is a solid electrolyte. The solid electrolyte is placed between the positive and negative electrodes and plays a role in ion transport and isolation of the positive and negative electrodes.

[0171] In some embodiments, the battery cell further includes an electrolyte that plays a role in conducting ions between the positive and negative electrodes. The electrolyte may be liquid, gel-like, or solid. Here, a liquid electrolyte comprises an electrolyte salt and a solvent.

[0172] In some embodiments, the electrolyte salt may contain at least one of the following: lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluoro(oxalato)borate, lithium bis(oxalato)borate, lithium difluorobis(oxalato)phosphate, and lithium tetrafluoro(oxalato)phosphate.

[0173] In some embodiments, the solvent may include at least one of the following: ethylene carbonate, propylene carbonate, ethyl methyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butylene carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, ethyl methyl sulfone, and diethyl sulfone. The solvent may also be an ether-based solvent. The ether solvent may include one or more of the following: ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, diethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyltetrahydrofuran, diphenyl ether, and crown ether.

[0174] Here, the gel-like electrolyte contains a polymer-based skeletal network and is combined with an ionic liquid-lithium salt.

[0175] Here, the solid electrolyte includes polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0176] For example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymer, polyionic liquid lithium salt, cellulose, etc.

[0177] For example, inorganic solid electrolytes may include one or more of oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), sulfide solid electrolytes (crystalline lithium superionic conductor (lithium germanium phosphate sulfur, argyrodite), amorphous sulfide), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0178] For example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0179] In some embodiments, the electrode assembly is a wound structure. The positive electrode plate and the negative electrode plate are wound into the wound structure.

[0180] In some embodiments, the electrode assembly has a layered structure.

[0181] For example, multiple positive and negative electrodes may be installed, and these multiple positive and negative electrodes may be stacked alternately.

[0182] For example, multiple positive electrodes may be installed, and the negative electrodes may be folded and stacked to form multiple folded segments, with one positive electrode sandwiched between adjacent folded segments.

[0183] For example, both the positive and negative plates are folded and stacked to form multiple folded segments.

[0184] For example, multiple separator members may be installed, each placed between any adjacent positive or negative electrode plates.

[0185] For example, separator members can be installed continuously, folded or wound, between adjacent positive or negative plates.

[0186] In some embodiments, the shape of the electrode assembly may be cylindrical, flattened, or polygonal prism-shaped.

[0187] In some embodiments, the electrode assembly is provided with tabs from which current can be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0188] In some embodiments, the battery cell may include a housing. The housing is used to package components such as electrode assemblies and electrolytes. The housing may be a steel case, an aluminum case, a plastic case (e.g., polypropylene), a composite metal case (e.g., a copper-aluminum composite housing), or an aluminum film.

[0189] For example, a battery cell may be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of another shape. A prismatic battery cell includes, but is not limited to, a prismatic housing battery cell, a blade-type battery cell, or a polygonal prism battery. A polygonal prism battery is, for example, a hexagonal battery.

[0190] The batteries referred to in the embodiments of this application refer to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0191] In some embodiments, the battery may be a battery module, and if there are multiple battery cells, the multiple battery cells are fixed side by side to form a battery module.

[0192] In some embodiments, the battery may be a battery pack, which includes a housing and battery cells, and the battery cells or battery modules are housed in the housing.

[0193] In some embodiments, the housing can be part of the vehicle's chassis structure. For example, a portion of the housing may be at least part of the vehicle's floor, or a portion of the vehicle's cross members and side members.

[0194] In some embodiments, the battery may be an energy storage device. The energy storage device may include an energy storage container, an energy storage electrical cabinet, and the like.

[0195] Batteries possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide application range, and low self-discharge coefficient, making them a crucial component in the development of new energy sources. The advancement of battery technology requires simultaneous consideration of a wide range of design factors, such as energy density, cycle life, discharge capacity, and charge / discharge ratio, as well as battery safety. With the rapid development and increasing demand for batteries, the demand for battery life and reliability is also rising accordingly.

[0196] In battery technology, to ensure the safety of a typical battery cell, a pressure release mechanism is generally installed on the battery cell housing. By releasing the internal pressure of the battery cell through this mechanism, the safety of the battery cell can be effectively improved. However, in related technologies, a certain amount of gas is generated during use, which can increase the air pressure inside the battery cell housing. This can cause the pressure release mechanism to activate prematurely during use, resulting in relatively poor battery cell stability and negatively impacting the battery cell's lifespan and reliability.

[0197] Based on the above considerations, in order to solve the problem of the relatively short service life and relatively low reliability of battery cells, an embodiment of the present application provides a battery cell comprising a housing, an electrode assembly, and a check valve, wherein the housing has a wall portion, the electrode assembly is housed within the housing, the check valve is installed in the wall portion, and the check valve is used to discharge gas from inside the housing.

[0198] In a battery cell with this structure, a check valve is installed on the wall of the housing. The check valve opens in one direction, allowing gas inside the housing to be discharged to the outside. This means that when gas is generated inside the housing during normal use of the battery cell, it is discharged to the outside through the check valve, mitigating the phenomenon of premature release of operating pressure in the battery cell caused by the internal pressure rising and reaching the threshold early. Furthermore, this effectively improves the operational stability of the battery cell, thereby improving its service life and reliability.

[0199] The battery cells disclosed in the embodiments of this application can be used in power-consuming devices such as vehicles, ships, or aircraft, but are not limited to these, and may also be used in energy storage devices. The power supply system of such power-consuming devices can be configured using the battery cells, batteries, etc., disclosed in this application, which is advantageous in mitigating the phenomenon of battery cells opening prematurely and releasing pressure during use, thereby improving the service life and reliability of the battery cells.

[0200] Embodiments of this application provide a power consumption device that uses a battery as a power source, which may be, but is not limited to, a mobile phone, tablet, laptop computer, electric toy, power tool, battery car, electric vehicle, steamship, or aerospace aircraft. Here, electric toys may include stationary or mobile electric toys, such as game consoles, electric vehicle toys, electric steamship toys and electric airplane toys, and aerospace aircraft may include airplanes, rockets, space shuttles and spacecraft.

[0201] In the following embodiments, for the sake of explanation, we will use a vehicle as an example of the power consumption device in one embodiment of this application.

[0202] Referring to Figure 1, which is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of the present application, the vehicle 1000 may be a fuel oil vehicle, a gas vehicle, or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or a range extender vehicle. A battery 100 is installed inside the vehicle 1000, and the battery 100 may be installed at the bottom, head, or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 can be the operating power source for the vehicle 1000. The vehicle 1000 may further 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, to meet the operating power consumption requirements for starting the vehicle 1000, navigation, and driving.

[0203] In some embodiments of this application, the battery 100 can provide driving power to the vehicle 1000 not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, in place of or in place of fuel oil or natural gas.

[0204] Referring to Figure 2, Figure 2 is an exploded view of the structure of a battery 100 according to some embodiments of the present application. The battery 100 may include a housing 10 and battery cells 20 housed within the housing 10.

[0205] Here, the housing 10 is used to provide assembly space for the battery cell 20, and the housing 10 can employ various structures. In some embodiments, the housing 10 may include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 overlap each other, and the first box body 11 and the second box body 12 together define an assembly space for housing the battery cell 20. The second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure, with the first box body 11 overlapping the open side of the second box body 12, thereby defining an assembly space for the first box body 11 and the second box body 12 together. In other embodiments, both the first box body 11 and the second box body 12 may be hollow structures with one end open, and the open side of the first box body 11 overlaps the open side of the second box body 12. Of course, the housing 10 formed by the first box body 11 and the second box body 12 may have various shapes, such as a cylinder or a rectangular parallelepiped. For example, in Figure 2, the shape of the housing 10 is a rectangular parallelepiped.

[0206] Selectively, in the battery 100, the battery cells 20 housed in the housing 10 may be one or multiple. When there are multiple battery cells 20 housed in the housing 10, the connections between the multiple battery cells 20 may be in series, parallel, or series-parallel, where series-parallel connection means that both series and parallel connections exist among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in series-parallel before the entire module composed of the multiple battery cells 20 is housed in the housing 10. Of course, in some embodiments, the battery 100 may consist of multiple battery cells 20 first connected in series, in parallel, or in series-parallel to form a battery module, and then the multiple battery modules may be connected in series, in parallel, or in series-parallel to form a single unit, which is then housed in the housing 10.

[0207] In some embodiments, the battery 100 may further include other structures, for example, the battery 100 may further include a busbar member, the busbar member being installed inside the housing 10 and connected to a plurality of battery cells 20 to provide electrical connections between the plurality of battery cells 20.

[0208] Here, each battery cell 20 may be a secondary battery or a primary battery, and may be, but is not limited to, a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery. The battery cell 20 may be cylindrical, flattened, rectangular, or have other shapes. Exemplarily, in Figure 2, the battery cell 20 has a rectangular parallelepiped structure.

[0209] Referring to several embodiments of this application, specifically Figures 3, 4, 5, and 6, Figure 3 is a schematic diagram of the structure of a battery cell 20 according to several embodiments of this application, Figure 4 is an exploded view of the structure of a battery cell 20 according to several embodiments of this application, Figure 5 is a local cross-sectional view of a battery cell 20 according to several embodiments of this application, and Figure 6 is a schematic diagram of the structure of a check valve 23 according to several embodiments of this application. This application provides a battery cell 20 comprising a housing 21, an electrode assembly 22, and a check valve 23. The housing 21 has a wall portion 211, the electrode assembly 22 is housed within the housing 21, the check valve 23 is installed in the wall portion 211, and the check valve 23 is used to vent gas from inside the housing 21.

[0210] Here, the housing 21 may also be used to house an electrolyte, such as an electrolyte solution. The housing 21 may take various structural forms, such as a cylinder or a rectangular parallelepiped. Similarly, the material of the housing 21 may vary, such as copper, iron, aluminum, steel, or an aluminum alloy.

[0211] In some embodiments, the housing 21 may include a case 212 and an end cap 213, the case 212 having a housing cavity formed inside, the housing cavity being used to house the electrode assembly 22, and the housing cavity having an opening 2121, that is, the case 212 is a hollow structure with an opening 2121 at one end, and the end cap 213 is fitted over the opening 2121 of the case 212 to form a seal connection and create a sealed space for housing the electrode assembly 22 and the electrolyte.

[0212] It should be explained that the wall portion 211 for mounting the check valve 23 may be the end cap 213 of the housing 21, or it may be one of the walls of the case 212 of the housing 21. For example, in Figure 3, the wall portion 211 is the end cap 213. Of course, the structure of the battery cell 20 is not limited to this, and in other embodiments, the wall portion 211 may be the bottom wall on which the case 212 and the end cap 213 are installed facing each other, or the wall portion 211 may be the side wall on which the case 212 is adjacent to and connected to the end cap 213.

[0213] When assembling the battery cell 20, the electrode assembly 22 may first be placed inside the case 212, the electrolyte may be filled into the case 212, and then the end cap 213 may be placed over the opening 2121 of the case 212 to complete the assembly of the battery cell 20.

[0214] The case 212 may have various shapes, such as a cylindrical, rectangular, or rectangular structure. The shape of the case 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 case 212 can be selected, and if the electrode assembly 22 has a rectangular structure, a rectangular case 212 can be selected. Of course, the structure of the end cap 213 may vary, for example, the end cap 213 may have a plate-like structure or a hollow structure with one end open. Exemplarily, in Figure 3, the case 212 has a rectangular structure.

[0215] Of course, as can be understood, the housing 21 is not limited to the above structure, and the housing 21 may have other structures, for example, the housing 21 may include a case 212 and two end caps 213, the case 212 being a hollow structure with opposing openings 2121 on both sides, one end cap 213 correspondingly fitting over one of the openings 2121 of the case 212 to form a seal connection and create a sealed space for housing the electrode assembly 22 and the electrolyte, that is, the case 212 has openings 2121 on both opposing sides, and the two end caps 213 each fit over the sides of the case 212 to seal the corresponding openings 2121.

[0216] It should be explained that the electrode assembly 22 is a component that undergoes an electrochemical reaction in the battery cell 20, and the structure of the electrode assembly 22 can vary. For example, the electrode assembly 22 may be a wound structure formed by winding a positive electrode plate, a separator member, and a negative electrode plate, or it may be a laminated structure formed by stacking the positive electrode plate, a separator member, and a negative electrode plate.

[0217] For example, the separator member is a separator, and the main material of the separator may be selected from at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride.

[0218] Selectively, the electrode assembly 22 housed within the housing 21 may be one or multiple. Exemplarily, in Figure 3, two electrode assemblies 22 are installed in the housing 21 of the battery cell 20, and the two electrode assemblies 22 are stacked along their thickness direction, that is, the two electrode assemblies 22 are stacked along the thickness direction of the battery cell 20. Of course, in other embodiments, the electrode assembly 22 housed within the housing 21 may be one, three, four, five, six, seven, or eight, and so on.

[0219] It should be explained that the check valve 23 is installed on the wall portion 211 and is used to discharge gas from inside the housing 21, that is, the check valve 23 can be opened in one direction to exhaust gas, thereby allowing gas from inside the housing 21 to be discharged to the outside of the housing 21 via the check valve 23. The structure in which the check valve 23 is selectively installed on the wall portion 211 may vary, and the check valve 23 may be welded to the wall portion 211, the check valve 23 may be locked to the wall portion 211, or the check valve 23 may be bonded to the wall portion 211. Here, the outside of the housing 21 is the external environment of the battery cell 20.

[0220] For example, in Figure 5, a mounting hole 2111 is provided on the wall portion 211, the mounting hole 2111 connects the inside of the housing 21 to the outside of the housing 21, the portion of the check valve 23 is assembled within the mounting hole 2111, extends into the inside of the housing 21 along the thickness direction X of the wall portion, and is sealed between the check valve 23 and the wall surface of the mounting hole 2111.

[0221] In some embodiments, the battery cell 20 may further include electrode terminals 24 which are insulatedly mounted on the housing 21 and electrically connected to an electrode assembly 22 to output or input electrical energy of the battery cell 20.

[0222] It should be explained that the electrode terminal 24 is insulatedly mounted on the housing 21, meaning that no electrical connection is formed between the electrode terminal 24 and the housing 21.

[0223] In Figure 3, the battery cell 20 includes two electrode terminals 24, and correspondingly, each electrode assembly 22 has two tabs 221 with opposite polarity, and the two electrode terminals 24 are electrically connected to the two tabs 221 of the electrode assembly 22, respectively, to realize the positive and negative input or output of the battery cell 20. It should be explained that the tabs 221 of the electrode assembly 22 are members formed by stacking and connecting regions on the positive electrode plate where the positive electrode active material layer is not coated, or members formed by stacking and connecting regions on the negative electrode plate where the negative electrode active material layer is not coated. When the tabs 221 are used to output the positive electrode of the electrode assembly 22, the tabs 221 are members formed by stacking and connecting regions on the positive electrode plate where the positive electrode active material layer is not coated, and when the tabs 221 are used to output the negative electrode of the electrode assembly 22, the tabs 221 are members formed by stacking and connecting regions on the negative electrode plate where the negative electrode active material layer is not coated.

[0224] For example, the material of the electrode terminal 24 may vary; for instance, the electrode terminal 24 may be made of copper, iron, aluminum, steel, or an aluminum alloy.

[0225] The structure in which the electrode terminals 24 are mounted on the housing 21 can vary. For example, in Figure 3, both electrode terminals 24 are mounted on the end caps 213 of the housing 21. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, both electrode terminals 24 may be mounted on the case 212 of the housing 21. Similarly, one electrode terminal 24 may be mounted on the case 212 of the housing 21, and the other electrode terminal 24 may be mounted on the end cap 213 of the housing 21.

[0226] In some embodiments, the battery cell 20 may further include a pressure relief mechanism 25 mounted on the housing 21. Optionally, the pressure relief mechanism 25 may be mounted on the end cap 213 of the housing 21 or on the case 212 of the housing 21, and the pressure relief mechanism 25 is used to release pressure inside the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0227] For example, in Figure 4, the pressure relief mechanism 25 is installed on the end cap 213 of the housing 21, and the pressure relief mechanism 25 may be a pressure relief member such as an explosion-proof valve, explosion-proof plate, pressure relief valve, or safety valve.

[0228] By installing a check valve 23 on the wall portion 211 of the housing 21, the check valve 23 can open in one direction, allowing gas inside the housing 21 to be discharged to the outside of the housing 21. This allows gas to be discharged to the outside of the housing 21 via the check valve 23 when gas is generated inside the housing 21 during normal use of the battery cell 20, thereby mitigating the phenomenon of premature operation and pressure release of the battery cell 20 caused by the rise in internal pressure inside the battery cell 20 causing the internal pressure to reach a threshold prematurely. Furthermore, this effectively improves the operational stability of the battery cell 20, thereby improving its service life and operational reliability.

[0229] Referring to some embodiments of this application, specifically with reference to Figures 5 and 6, and further with Figures 7 and 8, Figure 7 is an exploded view of the structure of a check valve 23 according to some embodiments of this application, and Figure 8 is a cross-sectional view of a check valve 23 according to some embodiments of this application. The check valve 23 may include a valve body 231 and a valve core 232. The valve body 231 is installed in the wall portion 211, and a mounting cavity 2311 is formed inside the valve body 231. An intake port 2312 and an exhaust port 2313 are installed on the valve body 231, the intake port 2312 is used to communicate between the mounting cavity 2311 and the inside of the housing 21, and the exhaust port 2313 is used to communicate between the mounting cavity 2311 and the outside of the housing 21. The valve core 232 is installed in the mounting cavity 2311 and is used to seal the intake port 2312 and to open the intake port 2312 under the action of the gas inside the housing 21.

[0230] Here, the intake port 2312 is used to communicate the mounting cavity 2311 with the inside of the housing 21, that is, gas inside the housing 21 can enter the mounting cavity 2311 through the intake port 2312. Similarly, the exhaust port 2313 is used to communicate the mounting cavity 2311 with the outside of the housing 21, that is, gas that enters the mounting cavity 2311 from the inside of the housing 21 can be discharged to the outside of the housing 21 through the exhaust port 2313.

[0231] The valve core 232 is used to seal the intake port 2312 and to open the intake port 2312 under the action of the gas inside the housing 21. In other words, when the valve core 232 can seal the intake port 2312, gas from outside the housing 21 cannot enter the housing 21, and gas from inside the housing 21 cannot be discharged to the outside of the housing 21. When the pressure of the gas inside the housing 21 reaches a certain threshold, the gas inside the housing 21 can push the valve core 232 to open the intake port 2312, thereby allowing the gas inside the housing 21 to enter the mounting cavity 2311 and then be discharged to the outside of the housing 21 via the exhaust port 2313.

[0232] Selectively, the structure of the valve core 232 may vary. For example, in Figures 5 and 7, the valve core 232 may include an elastic member 2321 and a sealing member 2322. Both the elastic member 2321 and the sealing member 2322 are installed within the mounting cavity 2311. The elastic member 2321 provides an elastic force to the sealing member 2322, so that the sealing member 2322 can seal the intake port 2312. If the force exerted by the gas inside the housing 21 on the sealing member 2322 is greater than the elastic force of the elastic member 2321, the gas inside the housing 21... The elastic force of the elastic member 2321 can overcome the elastic force of the sealing member 2322, which pushes the intake port 2312 open, allowing the gas inside the housing 21 to enter the mounting cavity 2311 and then be discharged to the outside of the housing 21 through the exhaust port 2313. Conversely, after the gas inside the housing 21 has been discharged, and the force acting on the sealing member 2322 by the gas inside the housing 21 is less than the elastic force of the elastic member 2321, the elastic member 2321 can return the sealing member 2322 to its original position and seal the intake port 2312. Of course, in other embodiments, the valve core 232 may be made of an elastic material as a whole, such as elastic rubber.

[0233] The check valve 23 is equipped with a valve body 231 and a valve core 232. The valve body 231 is mounted on the wall portion 211, and on the valve body 231 there is an intake port 2312 that communicates with the mounting cavity 2311 and the inside of the housing 21, and an exhaust port 2313 that communicates with the mounting cavity 2311 and the outside of the housing 21. The valve core 232 is mounted inside the mounting cavity 2311, so that the valve core 232 can seal the intake port 2312, and when the pressure inside the housing 21 rises, the gas inside the housing 21 acts on the valve core 232, causing the valve core 232 to open the intake port 2312, thereby enabling the check valve 23 to perform a one-way exhaust function, and so that the check valve 23 can discharge the gas inside the housing 21 to the outside of the housing 21.

[0234] According to some embodiments of this application, with reference to 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 mounted on the wall 211, and an intake port 2312 is mounted on the valve body 2314. Along the thickness direction X of the wall, the valve cover 2315 is mounted on the end of the valve body 2314 away from the electrode assembly 22, and the valve cover 2315 and the valve body 2314 together form a mounting cavity 2311.

[0235] Here, the valve body 2314 is installed in the wall 211 and extends into the housing 21 along the thickness direction X of the wall, that is, the valve body 2314 protrudes from the surface of the wall 211 facing the electrode assembly 22 along the thickness direction X of the wall. The valve body 2314 is sealed in the mounting hole 2111 and may be welded to the wall 211 or bonded to the wall 211 with a sealant.

[0236] An intake port 2312 is provided on the valve body 2314. Exemplarily, the intake port 2312 is located at the end of the wall of the valve body 2314 facing the electrode assembly 22 in the thickness direction X. Of course, in other embodiments, the intake port 2312 may be located on the outer circumferential surface of the portion of the valve body 2314 that extends into the housing 21.

[0237] Selectively, the valve cover 2315 may be positioned at the end of the valve body 2314 away from the electrode assembly 22, or connected to the end of the valve body 2314 away from the electrode assembly 22, or connected to the wall 211, and the valve cover 2315 and the valve body 2314 may be arranged along the thickness direction X of the wall. Exemplarily, in Figures 5 and 8, the valve cover 2315 is connected to the end of the valve body 2314 away from the electrode assembly 22, thereby forming the interiors of the valve cover 2315 and the valve body 2314 together enclosing a mounting cavity 2311 for housing the valve core 232.

[0238] It should be explained that in embodiments where the valve cover 2315 is connected to the end of the valve body 2314 away from the electrode assembly 22, the exhaust port 2313 may be opened directly on the valve cover 2315, i.e., the exhaust port 2313 is a passage installed on the valve cover 2315, or it may be installed between the valve cover 2315 and the valve body 2314, i.e., the exhaust port 2313 is a gap formed between the valve cover 2315 and the valve body 2314.

[0239] For example, the material of the valve body 2314 may be a metal, such as copper, iron, aluminum, steel, or an aluminum alloy. Similarly, the material of the valve cover 2315 may be a metal, such as copper, iron, aluminum, steel, or an aluminum alloy. Here, the valve body 2314 and the valve cover 2315 may be made of the same material or different materials.

[0240] The valve body 231 of the check valve 23 is fitted with a valve body 2314 and a valve cover 2315. By connecting the valve cover 2315 to the end of the valve body 2314 that is away from the electrode assembly 22 in the thickness direction X of the wall, the valve cover 2315 and the valve body 2314 together define a mounting cavity 2311 for housing the valve core 232. A check valve 23 employing such a structure makes it easier to assemble the valve core 232 into the mounting cavity 2311 by fitting the valve body 231 into two parts, which is advantageous in reducing the difficulty of assembling the check valve 23.

[0241] In some embodiments, referring to Figures 6, 7, and 8, the valve cover 2315 is connected to the valve body 2314, and the exhaust port 2313 is a first through-hole located on the valve cover 2315.

[0242] Here, the exhaust port 2313 penetrates both sides of the valve cover 2315 along the thickness direction X of the wall, thereby connecting the exhaust port 2313 to the mounting cavity 2311.

[0243] The exhaust ports 2313 selectively installed on the valve cover 2315 may be one or more. For example, in Figure 6, three exhaust ports 2313 are installed on the valve cover 2315, and of course, in other embodiments, the number of exhaust ports 2313 installed on the valve cover 2315 may be two, four, five, or six, etc.

[0244] For example, there are multiple exhaust ports 2313 installed on the valve cover 2315, and these multiple exhaust ports 2313 are arranged at equal intervals.

[0245] For example, multiple exhaust ports 2313 are arranged at equal intervals around the center of the valve cover 2315, thus allowing for smoother gas flow.

[0246] By providing a first through-hole on the valve cover 2315 of the valve body 231 to form an exhaust port 2313 of the valve body 231, the mounting cavity 2311 of the valve body 231 can communicate with the outside of the housing 21 through the first through-hole provided on the valve cover 2315. A valve body 231 employing such a structure can reduce the interference effect of the exhaust port 2313 on the connection between the valve cover 2315 and the valve body 2314, which is advantageous in reducing the difficulty of assembling the valve cover 2315 and the valve body 2314.

[0247] Of course, in embodiments where the valve cover 2315 is connected to the end of the valve body 2314 away from the electrode assembly 22, the structure of the exhaust port 2313 is not limited to this, and in some embodiments, refer to Figure 9, which is a schematic diagram of the structure of a check valve 23 according to some other embodiments of this application. The valve cover 2315 is connected to the valve body 2314, and the exhaust port 2313 is a first exhaust gap formed between the valve cover 2315 and the valve body 2314.

[0248] Here, a plurality of protrusions 2315a are provided on the outer circumferential surface of the valve cover 2315, and the plurality of protrusions 2315a are arranged at intervals along the circumferential direction of the valve cover 2315. The protrusions 2315a are fitted tightly onto the valve body 2314, and a first exhaust gap is formed between the area on the outer circumferential surface of the valve cover 2315 where no protrusions 2315a are installed and the valve body 2314. That is, in the circumferential direction of the valve cover 2315, the exhaust port 2313 is formed between two adjacent protrusions 2315a.

[0249] By providing a first exhaust gap between the valve cover 2315 and the valve body 2314, and forming an exhaust port 2313 for the valve element 231, the mounting cavity 2311 of the valve element 231 can communicate with the outside of the first exhaust gap housing 21 formed between it and the valve body 2314 via the valve cover 2315, resulting in a simple structure that is also easy to manufacture.

[0250] According to some embodiments of this application, referring to Figures 6, 7 and 8, the valve cover 2315 is connected to the valve body 2314, and a recessed groove 2314a is provided at the end of the valve body 2314 away from the electrode assembly 22, and at least a portion of the valve cover 2315 is housed within the recessed groove 2314a.

[0251] Here, the mounting cavity 2311 penetrates the bottom surface of the recessed groove 2314a, and the valve cover 2315 is assembled within the recessed groove 2314a and abuts against the bottom surface of the recessed groove 2314a, thereby forming the valve cover 2315 and valve body 2314 surrounding the mounting cavity 2311.

[0252] At least a portion of the valve cover 2315 is housed within the recessed groove 2314a, meaning the valve cover 2315 may be located entirely within the recessed groove 2314a, or partially within the recessed groove 2314a, that is, in the thickness direction X of the wall portion, the valve cover 2315 may or may not extend from the recessed groove 2314a.

[0253] A recessed groove 2314a is provided on the end of the valve body 2314 that is separated from the electrode assembly 22, and at least a portion of the valve cover 2315 is housed within the recessed groove 2314a. Thus, a check valve 23 employing such a structure can save space occupied in the thickness direction X of the wall portion of the valve body 231, while improving the structural stability of the valve cover 2315 as assembled on the valve body 2314 and providing a certain level of protection to the valve cover 2315, thereby reducing the phenomenon of wear or damage to the valve cover 2315.

[0254] In some embodiments, referring to Figure 8, the valve cover 2315 does not protrude beyond the end away from the electrode assembly 22 of the valve body 2314 along the thickness direction X of the wall. That is, the entire valve cover 2315 is located within the recessed groove 2314a.

[0255] For example, in the thickness direction X of the wall, the surface of the valve cover 2315 away from the electrode assembly 22 and the end face of the end of the valve body 2314 away from the electrode assembly 22 are flush with each other.

[0256] By positioning the valve cover 2315 so that it does not protrude beyond the end of the valve body 2314 that is separated from the electrode assembly 22 in the thickness direction X of the wall, the entire valve cover 2315 is positioned within the recessed groove 2314a, which further saves the space occupied in the thickness direction X of the wall of the valve body 231 and further improves the protective role of the valve cover 2315, thereby reducing the phenomenon of wear or damage to the valve cover 2315.

[0257] In some embodiments, referring to Figure 5, along the thickness direction X of the wall, the wall portion 211 has a first surface 2112 that moves away from the electrode assembly 22, and the valve body 2314 does not protrude beyond the first surface 2112.

[0258] Here, the valve body 2314 does not protrude beyond the first surface 2112, that is, the valve body 2314 of the valve element 231 does not protrude from the side away from the electrode assembly 22 of the wall 211 in the thickness direction X of the wall, and in embodiments in which the valve cover 2315 is connected to the valve body 2314 and is located entirely within the recessed groove 2314a, the check valve 23 does not protrude from the side away from the electrode assembly 22 of the wall 211 in the thickness direction X of the wall.

[0259] By positioning the valve body 2314 of the valve element 231 so that it does not protrude beyond the first surface 2112 that is separated from the electrode assembly 22 of the wall 211 in the thickness direction X of the wall, the valve element 231 does not protrude from the first surface 2112 in the thickness direction X of the wall, saving the space occupied in the thickness direction X of the wall of the battery cell 20. At the same time, it reduces the phenomenon of the valve element 231 wearing down or colliding with the external environment, which is advantageous in improving the protective role of the valve element 231 and can improve the service life of the check valve 23.

[0260] Of course, the assembly structure of the check valve 23 and the wall portion 211 is not limited to this, and in some embodiments, the battery cell 20 may have other structures. For example, referring to Figure 10, which is a local cross-sectional view of a battery cell 20 according to yet another embodiment of the present application, in which the valve cover 2315 is connected to the wall portion 211, and the exhaust port 2313 is a second exhaust gap formed between the valve cover 2315 and the wall portion 211.

[0261] Here, the valve cover 2315 is located at the end of the valve body 2314 that is away from the electrode assembly 22 in the thickness direction X of the wall, and the valve cover 2315 is connected to the wall 211 so that the valve cover 2315 and the valve body 2314 together define a mounting cavity 2311 for housing the valve core 232.

[0262] Exemplary, in Figure 10, the wall portion 211 has a first surface 2112 that is away from the electrode assembly 22, and a mounting groove 2113 is provided on the first surface 2112. The valve cover 2315 is housed in the mounting groove 2113, and the surface of the wall portion of the valve cover 2315 that is away from the electrode assembly 22 in the thickness direction X 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.

[0263] The structure by which the valve cover 2315 is selectively connected to the wall portion 211 may vary. For example, the valve cover 2315 may be welded to the groove side of the mounting groove 2113, or the valve cover 2315 may be press-fitted to the groove side of the mounting groove 2113. Similarly, the exhaust port 2313 is a second exhaust gap formed between the valve cover 2315 and the wall portion 211. The structure of the second exhaust gap may vary. For example, it may be a first recessed groove installed on the outer circumferential surface of the valve cover 2315, forming a second exhaust gap between the groove bottom of the first recessed groove and the groove side of the mounting groove 2113.

[0264] By connecting the valve cover 2315 onto the wall portion 211 and making the exhaust port 2313 of the valve body 231 a second exhaust gap installed between the valve cover 2315 and the wall portion 211, a battery cell 20 employing such a structure can enlarge the size of the mounting cavity 2311 formed between the valve cover 2315 and the valve body 2314, thereby improving the exhaust efficiency and smoothness of the check valve 23. At the same time, the exhaust port 2313 of the check valve 23 can be directly formed between the valve cover 2315 and the wall portion 211, which is advantageous in reducing the phenomenon of the exhaust port 2313 being obstructed by other components of the battery cell 20.

[0265] According to some embodiments of this application, referring to Figure 5, the valve body 2314 and wall portion 211 of the valve body 231 are in a structure where they are installed separately. A mounting hole 2111 is provided on the wall portion 211 that connects the inside of the housing 21 to the outside of the housing 21, and the valve body 2314 of the valve body 231 is inserted into the mounting hole 2111 and sealed to the wall surface of the mounting hole 2111. Of course, in some embodiments, the battery cell 20 may have other structures, for example, the valve body 2314 is integrally molded with the wall portion 211. That is, the valve body 2314 and wall portion 211 of the valve body 231 are in an integral structure and may be manufactured by an integral molding process, for example, pressing or casting. Installing the valve body 2314 of the valve body 231 in a structure integrally molded with the wall portion 211 is advantageous in improving the structural stability and structural strength of the valve body 2314 installed on the wall portion 211.

[0266] According to some embodiments of this application, with reference to Figures 5, 7, and 8, the valve core 232 may include an elastic member 2321 and a sealing member 2322. The elastic member 2321 is installed in a mounting cavity 2311, and the sealing member 2322 is movably installed in the mounting cavity 2311. The sealing member 2322 is used to seal the intake port 2312 under the action of the elastic member 2321 and to open the intake port 2312 under the action of the gas inside the housing 21.

[0267] Here, the sealing member 2322 is movably installed within the mounting cavity 2311, that is, the sealing member 2322 can move within the mounting cavity 2311, thereby sealing the air intake 2312 when it moves closer to the air intake 2312, and conversely, opening the air intake 2312 when the sealing member 2322 moves away from the air intake 2312.

[0268] Exemplarily, the intake port 2312 is installed at the end close to the electrode assembly 22 in the thickness direction X of the wall portion of the valve body 2314. That is, the intake port 2312 penetrates the cavity bottom surface of the mounting cavity 2311. Correspondingly, the sealing member 2322 is installed movably in the mounting cavity 2311 along the thickness direction X of the wall portion. Thereby, when the sealing member 2322 abuts against the cavity bottom surface of the mounting cavity 2311, the intake port 2312 can be sealed. Of course, in other embodiments, the intake port 2312 may be installed on one side of the valve body 2314 in the radial direction of the valve body 2314. Correspondingly, the sealing member 2322 is installed movably in the mounting cavity 2311 along the radial direction of the valve body 2314.

[0269] The sealing member 2322 is used to seal the intake port 2312 under the action of the elastic member 2321 and is also used to open the intake port 2312 under the action of the gas inside the housing 21. That is, the elastic member 2321 can provide an elastic force to the sealing member 2322. Thereby, the sealing member 2322 can abut against the cavity bottom surface of the mounting cavity 2311 to seal the intake port 2312. Conversely, when the acting force of the gas inside the housing 21 acting on the sealing member 2322 is greater than the elastic force of the elastic member 2321, the gas inside the housing 21 can overcome the elastic force of the elastic member 2321 and push the sealing member 2322 to separate from the cavity bottom surface of the mounting cavity 2311, so as to realize that the sealing member 2322 opens the intake port 2312. Thereby, the gas inside the housing 21 can enter the mounting cavity 2311 through the intake port 2312 and then be discharged through the exhaust port 2313.

[0270] Optionally, the elastic member 2321 is a member having elasticity, and its structure can be various, for example, an elastic body sheet, a spring or an elastic rubber, etc.

[0271] An elastic member 2321 and a sealing member 2322 are installed on the valve core 232 of the check valve 23, and both the elastic member 2321 and the sealing member 2322 are installed in the mounting cavity 2311. Thus, the elastic member 2321 can apply an elastic force to the sealing member 2322, whereby the sealing member 2322 can seal the air inlet 2312 to prevent gas outside the housing 21 from entering the inside of the housing 21. When the pressure inside the housing 21 rises, the gas inside the housing 21 can act on the sealing member 2322 and overcome the elastic force of the elastic member 2321. As a result, the sealing member 2322 can open the air inlet 2312, and the gas inside the housing 21 can be discharged through the check valve 23, realizing that the check valve 23 can discharge the gas inside the housing 21 to the outside of the housing 21, and preventing the gas outside the housing 21 from entering the inside of the housing 21.

[0272] In some embodiments, referring to FIGS. 7 and 8, the elastic member 2321 is a spring. Of course, in other embodiments, the elastic member 2321 may be an elastic sheet or an elastic rubber, etc.

[0273] It should be noted that the projection in the thickness direction X of the wall of the exhaust port 2313 may be located inside the spring or outside the spring. When there are multiple exhaust ports 2313, the projections in the thickness direction X of the walls of the multiple exhaust ports 2313 may all be located inside the spring or surrounded outside the spring. Of course, in some embodiments, they may be partially located inside the spring and partially located outside the spring.

[0274] Here, the spring is positioned along the thickness direction X of the wall, and both ends of the spring abut against the sealing member 2322 and the valve cover 2315, respectively. Furthermore, when the spring is compressed, it is positioned between the valve cover 2315 and the sealing member 2322. As a result, the spring can impart elastic force to the sealing member 2322, thereby causing the sealing member 2322 to abut against the bottom surface of the mounting cavity 2311 and seal the intake port 2312.

[0275] By selectively setting the compression allowance of the elastic member 2321, which is positioned between the valve cover 2315 and the sealing member 2322 in a compressed state, to 0.5 mm or more, the elastic member 2321 has sufficient compression allowance for the sealing member 2322 to move along the thickness direction X of the wall, thereby enabling the sealing member 2322 to open the intake port 2312. If the elastic member 2321 is a spring, the sum of the gaps between each ring of the spring in the thickness direction X of the wall is 0.5 mm or more.

[0276] By using a spring as the elastic member 2321 installed in the mounting cavity 2311, the assembly of the elastic member 2321 becomes easier, which is advantageous in reducing the difficulty of assembling the elastic member 2321 in the mounting cavity 2311, while also ensuring that the direction in which the elastic member 2321 applies elastic force to the sealing member 2322 is relatively stable.

[0277] In some embodiments, the material of the elastic member 2321 includes steel, iron, or aluminum. Elastic members 2321 made of steel, iron, or aluminum have relatively good toughness and can mitigate the phenomenon of elastic failure of the elastic member 2321, which is advantageous in improving the service life of the elastic member 2321.

[0278] According to some embodiments of this application, referring to Figures 5, 7, and 8, the valve cover 2315 and the sealing member 2322 are spaced apart along the thickness direction X of the wall, both ends of the elastic member 2321 abut against the valve cover 2315 and the sealing member 2322, respectively, and the intake port 2312 is installed on the bottom surface of the mounting cavity 2311.

[0279] Here, along the thickness direction X of the wall, the valve cover 2315 and the cavity bottom surface of the mounting cavity 2311 are installed facing each other, and the elastic member 2321 is installed between the valve cover 2315 and the sealing member 2322, so that the sealing member 2322 can abut against the cavity bottom surface of the mounting cavity 2311 under the action of the elastic member 2321, thereby sealing the intake port 2312. Of course, if the intake port 2312 is installed on the cavity wall surface of the mounting cavity 2311, that is, if the intake port 2312 is installed on one side in the radial direction of the valve body 2314, the sealing member 2322 and the elastic member 2321 are arranged along the radial direction of the valve body 2314, and both ends of the elastic member 2321 abut against the sealing member 2322 and the cavity wall surface of the mounting cavity 2311, respectively.

[0280] Selectively, the structure of the sealing member 2322 may vary. In Figures 7 and 8, the sealing member 2322 includes a pressing portion 2322a and a sealing portion 2322b, the rigidity of the pressing portion 2322a being greater than that of the sealing portion 2322b, the sealing portion 2322b being connected to the side of the pressing portion 2322a away from the valve cover 2315 along the thickness direction X of the wall, the sealing portion 2322b being used to seal the intake port 2312, the elastic member 2321 being installed between the valve cover 2315 and the pressing portion 2322a, the pressing portion 2322a being pressed against the sealing portion 2322b by the elastic force of the elastic member 2321, the sealing portion 2322b contacting the cavity wall surface of the mounting cavity 2311, thereby sealing the intake port 2312 via the sealing portion 2322b. Of course, in other embodiments, the sealing member 2322 may be a sealing member as a whole, for example, a rubber packing or a silica packing, that is, the sealing member 2322 includes only the sealing portion 2322b, and both ends of the elastic member 2321 abut against the valve cover 2315 and the sealing portion 2322b, respectively.

[0281] By arranging the valve cover 2315 and the sealing member 2322 in a structure with a gap between them along the thickness direction X of the wall, both ends of the elastic member 2321 abut against the valve cover 2315 and the sealing member 2322, respectively, so that the sealing member 2322 can seal the intake port 2312 installed on the bottom surface of the mounting cavity 2311 along the thickness direction X of the wall under the action of the elastic member 2321, that is, the intake port 2312 of the valve body 2314 The sealing member 2322 is installed at the end of the wall facing the electrode assembly 22 in the thickness direction X of the wall, and under the action of the elastic member 2321, it moves along the thickness direction X of the wall and can seal the intake port 2312. A check valve 23 employing such a structure makes it easy for the elastic member 2321 to apply elastic force to the sealing member 2322, thereby allowing the sealing member 2322 to seal the intake port 2312 and reducing the difficulty of assembling the elastic member 2321.

[0282] According to some embodiments of this application, referring to Figures 7 and 8, a first guide post 2315b is provided on the side of the valve cover 2315 facing the sealing member 2322, and a portion of the elastic member 2321 is fitted onto the outside of the first guide post 2315b.

[0283] Here, the elastic member 2321 is a spring, the portion of which is fitted onto the outside of the first guide post 2315b, and the end of the spring away from the sealing member 2322 abuts against the surface of the valve cover 2315 on which the first guide post 2315b is protruding, that is, the first guide post 2315b is inserted into the spring.

[0284] For example, the central axis of the first guide post 2315b coincides with the central axis of the mounting hole 2111, and the central axis of the elastic member 2321 coincides with the central axis of the first guide post 2315b.

[0285] In a check valve 23 employing such a structure, the first guide post 2315b is provided on the side of the valve cover 2315 facing the sealing member 2322, and the portion of the elastic member 2321 is fitted onto the outside of the first guide post 2315b. This allows the first guide post 2315b to provide a certain positioning role to the elastic member 2321, facilitating the assembly of the elastic member 2321 and reducing the difficulty of assembling the elastic member 2321. Furthermore, the first guide post 2315b acts as a guide when the elastic member 2321 is compressed along the thickness direction X of the wall, reducing the phenomenon of radial deformation of the elastic member 2321 during the compression process. This ensures that the elastic member 2321 is compressed stably along the thickness direction X of the wall, improving the reliability of the elastic member 2321 and further reducing the risk of the sealing member 2322 accidentally opening the air intake port 2312.

[0286] In an embodiment in which a first guide post 2315b is provided protruding from the valve cover 2315 and the exhaust port 2313 is a first through-hole installed on the valve cover 2315, the structure of the valve cover 2315 can vary. For example, referring to Figures 6, 7, and 8, the valve cover 2315 is connected to the valve body 2314, the exhaust port 2313 is a first through-hole installed on the valve cover 2315, and the exhaust port 2313 and the first guide post 2315b are spaced apart along the radial direction of the first guide post 2315b.

[0287] Here, the exhaust port 2313 and the first guide post 2315b are spaced apart, that is, the exhaust port 2313 is located outside the first guide post 2315b. Exemplarily, in Figures 7 and 8, three exhaust ports 2313 are installed, spaced apart along the circumferential direction of the first guide post 2315b, the three exhaust ports 2313 are installed surrounding the outside of the first guide post 2315b, and the three exhaust ports 2313 are installed around the central axis of the mounting hole 2111. Of course, in other embodiments, there may be two, four, or five exhaust ports 2313, etc.

[0288] In some embodiments, the valve cover 2315 may have other structures. For example, referring to FIGS. 11 and 12, FIG. 11 is a schematic structural view of the check valve 23 according to some further embodiments of the present application, and FIG. 12 is a cross-sectional view of the check valve 23 according to some further embodiments of the present application. Along the thickness direction X of the wall portion, the exhaust port 2313 penetrates through the first guide post 2315b, that is, the exhaust port 2313 is installed at a position having the first guide post 2315b of the valve cover 2315. That is, the exhaust port 2313 extends into the first guide post 2315b along the thickness direction X of the wall portion and penetrates through the first guide post 2315b.

[0289] Exemplarily, in FIGS. 11 and 12, one exhaust port 2313 is installed on the valve cover 2315, and the central axis of the exhaust port 2313 overlaps with the central axis of the first guide post 2315b.

[0290] Installing the exhaust port 2313 in the first through hole opened on the valve cover 2315, and the first through hole penetrating through the first guide post 2315b along the thickness direction X of the wall portion is advantageous for reducing the influence of the interference that the exhaust port 2313 gives to the connection between the valve cover 2315 and the valve body 2314. Similarly, installing the exhaust port 2313 in the first through hole opened on the valve cover 2315 and the exhaust port 2313 being located outside the first guide post 2315b is advantageous for exhaust and reduces the phenomenon that the exhaust port 2313 is sealed by the sealing member 2322.

[0291] According to some embodiments of the present application, referring to FIG. 8, the diameter of the first guide post 2315b is D1, the inner diameter of the elastic member 2321 is D2, and 0 mm < D2 - D1 ≤ 5 mm is satisfied.

[0292] Here, the elastic member 2321 is a spring, and the inner diameter D2 of the elastic member 2321 is the diameter of the empty cavity formed inside the spring.

[0293] 0 mm < D2 - D1 ≤ 5 mm, that is, when the first guide post 2315b and the elastic member 2321 are coaxially installed, the size of the gap between the first guide post 2315b and the elastic member 2321 is greater than 0 mm and not more than 5 mm.

[0294] Exemplarily, the difference value between the inner diameter of the elastic member 2321 and the diameter of the first guide post 2315b may be 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm, etc.

[0295] By setting the difference value between the inner diameter of the elastic member 2321 and the diameter of the first guide post 2315b to be greater than 0 mm and not more than 5 mm, the difference value between the inner diameter of the elastic member 2321 and the diameter of the first guide post 2315b is 0 or less, thereby alleviating the phenomenon that it is difficult to assemble the elastic member 2321 onto the first guide post 2315b, and reducing the rubbing phenomenon during the process of externally fitting the elastic member 2321 onto the first guide post 2315b. On the other hand, by reducing the phenomenon that the gap between the elastic member 2321 and the first guide post 2315b is too large due to the difference value between the inner diameter of the elastic member 2321 and the diameter of the first guide post 2315b being too large, the situation where the elastic member 2321 rattles in the radial direction or deforms in the radial direction can be reduced, thereby improving the balance of the elastic force exerted by the elastic member 2321 on the sealing member 2322, and reducing the risk that the sealing member 2322 accidentally opens the air inlet 2312.

[0296] According to some embodiments of the present application, referring to FIG. 13, FIG. 13 is a cross-sectional view of the check valve 23 according to some other embodiments of the present application. On the side of the valve cover 2315 facing the sealing member 2322, a first stopper groove 2315c is provided, and the end of the elastic member 2321 away from the sealing member 2322 is inserted into the first stopper groove 2315c.

[0297] In this embodiment, a first stopper groove 2315c is provided on the side of the valve cover 2315 facing the sealing member 2322, that is, the first stopper 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 portion, and in the embodiment in which a first guide post 2315b is provided on the side of the valve cover 2315 facing the sealing member 2322, the first stopper groove 2315c is provided on the surface of the valve cover 2315 on which the first guide post 2315b is provided.

[0298] The end of the elastic member 2321 that is away from the sealing member 2322 is inserted into the first stopper groove 2315c, that is, the end of the elastic member 2321 that is away from the sealing member 2322 abuts against the bottom surface of the first stopper groove 2315c.

[0299] Exemplary, in an embodiment where the elastic member 2321 is a spring, and correspondingly the first stopper groove 2315c is an annular groove structure, and the first guide post 2315b is convex on the side of the valve cover 2315 facing the sealing member 2322, the first stopper groove 2315c is installed surrounding the outside of the first guide post 2315b.

[0300] A first stopper groove 2315c is further provided on the side of the valve cover 2315 facing the sealing member 2322 into which the elastic member 2321 is inserted. This groove acts as a stopper at the end of the elastic member 2321 that presses against the valve cover 2315, reducing the phenomenon of relative radial sliding between the elastic member 2321 and the valve cover 2315. Furthermore, it improves the balance of the elastic force acting on the sealing member 2322 by the elastic member 2321, which is advantageous for improving the reliability of the elastic member 2321.

[0301] According to some embodiments of this application, the end of the elastic member 2321 that is away from the sealing member 2322 is fixedly connected to the valve cover 2315.

[0302] Here, the structure by which the elastic member 2321 is fixedly connected to the valve cover 2315 can vary, for example, by welding or bonding.

[0303] It should be explained that in an embodiment in which a first stopper groove 2315c is installed on the side of the valve cover 2315 facing the sealing member 2322, and the end of the elastic member 2321 away from the sealing member 2322 is inserted into the first stopper groove 2315c, the end of the elastic member 2321 away from the sealing member 2322 is fixedly connected to the bottom surface of the first stopper groove 2315c. In an embodiment in which the first stopper groove 2315c is not installed on the side of the valve cover 2315 facing the sealing member 2322, the end of the elastic member 2321 away from the sealing member 2322 is fixedly connected to the surfaces of the valve covers 2315 that abut against each other.

[0304] By permanently connecting the end of the elastic member 2321 away from the sealing member 2322 to the valve cover 2315, the end of the elastic member 2321 that presses against the valve cover 2315 and the valve cover 2315 are permanently connected to each other. This improves the stability of the elastic member 2321 pressing against the valve cover 2315, further reducing the phenomenon of relative slippage between the elastic member 2321 and the valve cover 2315, and further improving the balance of the elastic force acting on the sealing member 2322 by the elastic member 2321.

[0305] According to some embodiments of this application, referring to Figures 5, 7, and 8, a second guide post 2322c is provided on the side of the sealing member 2322 facing the valve cover 2315, and a portion of the elastic member 2321 is fitted onto the outside of the second guide post 2322c.

[0306] Here, the elastic member 2321 is a spring, the portion of which is fitted onto the outside of the second guide post 2322c, and the end of the spring away from the valve cover 2315 abuts against the surface of the sealing member 2322 on which the second guide post 2322c is protruding, i.e., the second guide post 2322c is inserted into the spring.

[0307] For example, the central axis of the second guide post 2322c coincides with the central axis of the mounting hole 2111, and the central axis of the elastic member 2321 coincides with the central axis of the second guide post 2322c.

[0308] Exemplarily, in an embodiment where the sealing member 2322 includes a pressing portion 2322a and a sealing portion 2322b, referring to FIGS. 7 and 8, the second guide post 2322c is protrudingly provided on the surface of the pressing portion 2322a facing the valve cover 2315.

[0309] The second guide post 2322c is protrudingly provided on the side of the sealing member 2322 facing the valve cover 2315, and a portion of the elastic member 2321 is externally fitted outside the second guide post 2322c. Thus, for the check valve 23 adopting such a structure, the second guide post 2322c can play a role in positioning the elastic member 2321, facilitating the assembly of the elastic member 2321, which is beneficial for reducing the difficulty of assembling the elastic member 2321. On the other hand, when the elastic member 2321 is compressed along the wall thickness direction X by the second guide post 2322c, the second guide post 2322c can play a certain guiding role, reducing the phenomenon that the elastic member 2321 is deformed in the radial direction during the compression process, thereby realizing that the elastic member 2321 is stably compressed along the wall thickness direction X of the wall, which is beneficial for improving the reliability of use of the elastic member 2321. Furthermore, the sealing member 2322 can reduce the risk of accidentally opening the air inlet 2312.

[0310] According to some embodiments of the present application, referring to FIG. 8, the diameter of the second guide post 2322c is D3, the inner diameter of the elastic member 2321 is D2, and 0 mm < D3 - D2 ≤ 5 mm is satisfied.

[0311] Here, the elastic member 2321 is a spring, and the inner diameter D2 of the elastic member 2321 is the diameter of the empty cavity formed inside the spring.

[0312] 0 mm < D3 - D2 ≤ 5 mm, that is, when the second guide post 2322c and the elastic member 2321 are coaxially installed, the size of the gap between the second guide post 2322c and the elastic member 2321 is larger than 0 mm and not more than 5 mm.

[0313] For example, the difference between the inner diameter of the elastic member 2321 and the diameter of the second guide post may be 0.1 mm, 0.2 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 4 mm, 4.5 mm, or 5 mm.

[0314] By setting the difference between the inner diameter of the elastic member 2321 and the diameter of the second guide post 2322c to be greater than 0mm and 5mm or less, the difference between the inner diameter of the elastic member 2321 and the diameter of the second guide post 2322c is 0 or less, thereby mitigating the phenomenon that makes it difficult to assemble the elastic member 2321 onto the second guide post 2322c and reducing the phenomenon of friction during the process of fitting the elastic member 2321 onto the second guide post 2322c. On the other hand, if the difference between the inner diameter of the elastic member 2321 and the diameter of the second guide post 2322c is too large, the phenomenon that the gap between the elastic member 2321 and the second guide post 2322c is too large is mitigated, reducing the situation in which the elastic member 2321 rattles or deforms radially, thereby improving the balance of the elastic force that the elastic member 2321 acts on the sealing member 2322 and reducing the risk that the sealing member 2322 may accidentally open the air intake port 2312.

[0315] According to some embodiments of this application, referring to Figure 13, a second stopper 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 stopper groove 2322d.

[0316] In this embodiment, a second stopper groove 2322d is provided on the side of the sealing member 2322 facing the valve cover 2315, that is, the second stopper groove 2322d is provided on the surface of the sealing member 2322 facing the valve cover 2315 in the thickness direction X of the wall portion of the sealing member 2322, and in the embodiment in which a second guide post 2322c is provided on the side of the sealing member 2322 facing the valve cover 2315, the second stopper groove 2322d is provided on the surface of the sealing member 2322 on which the second guide post 2322c is provided.

[0317] The end of the elastic member 2321 that is away from the valve cover 2315 is inserted into the second stopper groove 2322d, that is, the end of the elastic member 2321 that is away from the valve cover 2315 abuts against the bottom surface of the second stopper groove 2322d.

[0318] Exemplary, in an embodiment where the elastic member 2321 is a spring, and correspondingly the second stopper groove 2322d is an annular groove structure, and a second guide post 2322c is provided protruding from the side of the sealing member 2322 facing the valve cover 2315, the second stopper groove 2322d is installed surrounding the outside of the second guide post 2322c.

[0319] For example, in an embodiment in which the sealing member 2322 includes a pressing portion 2322a and a sealing portion 2322b, referring to Figures 7 and 8, the second stopper groove 2322d is installed on the surface of the pressing portion 2322a facing the valve cover 2315.

[0320] By installing a second stopper groove 2322d into which the elastic member 2321 is inserted on the side of the sealing member 2322 facing the valve cover 2315, the end of the elastic member 2321 that presses against the sealing member 2322 acts as a stopper, reducing the phenomenon of relative radial sliding between the elastic member 2321 and the sealing member 2322. Furthermore, the balance of the elastic force acting on the sealing member 2322 by the elastic member 2321 can be improved, which is advantageous in improving the reliability of the elastic member 2321.

[0321] According to some embodiments of this application, the end of the elastic member 2321 that is separated from the valve cover 2315 is fixedly connected to the sealing member 2322.

[0322] Here, the structure by which the elastic member 2321 is fixedly connected to the sealing member 2322 can vary, for example, by welding or bonding.

[0323] It should be explained that in an embodiment in which a second stopper groove 2322d is installed 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 stopper groove 2322d, the end of the elastic member 2321 away from the valve cover 2315 is fixedly connected to the bottom surface of the second stopper groove 2322d. In an embodiment in which the second stopper groove 2322d is not installed on the side of the sealing member 2322 facing the valve cover 2315, the end of the elastic member 2321 away from the valve cover 2315 is fixedly connected to the surface in which the sealing members 2322 abut each other.

[0324] By permanently connecting the end of the elastic member 2321 that is separated from the valve cover 2315 to the sealing member 2322, the end of the elastic member 2321 that presses against the sealing member 2322 and the sealing member 2322 are permanently connected to each other. This improves the stability of the elastic member 2321 pressing against the sealing member 2322, further reducing the phenomenon of relative slippage between the elastic member 2321 and the sealing member 2322, and further improving the balance of the elastic force acting on the sealing member 2322 by the elastic member 2321.

[0325] According to some embodiments of this application, referring to Figures 7 and 8, the sealing member 2322 is installed with a gap between it and the cavity side of the mounting cavity 2311.

[0326] Here, the sealing member 2322 is installed with a gap between it and the side surface of the mounting cavity 2311, meaning there is a gap between the sealing member 2322 and the side surface of the mounting cavity 2311, in other words, the sealing member 2322 does not come into contact with the side surface of the mounting cavity 2311.

[0327] By installing the sealing member 2322 with a gap between it and the side surface of the mounting cavity 2311, friction between the sealing member 2322 and the side surface of the mounting cavity 2311 is reduced when the sealing member 2322 moves along the thickness direction X of the wall to open or seal the intake port 2312. This reduces the phenomenon of the sealing member 2322 getting stuck or not moving smoothly, which is advantageous in improving the reliability of the check valve 23.

[0328] Of course, the structure of the check valve 23 is not limited to this, and in some embodiments, for example, referring to Figures 14 and 15, Figure 14 is a cross-sectional view of the check valve 23 according to yet another embodiment of the present application, and Figure 15 is a schematic diagram of the structure of the sealing member 2322 of the check valve 23 according to yet another embodiment of the present application. A plurality of stopper protrusions 2322e are provided on the outer circumferential surface of the sealing member 2322, and the plurality of stopper protrusions 2322e are arranged at intervals along the circumferential direction of the sealing member 2322, and the stopper protrusions 2322e are guided and fitted with the cavity side surface of the mounting cavity 2311.

[0329] Here, the stopper projection 2322e is guided and fitted with the cavity side of the mounting cavity 2311, that is, the stopper projection 2322e is used to act as a guide and stopper by fitting with the cavity wall surface of the mounting cavity 2311 as the sealing member 2322 moves along the thickness direction X of the wall.

[0330] Exemplary, in Figure 14, the projection 2322e is used to act as a guide and stopper by contacting the cavity wall surface of the mounting cavity 2311 when the sealing member 2322 moves along the thickness direction X of the wall. Of course, in other embodiments, the check valve 23 may have a different structure. For example, a guide groove extending along the thickness direction X of the wall is provided on the side surface of the mounting cavity 2311, and the stopper projection 2322e extends into the guide groove and moves along the thickness direction X in the guide groove when the sealing member 2322 opens the intake port 2312, thereby acting as a guide and stopper. Multiple guide grooves extending along the thickness direction X of the wall may be provided, and each of the multiple guide grooves engages with multiple stopper projections 2322e.

[0331] For example, in an embodiment in which the sealing member 2322 includes a pressing portion 2322a and a sealing portion 2322b, referring to Figures 7 and 8, the stopper projection 2322e is provided protruding from the outer circumferential surface of the pressing portion 2322a.

[0332] Selectively, the shape of the stopper projection 2322e may vary, for example, it may be a semicircular, triangular, trapezoidal, or rectangular structure. Exemplarily, in Figure 15, the shape of the stopper projection 2322e is semicircular.

[0333] Multiple stopper protrusions 2322e are provided on the outer circumferential surface of the sealing member 2322, arranged at intervals. The stopper protrusions 2322e are guided and fitted with the cavity side surface of the mounting cavity 2311. As a result, when the sealing member 2322 moves along the thickness direction X of the wall, the fit between the stopper protrusions 2322e and the cavity side surface of the mounting cavity 2311 acts as a guide and stopper, improving the stability of the sealing member 2322 as it moves along the thickness direction X of the wall.

[0334] According to some embodiments of this application, referring to Figures 7 and 8, the sealing member 2322 may include a pressing portion 2322a and a sealing portion 2322b, and both ends of the elastic member 2321 abut against the valve cover 2315 and the pressing portion 2322a, respectively, along the thickness direction X of the wall, and the sealing portion 2322b is connected to the side of the pressing portion 2322a away from the valve cover 2315, and the sealing portion 2322b is used to seal the intake port 2312.

[0335] Here, both ends of the elastic member 2321 abut against the valve cover 2315 and the pressing portion 2322a, respectively, and the sealing portion 2322b is connected to the side of the pressing portion 2322a that is away from the valve cover 2315. In other words, the elastic member 2321 is installed between the valve cover 2315 and the pressing portion 2322a along the thickness direction X of the wall, so that the elastic member 2321 can provide an elastic force to the pressing portion 2322a, thereby pressing the pressing portion 2322a onto the sealing portion 2322b, and thereby sealing the intake port 2312 via the sealing portion 2322b.

[0336] Selectively, 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, thereby allowing the pressing portion 2322a to press the sealing portion 2322b more effectively against the bottom surface of the mounting cavity 2311, thereby sealing the intake port 2312. Exemplarily, the material of the pressing portion 2322a may vary, for example, steel, iron, or aluminum. Similarly, the material of the sealing portion 2322b may vary, for example, rubber, silicone rubber, or plastic.

[0337] Selectively, the connection structure between the pressing portion 2322a and the sealing portion 2322b may vary, for example, locking, bolting, or bonding.

[0338] The sealing member 2322 is installed to include two parts, a pressing portion 2322a and a sealing portion 2322b, with the pressing portion 2322a positioned on the side of the sealing portion 2322b facing the valve cover 2315, and the sealing portion 2322b being used to seal the intake port 2312. Furthermore, both ends of the elastic member 2321 are in contact with the valve cover 2315 and the pressing portion 2322a, respectively. This allows the elastic member 2321 to act on the sealing portion 2322b with elastic force via the pressing portion 2322a, which is advantageous for improving the balance of the elastic force acted on the sealing portion 2322b by the elastic member 2321, and furthermore, the sealing effect of the intake port 2312 by the sealing portion 2322b can be effectively improved.

[0339] According to some embodiments of this application, continuing to refer to Figures 7 and 8, the pressing portion 2322a has a first contact surface 2322f facing the sealing portion 2322b, and the sealing portion 2322b has a second contact surface 2322g facing the pressing portion 2322a, and a locking groove 2322h is provided on one of the first contact surface 2322f and the second contact surface 2322g, and a locking portion 2322k is provided on the other, and the locking portion 2322k engages with and fits with the locking groove 2322h.

[0340] Here, the first contact surface 2322f of the pressing portion 2322a and the second contact surface 2322g of the sealing portion 2322b are in contact with each other, and both the first contact surface 2322f and the second contact surface 2322g are planes perpendicular to the thickness direction X of the wall portion.

[0341] A locking groove 2322h is provided on one of the first contact surface 2322f and the second contact surface 2322g, and a locking portion 2322k is provided on the other. The locking portion 2322k and the locking groove 2322h engage and fit together. That is, the locking groove 2322h may be provided on the first contact surface 2322f of the pressing portion 2322a, or on the second contact surface 2322g of the sealing portion 2322b. For example, in Figure 8, the locking portion 2322k is provided protruding from the second contact surface 2322g of the sealing portion 2322b, the locking groove 2322h is provided on the first contact surface 2322f of the pressing portion 2322a, and the locking portion 2322k is locked into the locking groove 2322h.

[0342] For example, the locking portion 2322k is a circular columnar structure, and correspondingly, the locking groove 2322h is a circular groove.

[0343] The pressing portion 2322a and the sealing portion 2322b have a first contact surface 2322f and a second contact surface 2322g facing each other. A locking groove 2322h is provided on one of the first contact surface 2322f and the second contact surface 2322g, and a corresponding locking portion 2322k that engages with and fits into the locking groove 2322h is provided on the other. This improves the structural stability of the sealing portion 2322b being installed on the pressing portion 2322a, reduces the phenomenon of the sealing portion 2322b sliding radially relative to the pressing portion 2322a, and is also advantageous in improving the sealing effect of the air intake port 2312 by the sealing portion 2322b, thereby reducing the phenomenon of the air intake port 2312 being accidentally opened.

[0344] In some embodiments, the sealing portion 2322b is bonded to the pressing portion 2322a.

[0345] By adopting the following structure to connect the sealing part 2322b and the pressing part 2322a, the structural stability of the sealing part 2322b connected on the pressing part 2322a is improved, which is beneficial to reducing the risk that the sealing part 2322b and the pressing part 2322a are separated from each other. On the one hand, the reliability of the sealing part 2322b for sealing the air inlet 2312 can be improved. On the other hand, the realization of the assembly connection between the sealing part 2322b and the pressing part 2322a becomes easy, which is beneficial to reducing the assembly difficulty between the sealing part 2322b and the pressing part 2322a.

[0346] In some embodiments, the material of the sealing part 2322b includes ethylene propylene rubber, fluororubber or Teflon.

[0347] The sealing part 2322b made of ethylene propylene rubber, fluororubber or Teflon has relatively good corrosion resistance, and can effectively alleviate the phenomenon that the sealing part 2322b is corroded by the electrolyte, which is beneficial to improving the service life of the sealing part 2322b, and can reduce the phenomenon that the sealing effect of the sealing part 2322b for sealing the air inlet 2312 is poor after the sealing part 2322b is corroded.

[0348] According to some embodiments of the present application, referring to FIG. 8, along the thickness direction X of the wall portion, the size of the gap between the valve cover 2315 and the sealing member 2322 is L, satisfying 0 mm < L ≤ 2 mm.

[0349] Here, the size of the gap between the valve cover 2315 and the sealing member 2322 is L, that is, the pitch of the valve cover 2315 and the sealing member 2322 in the thickness direction X of the wall portion is L.

[0350] Exemplarily, the size L of the gap between the valve cover 2315 and the sealing member 2322 may be 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.

[0351] It should be explained that in the embodiment in which a first guide post 2315b is provided on the valve cover 2315 and a second guide post 2322c is provided on the sealing member 2322, L is the size in the thickness direction X of the wall portion of the gap formed between the first guide post 2315b and the second guide post 2322c, and in the embodiment in which the first guide post 2315b is provided on the valve cover 2315 and the second guide post 2322c is not provided on the sealing member 2322, L L is the size in the thickness direction X of the wall portion of the gap formed between the first guide post 2315b and the surface of the sealing member 2322 facing the valve cover 2315. In embodiments where the first guide post 2315b is not provided on the valve cover 2315 and the second guide post 2322c of the sealing member 2322 is provided on the valve cover 2322, L is the size in the thickness direction X of the wall portion of the gap formed between the second guide post 2322c and the surface of the valve cover 2315 facing the sealing member 2322.

[0352] By setting the size of the gap between the valve cover 2315 and the sealing member 2322 in the thickness direction X of the wall to be greater than 0 mm and less than or equal to 2 mm, the barrier of the sealing member 2322 by the valve cover 2315 is reduced, allowing the sealing member 2322 to have space between the valve cover 2315 and the sealing member 2322 to move along the thickness direction X of the wall. This enables the sealing member 2322 to open the intake port 2312 and be exhausted when the gas inside the housing 21 pushes against the sealing member 2322. At the same time, the phenomenon of the check valve 23 occupying too much space in the thickness direction X of the wall due to an excessively large gap between the valve cover 2315 and the sealing member 2322 can be mitigated, which is advantageous for improving the space utilization rate of the battery cell 20.

[0353] According to some embodiments of this application, referring to Figure 5, the valve body 2314 is welded to the wall portion 211.

[0354] Here, mounting holes 2111 for attaching the valve body 2314 are provided on the wall portion 211, 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 be welded to the surface of the wall portion 211 away from the electrode assembly 22, or to the surface of the wall portion 211 facing the electrode assembly 22.

[0355] By welding the valve body 2314 to the wall portion 211, the structural stability and strength of the connection between the valve body 2314 and 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.

[0356] Referring to some embodiments of this application, specifically with reference to Figures 5, 7, and 8, and further with Figure 16, Figure 16 is a local cross-sectional view of a wall portion 211 of a housing 21 of a battery cell 20 according to some embodiments of this application. A mounting hole 2111 is provided in the wall portion 2111, and at least a portion of a valve body 2314 is housed 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. Both the first connecting surface 2111a and the second connecting surface 2314b are positioned around the central axis of the mounting hole 2111, and the first connecting surface 2111a is welded to the second connecting surface 2314b.

[0357] Here, the mounting hole 2111 installed on the wall portion 211 communicates the inside and outside of the housing 21, and at least a portion of the valve body 2314 is housed within the mounting hole 2111. That is, the valve body 2314 of the check valve 23 may be located entirely within the mounting hole 2111, or only a portion of it may be located within the mounting hole 2111. For example, in Figure 5, a portion of the valve body 2314 is located within the mounting hole 2111, and the valve body 2314 protrudes from the surface of the wall portion 211 facing the electrode assembly 22 along the thickness direction X of the wall portion.

[0358] 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 is welded to the second connecting surface 2314b, meaning that the portion of the valve body 2314 located within the mounting hole 2111 is welded to the mounting hole 2111.

[0359] The first connecting surface 2111a and the second connecting surface 2314b are both positioned around the central axis of the mounting hole 2111. In other words, both the first connecting surface 2111a and the second connecting surface 2314b are annular structures, and the central axes of the first connecting surface 2111a and the second connecting surface 2314b are aligned with the central axis of the mounting hole 2111. As a result, the first connecting surface 2111a is welded to the second connecting surface 2314b, forming a weld mark of an annular structure.

[0360] Mounting holes 2111 for housing the valve body 2314 of the valve element 231 are provided on the wall portion 211, and the valve body 2314 has a second connecting surface 2314b, which is welded to the first connecting surface 2111a of the wall surface of the mounting hole 2111, thereby enabling the check valve 23 to be assembled on the wall portion 211. The structure in which the annularly installed first connecting surface 2111a is welded to the second connecting surface 2314b improves the robustness of the connection between the valve body 2314 and the wall portion 211, while also improving the sealing effect between the valve body 2314 and the wall surface of the mounting hole 2111.

[0361] According to some embodiments of this application, referring to Figures 5, 8 and 16, the first connecting surface 2111a coincides with the second connecting surface 2314b, and both the first connecting surface 2111a and the second connecting surface 2314b are positioned at an acute angle with the central axis of the mounting hole 2111.

[0362] Here, the first connecting surface 2111a coincides with the second connecting surface 2314b; that is, the first connecting surface 2111a has the same shape as the second connecting surface 2314b and is in contact with each other.

[0363] The first connecting surface 2111a and the second connecting surface 2314b are both positioned at an acute angle with the central axis of the mounting hole 2111. That is, both the first connecting surface 2111a and the second connecting surface 2314b are inclined surfaces. In other words, in a cross-section parallel to the thickness direction X of the wall portion of the valve body 2314, the cross-sectional lines formed by the first connecting surface 2111a and the second connecting surface 2314b are on the same straight line and positioned at an acute angle with the thickness direction X of the wall portion.

[0364] For example, in Figures 5 and 8, the end of the wall portion of the second connection surface 2314b that is away from the electrode assembly 22 in the thickness direction X is further away from the central axis of the mounting hole 2111 than the end of the wall portion of the second connection surface 2314b that is closer to the electrode assembly 22 in the thickness direction X. Similarly, in Figures 5 and 16, the end of the wall portion of the first connection surface 2111a that is away from the electrode assembly 22 in the thickness direction X is further away from the central axis of the mounting hole 2111 than the end of the wall portion of the first connection surface 2111a that is closer to the electrode assembly 22 in the thickness direction X.

[0365] The first connecting surface 2111a and the second connecting surface 2314b are set up in a structure that fits together, and both the first connecting surface 2111a and the second connecting surface 2314b are set at an acute angle with the central axis of the mounting hole 2111, so that the first connecting surface 2111a has the same shape as the second connecting surface 2314b and abuts against each other, and both the first connecting surface 2111a and the second connecting surface 2314b have an inclined structure, so that when the valve body 2314 is assembled in the mounting hole 2111, the first connecting surface 2111a and the second connecting surface 2314b abut against each other, and the degree of adhesion between the first connecting surface 2111a and the second connecting surface 2314b can be improved, which is advantageous in reducing the phenomenon of a gap between the first connecting surface 2111a and the second connecting surface 2314b, and furthermore, the welding quality of the first connecting surface 2111a and the second connecting surface 2314b can be effectively improved.

[0366] According to some embodiments of this application, continuing to refer to Figures 5, 8 and 16, the mounting hole 2111 includes a first hole portion 2111b and a second hole portion 2111c, the first hole portion 2111b and the second hole portion 2111c are arranged along the thickness direction X of the wall portion, and the first hole portion 2111b is located on the side of the second hole portion 2111c away from the electrode assembly 22, and the hole diameter of the first hole portion 2111b is larger than the hole diameter of the second hole portion 2111c. The hole wall surface of the first hole portion 2111b is the first connecting surface 2111a, and the valve body 2314 has a connecting portion 2314c located within the first hole portion 2111b, and the outer circumferential surface of the connecting portion 2314c is the second connecting surface 2314b.

[0367] Here, the diameter of the first hole portion 2111b is larger than the diameter of the second hole portion 2111c, meaning that the mounting hole 2111 has a stepped hole structure. The first hole portion 2111b is located on the side of the second hole portion 2111c that is away from the electrode assembly 22, meaning that the mounting hole 2111 has a stepped hole structure in which the diameter of the hole gradually increases from the end closer to the electrode assembly 22 to the end further away from the electrode assembly 22.

[0368] The hole wall surface of the first hole portion 2111b is the first connecting surface 2111a, and the valve body 2314 has a connecting portion 2314c located within the first hole portion 2111b, and the outer circumferential surface of the connecting portion 2314c is the second connecting surface 2314b. In other words, the valve body 2314 of the valve element 231 has an annular connecting portion 2314c that extends along the circumferential direction of the first hole portion 2111b, the connecting portion 2314c is housed within the first hole portion 2111b, and the outer circumferential surface of the connecting portion 2314c is welded to the hole wall surface of the first hole portion 2111b.

[0369] For example, the outer circumferential surfaces of the connection portion 2314c are connected to each other at the end faces of the valve body 2314 away from the electrode assembly 22, that is, the second connection surface 2314b is connected to each other at the end faces of the valve body 2314 away from the electrode assembly 22.

[0370] The mounting hole 2111 has a first hole portion 2111b and a second hole portion 2111c arranged along the thickness direction X of the wall, the first hole portion 2111b is located on the outside away from the electrode assembly 22 of the second hole portion 2111c, and the diameter of the first hole portion 2111b is larger than the diameter of the second hole portion 2111c, thereby forming a stepped hole structure mounting hole 2111, the hole wall surface of the first hole portion 2111b is set on the first connection surface 2111a, and the valve body 2314 has a connection portion 2314c that is housed in the first hole portion 2111b, and the outer circumference of the connection portion 2314c By making the surface the second connecting surface 2314b, it is made easier to assemble the valve body 2314 into the mounting hole 2111 from the outside of the wall portion 211. After the connecting portion 2314c of the valve body 2314 is housed in the first hole portion 2111b, the first connecting surface 2111a can come into contact with the second connecting surface 2314b. This allows the fitting of the stepped hole structure mounting hole 2111 and the connecting portion 2314c to act as a stopper and positioning mechanism for the valve body 2314, which is advantageous in reducing the difficulty of assembling the valve body 2314 into the mounting hole 2111.

[0371] According to some embodiments of this application, referring to Figures 5, 7, and 8, along the thickness direction X of the wall, the end face of the end of the valve body 2314 away from the electrode assembly 22 connects to a second connecting surface 2314b, and a first stress relief groove 2314d is provided on the end face of the end of the valve body 2314 away from the electrode assembly 22.

[0372] For example, the first stress-relieving groove 2314d is located on the surface of the connection portion 2314c of the valve body 2314 that is away from the electrode assembly 22.

[0373] It should be noted that in other embodiments, a second stress relief groove, which is an annular groove structure, can be installed on the first surface 2112 or the second surface 2114 of the wall portion 211, and the second stress relief groove is installed around the mounting hole 2111 to absorb welding stress due to the welded connection between the valve body 2314 and the wall portion 211 via the second stress relief groove. In some embodiments, the first stress relief groove 2314d and the second stress relief groove may be installed simultaneously.

[0374] By installing a first stress release groove 2314d on the end face of the valve body 2314 that is separated from the electrode assembly 22 along the thickness direction X of the wall portion, the welding stress caused by the mutual welding between the first connection surface 2111a and the second connection surface 2314b can be released through the first stress release groove 2314d. This reduces the influence of welding stress on the weld bead connecting the first connection surface 2111a and the second connection surface 2314b, thereby reducing the risk of the weld bead cracking and further reducing the risk of seal failure at the weld bead.

[0375] In some embodiments, continuing to refer to Figures 6, 7, and 8, the first stress relief groove 2314d is positioned around the central axis of the mounting hole 2111. That is, the first stress relief groove 2314d is an annular groove structure, and exemplary, the first stress relief groove 2314d is positioned surrounding the outside of the valve cover 2315.

[0376] By installing the first stress relief groove 2314d in an annular structure that is positioned around the central axis of the mounting hole 2111, the first stress relief groove 2314d is advantageous in improving the absorption effect of welding stress due to mutual welding between the first connection surface 2111a and the second connection surface 2314b of the annular structure, and further reduces the influence of welding stress on other components such as the valve core 232 of the check valve 23.

[0377] According to some embodiments of this application, with reference to Figures 4 and 5, the battery cell 20 may further include an insulating member 26 installed on the side of the wall 211 facing the electrode assembly 22. Along the thickness direction X of the wall, the wall 211 has a second surface 2114 facing the electrode assembly 22, and the check valve 23 protrudes from the second surface 2114. The insulating member 26 includes a body 261 and a housing 262, the body 261 being installed on the side of the wall 211 facing the electrode assembly 22, and the housing 262 being connected to the body 261, with the portion of the check valve 23 extending into the interior of the housing 21 being housed within the housing 262.

[0378] Here, the insulating member 26 is installed on the side of the wall portion 211 facing the electrode assembly 22, and the insulating member 26 serves to separate the wall portion 211 from the electrode assembly 22, thereby insulating and isolating the wall portion 211 from the electrode assembly 22.

[0379] For example, the material of the insulating member 26 may vary, such as rubber, silicone rubber, or plastic.

[0380] The wall portion 211 has a second surface 2114 facing the electrode assembly 22, and the check valve 23 protrudes from the second surface 2114, that is, the check valve 23 is installed in the mounting hole 2111 and the check valve 23 extends from the second surface 2114 along the thickness direction X of the wall portion, and exemplary in Figure 5, the valve body 2314 of the valve body 231 of the check valve 23 protrudes from the second surface 2114.

[0381] The portion of the check valve 23 that extends into the housing 21 is housed in the housing portion 262; that is, the housing portion 262 is formed at the position of the insulating member 26 corresponding to the check valve 23, and the housing portion 262 covers the outside of the portion of the check valve 23 that protrudes from the second surface 2114.

[0382] Selectively, the main body 261 and housing 262 of the insulating member 26 may be an integrated structure or separate structures. If the main body 261 and housing 262 are an integrated structure, they can be integrally molded by processes such as injection molding or milling. If the main body 261 and housing 262 are separate structures, the housing 262 can be connected to the main body 261 by methods such as bonding or locking.

[0383] An insulating member 26 is further installed in the battery cell 20, and the insulating member 26 includes a main body 261 and a housing 262 connected to each other, the main body 261 being installed on the side of the wall 211 facing the electrode assembly 22, the main body 261 being able to insulate and isolate the wall 211 and the electrode assembly 22, and the housing 262 being able to accommodate the portion of the check valve 23 that protrudes from the second surface 2114 of the wall 211, thereby providing retraction and protection to the check valve 23, and insulating and isolating the electrode assembly 22 and the check valve 23, thereby reducing the risk of short circuit between the check valve 23 and the electrode assembly 22.

[0384] Referring to Figure 5, according to some embodiments of this application, the check valve 23 includes a valve body 231, which protrudes from a second surface 2114 along the thickness direction X of the wall, and an intake port 2312 is provided in the portion of the valve body 231 that protrudes from the second surface 2114, and the intake port 2312 is configured to discharge gas from inside the housing 21. The housing portion 262 is provided with a second through-hole 2621 that communicates with the intake port 2312.

[0385] Here, a second through-hole 2621 is installed on the housing portion 262, and the second through-hole 2621 penetrates the housing portion 262, allowing the second through-hole 2621 to communicate with the inside of the housing portion 262 and the inside of the housing 21. As a result, the intake port 2312 of the valve body 231 can communicate with the inside of the housing 21 via the second through-hole 2621.

[0386] By installing a second through-hole 2621 on the housing portion 262, the second through-hole 2621 can communicate with the inside of the housing 21 and the inside of the housing portion 262. As a result, the intake port 2312 of the valve body 231 of the check valve 23 communicates with the inside of the housing 21 via the second through-hole 2621. This allows gas from inside the housing 21 to enter the housing portion 262 through the second through-hole 2621 and then be discharged to the outside of the housing 21 via the check valve 23. This eliminates the need for the gas to enter the housing portion 262 through the gap between the gas body portion 261 and the wall portion 211 and then be discharged via the check valve 23, which is advantageous for improving the smoothness of the check valve 23 in discharging gas from inside the housing 21.

[0387] Referring to some embodiments of this application, specifically with reference to Figure 5 and further to Figure 17, Figure 17 is a local cross-sectional view of an insulating member 26 of a battery cell 20 according to some embodiments of this application. Along the thickness direction X of the wall, an air intake 2312 is located at the end of the valve body 231 facing the electrode assembly 22. The housing 262 includes a first wall 2622 and a second wall 2623, the first wall 2622 being installed around the valve body 231, one end of the first wall 2622 being connected to the main body 261 along the thickness direction X of the wall, the second wall 2623 being connected to the end of the first wall 2622 away from the main body 261, and a second through-hole 2621 being located in the second wall 2623.

[0388] Here, along the thickness direction X of the wall, the intake port 2312 is installed at the end of the valve body 231 facing the electrode assembly 22, that is, the intake port 2312 is installed on the bottom surface of the cavity where the mounting cavity 2311 and the valve cover 2315 are installed facing each other.

[0389] The first wall 2622 is installed surrounding the valve body 231; that is, the first wall 2622 of the housing 262 is an annular structure installed around the valve body 231.

[0390] 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 that is away from the main body 261. In other words, the second wall 2623 is connected to the main body 261 by the first wall 2622, and the second wall 2623 and the first wall 2622 together form a housing portion 262 for housing the valve body 231, and the second wall 2623 is a single wall on which the housing portion 262 and the intake port 2312 are installed facing each other.

[0391] The second through-hole 2621 is located on the second wall 2623, i.e., on the end of the housing 262 that faces the electrode assembly 22. Of course, in other embodiments, the second through-hole 2621 may be located on the first wall 2622, i.e., on one radial side of the housing 262.

[0392] The housing section 262 is provided with a first wall 2622 and a second wall 2623 that are connected to each other, the first wall 2622 is installed around the valve body 231 and the second wall 2623 is located at the end of the wall portion of the valve body 231 facing the electrode assembly 22 in the thickness direction X, thereby the first wall 2622 and the second wall 2623 form a housing section 262 for housing the portion of the valve body 231 that extends into the interior of the housing 21, and the second through-hole 2621 of the housing section 262 By placing the second through-hole 2621 of the housing 262 on the second wall 2623, it is advantageous to increase the path for gas to enter the intake port 2312 of the valve body 231 from the second through-hole 2621, mitigating the phenomenon of electrolyte overflowing with gas. By placing the second through-hole 2621 of the housing 262 on the second wall 2623, it is advantageous to realize that the intake port 2312 and the second through-hole 2621 are installed in correspondence, improving the smoothness of the check valve 23 in discharging gas from inside the housing 21.

[0393] In some embodiments of this application, referring to Figures 5 and 17, the housing portion 262 and the main body portion 261 are integrally molded. In other words, the housing portion 262 and the main body portion 261 have a one-piece structure.

[0394] By integrating the main body 261 and the housing 262 of the insulating member 26 into a single molded structure, it is advantageous to improve the structural strength and stability of the structure in which the housing 262 is connected to the main body 261.

[0395] Of course, the structure of the insulating member 26 is not limited to this, and the insulating member 26 may have other structures. For example, referring to Figures 18 and 19, Figure 18 is a local cross-sectional view of a battery cell 20 according to some further embodiments of this application, and Figure 19 is a local cross-sectional view of the insulating member 26 of the battery cell 20 according to some further embodiments of this application. The housing portion 262 and the main body portion 261 are installed separately. In other words, the housing portion 262 and the main body portion 261 are separate structures.

[0396] By installing the main body 261 and housing 262 of the insulating member 26 in a separate structure, it is advantageous to reduce the difficulty of processing the insulating member 26, thereby reducing the manufacturing cost of the insulating member 26.

[0397] According to some embodiments of the present application, continuing to refer to Figures 18 and 19, in embodiments in which the main body 261 and housing 262 of the insulating member 26 are separate structures, the housing 262 may further include a burring portion 2624, the burring portion 2624 being connected to the end of the first wall 2622 away from the second wall 2623, at least a portion of the burring portion 2624 being installed stacked with the main body 261, and the burring portion 2624 being in contact with the side of the main body 261 facing the wall 211.

[0398] Here, at least a portion of the burring portion 2624 is installed stacked with the main body portion 261, and the burring portion 2624 abuts against the side of the main body portion 261 facing the wall portion 211, that is, the burring portion 2624 is located on the side of the main body portion 261 facing the wall portion 211, and the burring portion 2624 and the main body portion 261 abut each other along the thickness direction X of the wall portion, so that the burring portion 2624 and the second wall 2623 are located on opposite sides of the main body portion 261, thereby allowing the housing portion 262 to be locked onto the main body portion 261. Of course, in other embodiments, the burring portion 2624 of the housing portion 262 may be located on the side of the main body portion 261 away from the wall portion 211, and the burring portion 2624 and the main body portion 261 are connected by adhesive.

[0399] In Figure 19, an assembly hole 2611 is made in the main body 261, and the assembly hole 2611 penetrates both sides of the main body 261 along the thickness direction X of the wall, and the first wall 2622 of the housing 262 is drilled into the assembly hole 2611, so that the burring portion 2624 and the second wall 2623 are located on both sides of the main body 261, respectively.

[0400] For example, the thickness direction of the burring 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 burring portion 2624 is an annular structure surrounding the outside of the first wall 2622. Of course, in other embodiments, the burring portion 2624 may be a plurality of protruding structures projecting from the outside of the first wall 2622.

[0401] A burring section 2624 is further installed in the housing section 262, and the burring section 2624 is connected to the end of the first wall 2622 away from the second wall 2623. At least a portion of the burring section 2624 is installed stacked with the main body section 261 in the thickness direction X of the wall section, and the burring section 2624 abuts against the side of the main body section 261 facing the wall section 211, thereby enabling the housing section 262 to be connected to the main body section 261, resulting in a simple structure and easy assembly.

[0402] According to some embodiments of this application, referring to Figures 18 and 19, a accommodating groove 2612 is provided on the surface of the main body 261 facing the wall 211 along the thickness direction X of the wall, and the burring portion 2624 is housed within the accommodating groove 2612.

[0403] Here, the accommodating groove 2612 is installed on the surface of the main body portion 261 that is away from the electrode assembly 22, and the accommodating groove 2612 penetrates the hole wall of the assembly hole 2611, so that the burring portion 2624 is accommodated in the accommodating groove 2612 and can be overlapped on the groove bottom surface of the accommodating groove 2612.

[0404] By providing a receiving groove 2612 for accommodating the burring portion 2624 on the surface of the main body portion 261 facing the wall portion 211, the space occupied in the thickness direction X of the wall portion between the burring portion 2624 and the main body portion 261 can be reduced, and the effect of interference that the burring portion 2624 has on the mutual contact between the main body portion 261 and the wall portion 211 can be reduced.

[0405] In some embodiments, continuing to refer to Figures 18 and 19, along the thickness direction X of the wall, the surface of the burring portion 2624 facing the wall portion 211 is flush with the surface of the main body portion 261 facing the wall portion 211.

[0406] Here, the surface of the burring 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 size of the wall portion of the burring portion 2624 in the thickness direction X is the same as the groove depth of the receiving groove 2612.

[0407] Selectively, the surface of the main body facing the wall portion 211 is used to contact the wall portion 211, thereby the burring portion 2624 is sandwiched between the wall portion 211 and the bottom surface of the housing groove 2612 along the thickness direction X of the wall portion.

[0408] By positioning the surface of the burring portion 2624 facing the wall portion 211 and the surface of the main body portion 261 facing the wall portion 211 so that they are flush with each other, the wall portion 211 and the bottom surface of the housing groove 2612 fit together, providing a certain level of clamping and stopping action for the burring portion 2624, thereby reducing the rattling phenomenon of the housing portion 262 along the thickness direction X of the wall portion.

[0409] Referring to some embodiments of this application, specifically with reference to Figures 4, 5 and 6, and further with Figures 20, 21 and 22, Figure 20 is a plan view of a battery cell 20 (after the protective sheet 29 has been removed) according to some embodiments of this application, Figure 21 is a localized magnified view of A of the battery cell 20 shown in Figure 20, and Figure 22 is a schematic diagram of the connection between the shielding material 27 and the wall portion 211 of the battery cell 20 according to some embodiments of this application. The battery cell 20 may further include a shielding material 27, which is attached to the wall portion 211, and along the thickness direction X of the wall portion, the shielding material 27 is located on the side away from the electrode assembly 22 of the check valve 23, and the shielding material 27 covers the check valve 23. The check valve 23 has an exhaust port 2313 for discharging gas from inside the housing 21, and an exhaust passage 28 is formed between the shielding material 27 and the wall portion 211, or the exhaust passage 28 is installed on the shielding material 27, and the exhaust passage 28 communicates the exhaust port 2313 with the outside of the housing 21.

[0410] Here, the structure by which the shielding material 27 is attached to the wall portion 211 can vary. For example, the shielding material 27 can be attached to the wall portion 211 by welding, interlocking, bolting, locking, or bonding.

[0411] The shielding material 27 is located on the side of the check valve 23 away from the electrode assembly 22, and the shielding material 27 covers the check valve 23, meaning that the shielding material 27 and the check valve 23 are aligned along the thickness direction X of the wall, and the projection of the check valve 23 in the thickness direction X of the wall lies within the shielding material 27.

[0412] An exhaust passage 28 is formed between the shielding material 27 and the wall portion 211, or the exhaust passage 28 is installed on the shielding material 27, and the exhaust passage 28 connects the exhaust port 2313 to the outside of the housing 21, that is, the exhaust port 2313 of the check valve 23 communicates with the outside of the housing 21 via the exhaust passage 28, so that the check valve 23 can discharge gas from inside the housing 21. The exhaust passage 28 may be installed on the shielding material 27, that is, the exhaust passage 28 is a through-hole installed on the shielding material 27, or the exhaust passage 28 may be formed between the shielding material 27 and the wall portion 211, that is, the exhaust passage 28 is a gap formed between the shielding material 27 and the wall portion 211.

[0413] For example, in Figures 21 and 22, the exhaust passage 28 is formed between the shielding material 27 and the wall portion 211; that is, the exhaust passage 28 is the gap formed between the shielding material 27 and the wall portion 211.

[0414] The battery cell 20 is further equipped with a shielding material 27 located on the side away from the electrode assembly 22 of the check valve 23. The shielding material 27 is attached to the wall portion 211, and the shielding material 27 covers the check valve 23. This allows the shielding material 27 to provide a certain level of protection and shielding to the check valve 23, reducing the phenomenon of wear or damage to the check valve 23 in the external environment, and reducing the risk of foreign matter or particulate matter from the external environment entering the check valve 23, which is advantageous for improving the service life of the check valve 23. On the other hand, covering the check valve 23 with the shielding material 27 improves the aesthetic appearance of the outer surface of the battery cell 20. On the other hand, it facilitates connection to other components such as detection elements on the side of the shielding material 27 away from the check valve 23, reducing the influence of interference from the connection of other components such as detection elements in the area of ​​the wall portion 211 where the check valve 23 is installed.

[0415] According to some embodiments of this 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 that is away from the electrode assembly 22, and a mounting groove 2113 is provided on the first surface 2112, and a mounting hole 2111 is provided on the bottom surface of the mounting groove 2113, at least a portion of the check valve 23 is installed in the mounting hole 2111, and at least a portion of the shielding material 27 is housed in the mounting groove 2113.

[0416] Here, a mounting groove 2113 is provided on the first surface 2112, and a mounting hole 2111 is provided on the bottom surface of the mounting groove 2113. That is, the mounting hole 2111 penetrates the bottom surface of the mounting groove 2113, so that the mounting hole 2111 communicates with the outside of the housing 21 via the mounting groove 2113.

[0417] At least a portion of the shielding material 27 is housed within the mounting groove 2113; that is, the shielding material 27 may be located entirely within the mounting groove 2113, or only partially within the mounting groove 2113. Exemplarily, in Figure 5, the entire shielding material 27 is located within the mounting groove 2113.

[0418] A mounting groove 2113 is provided on the first surface 2112 of the wall portion 211, which is separated from the electrode assembly 22, and at least a portion of the shielding material 27 is housed in the mounting groove 2113. This reduces the space occupied by the shielding material 27 in the thickness direction X of the wall portion 211, which is advantageous for optimizing the volume of the battery cell 20. At the same time, the mounting groove 2113 can provide a fixed positioning and stopper role for the shielding material 27, which is advantageous for reducing the difficulty of assembly when connecting the shielding material 27 to the wall portion 211.

[0419] According to some embodiments of this application, with reference to Figures 20, 21 and 22, the exhaust passage 28 includes a third exhaust gap 281, which is formed between the shielding material 27 and the groove side of the mounting groove 2113, and the third exhaust gap 281 is used to communicate the exhaust port 2313 with the outside of the housing 21.

[0420] Here, the third exhaust gap 281 is used to connect the exhaust port 2313 to the outside of the housing 21. The third exhaust gap 281 may communicate directly with the exhaust port 2313. For example, at least a portion of the projection of the wall portion of the third exhaust gap 281 in the thickness direction X is located within the mounting hole 2111, so that the exhaust port 2313 of the check valve 23 installed in the mounting hole 2111 is in direct communication with the third exhaust gap 281. Of course, the third exhaust gap 281 may also communicate indirectly with the exhaust port 2313. For example, in Figure 22, the exhaust passage 28 may further include a fourth exhaust gap 282, which is formed between the shielding material 27 and the bottom surface of the mounting groove 2113. The fourth exhaust gap 282 communicates with the third exhaust gap 281 and the exhaust port 2313 of the check valve 23.

[0421] By forming a third exhaust gap 281 that communicates with the outside of the housing 21 between the shielding material 27 and the groove side of the mounting groove 2113, the gas discharged from the check valve 23 can be discharged to the outside of the housing 21 through the third exhaust gap 281. A battery cell 20 employing such a structure does not require drilling holes in the shielding material 27, which is advantageous in reducing the difficulty of processing and also improves the aesthetic appearance of the battery cell 20.

[0422] It should be explained that the structure of the third exhaust gap 281 may vary, and in some embodiments, referring to Figure 21, the outer circumferential surface of the shielding material 27 includes a first corner surface 271 and at least two first side surfaces 272, the first corner surface 271 being connected to two adjacent first side surfaces 272. The groove side of the mounting groove 2113 includes a second corner surface 2113a and at least two second side surfaces 2113b, the second corner surface 2113a being connected to two adjacent second side surfaces 2113b, each second side surface 2113b being connected to one first side surface 272, forming a third exhaust gap 281 between the second corner surface 2113a and the first corner surface 271.

[0423] Here, the first corner surface 271 is connected to two adjacent first side surfaces 272, that is, in the circumferential direction of the shielding material 27, the first corner surface 271 is located between the two first side surfaces 272 and is connected to the two first side surfaces 272, in other words, the first corner surface 271 is the surface at the corner of the outer circumferential surface of the shielding material 27.

[0424] The second corner surface 2113a is connected to 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 is connected to the two second side surfaces 2113b, in other words, the second corner surface 2113a is the surface at the corner of the groove side surface of the mounting groove 2113.

[0425] Each first side surface 272 of the shielding material 27 abuts against and connects with the corresponding second side surface 2113b on the groove side of the mounting groove 2113, so that the first corner surface 271 of the shielding material 27 and the second corner surface 2113a on the groove side of the mounting groove 2113 are positioned facing each other, thereby forming a third exhaust gap 281 between the first corner surface 271 and the second corner surface 2113a.

[0426] Selectively, the connection structure between the first side 272 and the second side 2113b may be of various types, such as welding, bonding, or interlocking.

[0427] For example, in Figures 20 and 21, both the shielding material 27 and the mounting groove 2113 have a rectangular structure, so that four first corner surfaces 271 are formed corresponding to the four corner locations of the shielding material 27, and correspondingly, four second corner surfaces 2113a are formed corresponding to the four corner locations of the groove side surface of the mounting groove 2113, thereby forming four third exhaust gaps 281 between the shielding material 27 and the groove side surface of the mounting groove 2113.

[0428] Of course, the structure of the third exhaust gap 281 formed between the shielding material 27 and the groove side of the mounting groove 2113 is not limited to this. For example, in other embodiments, referring to Figure 23, Figure 23 is a schematic diagram of the structure of another embodiment of the shielding material 27 according to some embodiments of this application. A second recessed groove 273 is provided on the outer circumferential surface of the shielding material 27, and the outer circumferential surface of the shielding material 27 is connected to the groove side of the mounting groove 2113 and used to form a third exhaust gap 281 between the groove bottom surface of the second recessed groove 273 and the groove side of the mounting groove 2113. In such embodiments, the outer circumferential surface of the shielding material 27 may be welded or bonded to the groove side of the mounting groove 2113. Similarly, in other embodiments, referring to Figure 24, Figure 24 is a schematic diagram of the structure of another embodiment of the shielding material 27 according to some embodiments of this application. Multiple contact portions 274 are provided on the outer circumferential surface of the shielding material 27. These contact portions 274 are arranged at intervals along the circumferential direction of the shielding material 27, and are connected to the groove side of the mounting groove 2113. They are used to form a third exhaust gap 281 between the area of ​​the shielding material 27 where the contact portions 274 are not installed and the groove side of the mounting groove 2113. In such embodiments, the contact portions 274 and the groove side of the mounting groove 2113 may be joined by interlocking, welding, or bonding.

[0429] Two adjacent first sides 272 on the outer circumferential surface of the shielding material 27 are connected by a first corner surface 271, and two connected second sides 2113b on the groove side of the mounting groove 2113 are connected by a second corner surface 2113a, each first side 272 is connected to one second side 2113b, and a third exhaust gap is formed between the first corner surface 271 and the second corner surface 2113a, that is, a third exhaust gap is formed at the corner of the shielding material 27 and the mounting groove 2113. By forming a gap 281, it is easy to form a third exhaust gap 281 between the outer surface of the shielding material 27 and the groove side of the mounting groove 2113, resulting in a simple structure and easy implementation. At the same time, it is advantageous to improve the connection area between the outer surface of the shielding material 27 and the groove side of the mounting groove 2113, and is advantageous to improve the robustness of the connection of the shielding material 27 to the wall portion 211.

[0430] According to some embodiments of this application, referring to Figures 20 and 21, both the first corner surface 271 and the second corner surface 2113a are arcuate surfaces, and the radius of the first corner surface 271 is greater than the radius of the second corner surface 2113a.

[0431] Here, both the first corner surface 271 and the second corner surface 2113a are arc surfaces; that is, the first corner surface 271 is a surface formed by the rounded corner of the outer circumferential surface of the shielding material 27, and similarly, the second corner surface 2113a is a surface formed by the rounded corner of the groove side surface of the mounting groove 2113. Of course, in other embodiments, the first corner surface 271 may be a surface formed by the chamfer of the outer circumferential surface of the shielding material 27, and the second corner surface 2113a may be a surface formed by the chamfer of the groove side surface of the mounting groove 2113.

[0432] The radius of the first corner surface 271 is greater than the radius of the second corner surface 2113a, that is, the diameter of the circular corner on the outer surface of the shielding material 27 is greater than the diameter of the circular corner on the groove side of the mounting groove 2113.

[0433] By setting both the first corner surface 271 and the second corner surface 2113a on arcuates and making the radius of the first corner surface 271 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, resulting in a simple structure that is easy to manufacture and process.

[0434] In some embodiments, the first side surface 272 is welded to the second side surface 2113b.

[0435] By installing the first side surface 272 and the second side surface 2113b in a structure that welds them together, it is advantageous to improve the robustness of the connection between the shielding material 27 and the groove side surface of the mounting groove 2113, and improve the structural stability of the shielding material 27 assembled on the wall portion 211.

[0436] In some embodiments, referring to Figures 20 and 21, the cross-section of the wall portion of the shielding material 27 perpendicular to the thickness direction X is rectangular, and the outer surface of the shielding material 27 includes four first side surfaces 272 and four first corner surfaces 271, with a third exhaust gap 281 formed in at least one of the first corner surfaces 271.

[0437] Here, a third exhaust gap 281 is formed in at least one first corner surface 271, that is, the third exhaust gap 281 may be formed at a position where only one of the four first corner surfaces 271 of the shielding material 27 is located, or the third exhaust gap 281 may be formed at a position where two, three, or four first corner surfaces 271 are located.

[0438] It should be noted that in other embodiments, the cross-section of the shielding material 27 perpendicular to the thickness direction X of the wall portion may be a triangle, pentagon, hexagon, or trapezoid, etc.

[0439] By installing the shielding material 27 in a rectangular plate-like structure, the four sides of the shielding material 27 form four first side surfaces 272, and four first corner surfaces 271 are formed at the four right angles of the shielding material 27, resulting in a simple structure and easy manufacturing.

[0440] According to some embodiments of this application, referring to Figure 22, the exhaust passage 28 may further include a fourth exhaust gap 282, which is formed between the shielding material 27 and the bottom surface of the mounting groove 2113, and the fourth exhaust gap 282 communicates with the third exhaust gap 281 and the exhaust port 2313.

[0441] Here, the fourth exhaust gap 282 is formed between the shielding material 27 and the bottom surface of the mounting groove 2113, and the shielding material 27 and the bottom surface of the mounting groove 2113 may be arranged with a gap in between along the thickness direction X of the wall, thereby forming the fourth exhaust gap 282 between the surface of the bottom surface of the shielding material 27 facing the mounting groove 2113 and the bottom surface of the mounting groove 2113. Alternatively, a first groove 2751 may be installed on the surface of the bottom surface of the shielding material 27 facing the mounting groove 2113, thereby forming the fourth exhaust gap 282 between the bottom surface of the first groove 2751 and the bottom surface of the mounting groove 2113.

[0442] It should be explained that in other embodiments, a fourth exhaust gap 282 may be formed between the bottom surface of the first groove 2751 and the bottom surface of the groove of the shielding material 27 facing the mounting groove 2113 by installing the first groove 2751 on the bottom surface of the mounting groove 2113.

[0443] The exhaust passage 28 further includes a fourth exhaust gap 282 formed between the shielding material 27 and the bottom surface of the mounting groove 2113, and the fourth exhaust gap 282 communicates with the third exhaust gap 281 and the exhaust port 2313, thereby mitigating the phenomenon in which exhaust between the exhaust port 2313 and the third exhaust gap 281 is obstructed after the shielding material 27 comes into contact with the bottom surface of the mounting groove 2113, and thereby improving the smoothness of gas discharge from the exhaust port 2313 of the check valve 23 to the third exhaust gap 281.

[0444] Referring to Figures 5 and 22, and further to Figure 25, which is a bottom view of a shielding material 27 for a battery cell 20 according to some embodiments of the present application. Along the thickness direction X of the wall portion, the shielding material 27 has a third surface 275 facing a check valve 23, the third surface 275 overlapping the groove bottom surface of a mounting groove 2113, the third surface 275 having a first groove 2751, and a fourth exhaust gap 282 being formed between the groove bottom surface of the first groove 2751 and the groove bottom surface of the mounting groove 2113.

[0445] Here, the third surface 275 overlaps with the bottom surface of the mounting groove 2113, that is, the portion of the third surface 275 abuts against the bottom surface of the mounting groove 2113, in other words, along the thickness direction X of the wall portion, the shielding material 27 abuts against the bottom surface of the mounting groove 2113.

[0446] A fourth exhaust gap 282 is formed between the bottom surface of the first groove 2751 and the bottom surface of the mounting groove 2113, that is, the bottom surface of the first groove 2751, the side surface of the first groove 2751, and the bottom surface of the mounting groove 2113 all define the fourth exhaust gap 282.

[0447] By overlapping the third surface 275 of the shielding material 27 onto the bottom surface of the mounting groove 2113, the shielding material 27 comes into contact with the bottom surface of the mounting groove 2113, improving the structural stability and reliability of the shielding material 27 being installed in the mounting groove 2113. Furthermore, by installing the first groove 2751 on the third surface 275, a fourth exhaust gap 282 is formed between the bottom surface of the first groove 2751 and the bottom surface of the mounting groove 2113. As a result, the gas discharged from the exhaust port 2313 of the check valve 23 can enter the third exhaust gap 281 via the first groove 2751 and then be discharged to the outside of the housing 21. This ensures that the shielding material 27 comes into contact with the bottom surface of the mounting groove 2113, while simultaneously enabling communication between the third exhaust gap 281 and the exhaust port 2313 via the first groove 2751.

[0448] In some embodiments, referring to Figures 20, 21, and 25, a plurality of third exhaust gaps 281 are formed between the shielding material 27 and the groove side of the mounting groove 2113, the plurality of third exhaust gaps 281 are spaced apart along the circumferential direction of the shielding material 27, and a plurality of first grooves 2751 are provided on the third surface 275, with each third exhaust gap 281 communicating with one of the first grooves 2751.

[0449] In an embodiment in which the third exhaust gap 281 is formed between the first corner surface 271 and the second corner surface 2113a, referring to Figure 25, the first groove 2751 extends along the radial direction of the shielding material 27, and the first groove 2751 penetrates 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 communicate with the third exhaust gap 281 formed between the first corner surface 271 and the second corner surface 2113a.

[0450] For example, the shielding material 27 has four first corner surfaces 271, and each of the first corner surfaces 271 has a third exhaust gap 281 formed therein, and correspondingly, four first grooves 2751 are provided on the third surface 275 of the shielding material 27, and each first groove 2751 penetrates one of the first corner surfaces 271.

[0451] By forming multiple third exhaust gaps 281 between the shielding material 27 and the groove side of the mounting groove 2113, and by having each third exhaust gap 281 communicate with a single first groove 2751, it is advantageous to further improve exhaust efficiency.

[0452] According to some embodiments of this application, referring to Figures 5 and 25, a second groove 2752 may be further provided on the third surface 275, and a plurality of first grooves 2751 are provided around the second groove 2752, all communicating with the second groove 2752, which communicates with the exhaust port 2313.

[0453] Exemplary, four first grooves 2751 are provided on the third surface 275 of the shielding material 27, the four first grooves 2751 are spaced apart along the circumferential direction of the second groove 2752, the first grooves 2751 extend along the radial direction of the shielding material 27 and penetrate the groove sides of the second groove 2752.

[0454] A second groove 2752 is provided on the third surface 275 of the shielding material 27 facing the check valve 23, the second groove 2752 is in communication with the exhaust port 2313 of the check valve 23, and a plurality of first grooves 2751 are provided around the second groove 2752, all of which are in communication with the second groove 2752. As a result, the gas discharged from the exhaust port 2313 of the check valve 23 enters the second groove 2752 and then passes through the plurality of first grooves 2751 to the corresponding third exhaust gaps 281 and is discharged to the outside of the housing 21, which is advantageous for improving exhaust efficiency and can mitigate the phenomenon of gas accumulating between the shielding material 27 and the check valve 23.

[0455] In some embodiments, referring to Figure 5, along the thickness direction X of the wall, the exhaust port 2313 is located at the end away from the electrode assembly 22 of the check valve 23, the exhaust port 2313 is located facing the second groove 2752, and the projection of the exhaust port 2313 is located within the second groove 2752.

[0456] Exemplary, the entire projection of the wall portion of the check valve 23 in the thickness direction X is located within the second groove 2752.

[0457] The exhaust port 2313 of the check valve 23 and the second groove 2752 are installed facing each other, and the projection of the wall portion of the exhaust port 2313 in the thickness direction X is positioned within the second groove 2752. As a result, the second groove 2752 covers the exhaust port 2313 in the thickness direction X of the wall portion, and the gas discharged from the exhaust port 2313 of the check valve 23 can enter the second groove 2752 directly, which is advantageous for improving exhaust smoothness and exhaust efficiency.

[0458] According to some embodiments of this application, referring to Figure 5, the shielding material 27 does not protrude beyond the first surface 2112 along the thickness direction X of the wall.

[0459] Here, the shielding material 27 does not protrude beyond the first surface 2112, that is, the shielding material 27 does not extend from the mounting groove 2113 in the thickness direction X of the wall, and so the entirety of the shielding material 27 is located within the mounting groove 2113.

[0460] By installing the shielding material 27 so that it does not protrude beyond the first surface 2112 that is separated from the electrode assembly 22 of the wall portion 211 in the thickness direction X of the wall portion, the mounting groove 2113 provides a certain level of protection to the shielding material 27, and further reduces the wear phenomenon of the shielding material 27.

[0461] In some embodiments, continuing to refer to Figure 5, the shielding material 27 has a fourth surface 276 that is away from the check valve 23, and the fourth surface 276 is flush with the first surface 2112.

[0462] By installing the shielding material 27 in a structure where the fourth surface 276, which is separated from the check valve 23, and the first surface 2112, which is separated from the electrode assembly 22 of the wall portion 211, are flush with each other, it is advantageous to further improve the aesthetic appearance of the outer surface of the battery cell 20, and it also facilitates the installation of an information code on the fourth surface 276 of the shielding material 27, or the connection to other components such as a detection element.

[0463] It should be explained that the information code may be a QR code, barcode, numbers, or letters, and information of the battery cell 20 is acquired by scanning or manually entering the information code. The detection element may include a circuit board and a sampling terminal electrically connected to the circuit board, and the sampling terminal may include a metal piece (e.g., a nickel piece), a temperature sensor, etc.

[0464] In some embodiments, the shielding material 27 is fixedly connected to the wall portion 211.

[0465] The structure by which the shielding material 27 is selectively and permanently connected to the wall portion 211 may vary. For example, the shielding material 27 may be connected to the wall portion 211 by welding, bonding, or interlocking.

[0466] By installing the shielding material 27 in a structure that is fixedly connected to the wall portion 211, it is advantageous to reduce the risk of the shielding material 27 detaching from the wall portion 211 during use, and the robustness of the connection between the shielding material 27 and the wall portion 211 is improved, making it easier to install information codes on the shielding material 27 or connect them to other components such as detection elements.

[0467] According to some embodiments of this application, referring to Figures 3 and 4, the battery cell 20 may further include a protective sheet 29, which is installed on the side of the wall portion 211 away from the electrode assembly 22, and an information collection hole 291 is provided on the protective sheet 29 that penetrates the protective sheet 29, and the projection of the information collection hole 291 in the thickness direction X of the wall portion is located within the shielding material 27.

[0468] Here, the protective sheet 29 is installed on the side of the wall portion 211 away from the electrode assembly 22, that is, the protective sheet 29 is installed on the outer surface of the wall portion 211 and plays a role in providing a certain level of protection to the wall portion 211. The material of the protective sheet 29 can vary, for example, it may be rubber, silicone rubber, or plastic.

[0469] An information collection hole 291 is provided on the protective sheet 29, penetrating the protective sheet 29. The information collection hole 291 serves to expose the housing 21 of the battery cell 20, making it easy to install an information code on the housing 21 or connect it to a detection element for sampling.

[0470] The projection of the wall portion of the information collection hole 291 in the thickness direction X is located within the shielding material 27, that is, the information collection hole 291 is installed in correspondence with the shielding material 27, and the shielding material 27 covers the information collection hole 291. As a result, the area where the information collection hole 291 is exposed is the surface of the shielding material 27, and thus an information code can be installed on the shielding material 27 or connected to a detection element for sampling.

[0471] For example, the exposed surface corresponding to the information gathering hole 291 of the shielding material 27 is planar.

[0472] The structure in which the protective sheet 29 is selectively installed on the wall portion 211 may vary, and the protective sheet 29 can be installed on the wall portion 211 by means of adhesive, suction, or other methods.

[0473] It should be explained that in an embodiment in which electrode terminals 24 are installed on the wall portion 211, referring to Figures 3 and 4, a second retraction hole 292 is provided along the thickness direction X of the wall portion at a position corresponding to the electrode terminals 24 in the protective sheet 29. The second retraction hole 292 penetrates both sides of the protective sheet 29 and is used for the electrode terminals 24 to pass through and retract. Exemplarily, two electrode terminals 24 are installed on the wall portion 211, and correspondingly, two second retraction holes 292 are provided in the protective sheet 29, each second retraction hole 292 used for the passage of one electrode terminal 24.

[0474] In an embodiment in which the pressure relief mechanism 25 is installed on the wall portion 211, referring to Figures 3 and 4, a third retraction hole 293 is installed along the thickness direction X of the wall portion at a position corresponding to the pressure relief mechanism 25 in the protective sheet 29. The third retraction hole 293 penetrates both sides of the protective sheet 29, and along the thickness direction X of the wall portion, the projection of the pressure relief mechanism 25 is located within the third retraction hole 293, so that the third retraction hole 293 can retract the pressure relief mechanism 25.

[0475] A protective sheet 29 is further installed on the battery cell 20, and by installing the protective sheet 29 on the side of the wall portion 211 away from the electrode assembly 22, the wall portion 211 can be protected. Furthermore, an information collection hole 291 is installed on the protective sheet 29, and the projection of the information collection hole 291 in the thickness direction X of the wall portion is positioned within the shielding material 27, so that the information collection hole 291 is installed in correspondence with the shielding material 27. An information code is installed on the shielding material 27, or connected to a component such as a detection element for sampling, and the sampled detection element This design makes it easier to reduce damage and pulling of the check valve 23 by components such as children, while also improving the aesthetic appearance of the outer surface of the battery cell 20. On the other hand, by installing the shielding material 27 and the information collection holes 291 of the protective sheet 29 in correspondence, the area from which the battery cell 20 is exhausted through the check valve 23 can be installed in correspondence with the area where the information collection holes 291 of the protective sheet 29 are installed. This saves space occupied on the outer surface of the housing 21 by the information collection holes 291 and the shielding material 27, which is advantageous for improving the degree of integration of the battery cell 20.

[0476] According to some embodiments of this application, referring to Figure 3, and further to Figure 26, Figure 26 is a schematic diagram of the connection between the protective sheet 29 and the wall portion 211 according to some embodiments of this application. An exhaust port 283 communicating with the outside of the housing 21 is formed at one end of the exhaust passage 28, and the protective sheet 29 covers the exhaust port 283 along the thickness direction X of the wall portion.

[0477] In this embodiment, an exhaust port 283 is formed at one end of the exhaust passage 28, which communicates with the outside of the housing 21. That is, the exhaust port 283 is formed at the end of the exhaust passage 28, which is formed between the shielding material 27 and the wall portion 211, that communicates with the outside of the housing 21. In this embodiment, the exhaust passage 28 includes a third exhaust gap 281 and a fourth exhaust gap 282, and the exhaust port 283 is formed at the end of the third exhaust gap 281 that communicates with the outside of the housing 21.

[0478] Along the thickness direction X of the wall, the protective sheet 29 covers the exhaust port 283, meaning that the projection of the exhaust passage 28 onto the wall of the exhaust port 283 in the thickness direction X is located within the protective sheet 29.

[0479] It should be noted that in some embodiments, the protective sheet 29 may cover the entire check valve 23 to protect it, in which case the shielding material 27 may not be installed. When the protective sheet 29 covers the entire check valve 23, a gas passage is formed between the protective sheet 29 and the wall portion 211, allowing the gas discharged from the exhaust port 2313 of the check valve 23 to be released to the outside of the battery cell 20.

[0480] By installing the protective sheet 29 in a structure that covers the exhaust port 283 at one end of the exhaust passage 28 formed between the shielding material 27 and the wall portion 211, the protective sheet 29 can act as a shield for the exhaust passage 28, improving the aesthetic appearance of the outer surface of the battery cell 20. At the same time, it can reduce the risk of foreign matter or particulate matter from the external environment entering the exhaust passage 28 through the exhaust port 283 and blocking the exhaust passage 28, which is advantageous in improving the reliability of the battery cell 20.

[0481] In some embodiments, referring to Figure 26, and further to Figure 27, Figure 27 is a schematic diagram of the connection between the protective sheet 29 and the 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 sheet 29 facing the wall 211 to bond the protective sheet 29 to the wall 211. A first retractable hole 301 is provided in the adhesive layer 30 at a position corresponding to the information collection hole 291, and along the thickness direction X of the wall, the projections of both the information collection hole 291 and the exhaust port 283 are located within the first retractable hole 301.

[0482] Here, the adhesive layer 30 serves to bond the protective sheet 29 and the wall portion 211. For example, the adhesive layer 30 may be an adhesive or double-sided tape placed between the protective sheet 29 and the wall portion 211.

[0483] 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 retraction hole 301. That is, the first retraction hole 301 covers the information collection hole 291 and the exhaust port 283 in an area limited by the projection of a plane perpendicular to the thickness direction X of the wall. In other words, the first retraction hole 301 can retract the information collection hole 291 and the exhaust port 283 in the thickness direction X of the wall.

[0484] For example, in Figure 26, the exhaust passage 28 includes a third exhaust gap 281, which is formed between the shielding material 27 and the groove side of the mounting groove 2113, and the exhaust port 283 is formed at the end of the third exhaust gap 281 that communicates with the outside of the housing 21, and accordingly, the projection of the wall portion of the mounting groove 2113 and the shielding material 27 in the thickness direction X is located within the first retraction hole 301, so that the first retraction hole 301 can retract the mounting groove 2113 and the shielding material 27, thereby retracting the information collection hole 291 and the exhaust port 283.

[0485] Here, the area limited by the projection of the wall portion of the first retraction hole 301 in the thickness direction X covers the information collection hole 291 and the mounting groove 2113, and since the projection of the wall portion of the information collection hole 291 in the thickness direction X is located within the shielding material 27, the area of ​​the first retraction hole 301 is made larger than the area of ​​the mounting groove 2113, and the area of ​​the mounting groove 2113 is made larger than the area of ​​the information collection hole 291.

[0486] By installing the adhesive layer 30 on the side of the protective sheet 29 facing the wall portion 211, the protective sheet 29 can be bonded to the wall portion 211 via the adhesive layer 30, which is advantageous in reducing the difficulty of assembling the protective sheet 29 and improving the connection stability of the protective sheet 29 when it is installed on the wall portion 211. Furthermore, by installing the first retraction hole 301 at a position corresponding to the information collection hole 291 of the adhesive layer 30, and by positioning both the projection of the information collection hole 291 of the protective sheet 29 and the exhaust port 283 formed at one end of the exhaust passage 28 in the thickness direction X of the wall portion within the first retraction hole 301, the barrier of the exhaust port 283 of the exhaust passage 28 by the adhesive layer 30 is reduced, so that the gas discharged through the exhaust passage 28 can pass through the gap between the protective sheet 29 and the wall portion 211 and enter the information collection hole 291 before being discharged, thereby enabling the protective sheet 29 to be bonded to the wall portion 211 and simultaneously reducing the effect of exhaust on the check valve 23.

[0487] According to some embodiments of this application, referring to Figures 3, 4 and 26, an exhaust port 283 communicating with the outside of the housing 21 is formed at one end of the exhaust passage 28, and the battery cell 20 further includes a protective sheet 29, the protective sheet 29 is installed on the side of the wall portion 211 away from the electrode assembly 22, and the protective sheet 29 covers the exhaust port 283.

[0488] Here, the protective sheet 29 covers the exhaust port 283, meaning that the projection of the exhaust passage 28 onto the wall portion of the exhaust port 283 in the thickness direction X lies within the protective sheet 29.

[0489] It should be explained that in an embodiment in which the adhesive layer 30 is installed on the side of the protective sheet 29 facing the wall portion 211, and in an embodiment in which the information collection hole 291 is not installed corresponding to the shielding material 27, a passage is formed in the adhesive layer 30 to connect the exhaust port 283 to the outside of the housing 21 so that gas inside the housing 21 can be discharged.

[0490] By installing a protective sheet 29 on the side of the wall portion 211 away from the electrode assembly 22, and by having the protective sheet 29 cover the exhaust port 283 at one end of the exhaust passage 28 formed between the shielding material 27 and the wall portion 211, the protective sheet 29 can act as a shield for the exhaust passage 28, improving the aesthetic appearance of the outer surface of the battery cell 20. At the same time, it is possible to reduce the risk of foreign matter or particulate matter from the external environment entering the exhaust passage 28 through the exhaust port 283 and blocking the exhaust passage 28, which is advantageous in improving the reliability of the battery cell 20.

[0491] According to some embodiments of this application, referring to Figure 5, a mounting hole 2111 is provided in the wall portion 211, and at least a portion of the check valve 23 is mounted in the mounting hole 2111, which is the liquid injection hole of the battery cell 20.

[0492] In embodiments where the mounting hole 2111 is the electrolyte injection hole of the battery cell 20, the check valve 23 must be assembled into the mounting hole 2111 only after the electrolyte has been injected into the housing 21 through the electrolyte injection hole.

[0493] By placing the mounting hole 2111 for assembling the check valve 23 in the liquid injection hole, liquid can be injected into the housing 21 through the mounting hole 2111 while the check valve 23 is being assembled in the mounting hole 2111. This eliminates the need to separately drill a liquid injection hole on the housing 21, which is advantageous for improving the production efficiency of the battery cell 20 and for reducing the manufacturing cost of the battery cell 20.

[0494] According to some embodiments of this application, with reference to Figures 3 and 4, the housing 21 may include a case 212 and an end cap 213. Inside the case 212 is a housing cavity having an opening 2121, which is used to house an electrode assembly 22, and the end cap 213 seals the opening 2121, and the end cap 213 is a wall portion 211.

[0495] Here, the end cap 213 is the wall portion 211, meaning that the check valve 23 is installed on the end cap 213.

[0496] It should be noted that the structure of the battery cell 20 is not limited to this, and in some embodiments, the battery cell 20 may have other structures. For example, the case 212 may include a wall portion 211, meaning the check valve 23 is mounted on one wall of the case 212, and the check valve 23 may be mounted on a bottom wall where the case 212 and the end cap 213 are installed facing each other, or the case 212 may be mounted on a side wall adjacent to and connected to the end cap 213.

[0497] By installing the wall portion 211 of the housing 21 onto the end cap 213 that seals the opening 2121 of the case 212 of the housing 21, a battery cell 20 employing such a structure facilitates the installation of the check valve 23 on the end cap 213, which is advantageous in reducing the difficulty of assembly in the battery cell 20 and improving the production efficiency of the battery cell 20. Similarly, by installing the wall portion 211 of the housing 21 onto one wall of the case 212, a battery cell 20 employing such a structure reduces the impact of stress generated during the interconnection of the end cap 213 and the case 212 on the check valve 23, which can mitigate phenomena such as damage to the check valve 23, and further improve the operational stability and service life of the battery cell 20.

[0498] According to some embodiments of this application, referring to Figures 3 and 4, the battery cell 20 further includes a pressure relief mechanism 25 installed in the housing 21, the pressure relief mechanism 25 being configured to operate in the event of thermal runaway of the battery cell 20 to release the pressure inside the battery cell 20, the operating pressure of the pressure relief mechanism 25 being greater than the opening pressure of the check valve 23.

[0499] Here, the pressure relief mechanism 25 is installed on the housing 21, may be installed on the end cap 213, or may be installed on the case 212. For example, in Figure 4, the pressure relief mechanism 25 is installed on the end cap 213.

[0500] The pressure release mechanism 25 is configured to operate when the battery cell 20 experiences thermal runaway and release the pressure inside the battery cell 20. In other words, if thermal runaway occurs inside the battery cell 20, the pressure release mechanism 25 operates and opens up, allowing gases and other substances caused by the thermal runaway inside the battery cell 20 to escape.

[0501] The operating pressure of the pressure relief mechanism 25 is greater than the opening pressure of the check valve 23; that is, the pressure at which the gas inside the housing 21 opens the pressure relief mechanism 25 is greater than the pressure at which the gas inside the housing 21 opens the check valve 23. It should be explained that if thermal runaway occurs in the battery cell 20, the gas inside the housing 21 of the battery cell 20 rapidly increases, enabling the pressure relief mechanism 25 to open and release the pressure. However, during normal use, the battery cell 20 can open the check valve 23 when the gas generated inside the housing 21 reaches a threshold, but it cannot open the pressure relief mechanism 25.

[0502] Selectively, the pressure relief mechanism 25 may be integrally molded with the housing 21, or it may be a separate component. If the pressure relief mechanism 25 is integrally molded with the housing 21, it is located in an area on the housing 21 where a fragile structure is installed, for example, an area on the housing 21 where a groove is installed. If the pressure relief mechanism 25 is a separate component from the housing 21, it may be connected to the housing 21 by methods such as welding, heat fusion, injection molding, or bonding. Exemplarily, in Figure 4, the pressure relief mechanism 25 and the housing 21 are separate components, and the pressure relief mechanism 25 is installed on the end cap 213 of the housing 21. The pressure relief mechanism 25 may be a pressure relief member such as an explosion-proof valve, explosion-proof plate, pressure relief valve, or safety valve.

[0503] For example, in Figure 4, both the electrode terminals 24 and the pressure relief mechanism 25 are installed on the end cap 213. A battery cell 20 employing such a structure can save space occupied by the battery cell 20. Of course, in other embodiments, the electrode terminals 24 and the pressure relief mechanism 25 may be installed on different walls of the housing 21. A battery cell 20 employing such a structure can reduce the risk of use of the battery cell 20 by separating the electrode terminals 24, which output or input electrical energy from the battery cell 20, from the pressure relief mechanism 25, which releases internal pressure. For example, the pressure relief mechanism 25 is installed on the case 212, and the electrode terminals 24 are installed on the end cap 213.

[0504] By setting the check valve 23 to release exhaust at a pressure lower than the operating pressure at which the pressure relief mechanism 25 releases pressure, when gas is generated inside the housing 21 during normal use of the battery cell 20, it is possible to discharge it to the outside of the housing 21 via the check valve 23, mitigating the phenomenon of the pressure relief mechanism 25 activating prematurely and releasing pressure before the battery cell 20 experiences thermal runaway due to the rise in internal pressure. Furthermore, this effectively improves the operational stability of the battery cell 20, thereby improving its service life and reliability.

[0505] In some embodiments, the check valve 23 and the pressure relief mechanism 25 may be mounted on the same wall of the housing 21. For example, both the check valve 23 and the pressure relief mechanism 25 are mounted on the end cap 213. A battery cell 20 employing such a structure is advantageous in saving space occupied by the battery cell 20 and improves the energy density of the battery cell 20.

[0506] In some embodiments, the check valve 23 and the pressure relief mechanism 25 may be mounted on different walls of the housing 21. For example, the check valve 23 may be mounted on the end cap 213, and the pressure relief mechanism 25 may be mounted on the case 212. A battery cell 20 employing such a structure can reduce the mutual influence between the check valve 23 and the pressure relief mechanism 25 and can be applied to different operating environments.

[0507] In some embodiments, the exhaust rate of the check valve 23 is smaller than the exhaust rate of the pressure relief mechanism 25.

[0508] By setting the exhaust rate of the check valve 23 to be smaller than the exhaust rate of the pressure relief mechanism 25, it is possible to mitigate the phenomenon in which the pressure relief mechanism 25 cannot be activated and released due to the exhaust of the check valve 23 being too fast when thermal runaway occurs in the battery cell 20. As a result, the pressure relief mechanism 25 can be activated when thermal runaway occurs in the battery cell 20, and the internal pressure of the battery cell 20 can be stably released, which is advantageous in reducing the risk of the battery cell 20 igniting or exploding when thermal runaway occurs.

[0509] Referring to some embodiments of this application, specifically Figure 4, and further to Figure 28, Figure 28 is a schematic diagram of the local structure of a battery cell according to some embodiments of this application. Along the thickness direction X of the wall, the wall 211 has a second surface 2114 facing the electrode assembly 22, and the check valve 23 protrudes from the second surface 2114. The battery cell 20 further includes electrode terminals 24 and a current collector 31, the electrode terminals 24 being attached to the wall 211 and used to output or input electrical energy to the battery cell 20, the current collector 31 being connected to the electrode terminals 24 and the electrode assembly 22, and at least a portion of the current collector 31 being positioned between the wall 211 and the electrode assembly 22. The current collector 31 is provided with a retraction groove 311 that extends into the retraction groove 311 along the thickness direction X of the wall of the check valve 23.

[0510] Here, the electrode terminal 24 is mounted on the wall portion 211 and is electrically connected to the tab 221 of the electrode assembly 22 to realize the input or output of electrical energy to the battery cell 20.

[0511] The current collector component 31 is installed inside the housing 21 and acts as a tab 221 that connects to the electrode terminal 24 and the electrode assembly 22, thereby realizing an electrical connection between the electrode terminal 24 and the electrode assembly 22. The material of the current collector component 31 can vary, for example, copper, iron, steel, or aluminum.

[0512] For example, the battery cell 20 is provided with two electrode terminals 24, both of which are mounted on a wall portion 211, and the two electrode terminals 24 are electrically connected to two tabs 221 of opposite polarity to the electrode assembly 22, respectively, and are used to output or input the positive and negative electrodes of the battery cell 20.

[0513] A retraction groove 311 is provided in the current collector component 31, extending into the retraction groove 311 along the thickness direction X of the wall portion of the check valve 23. In other words, a retraction groove 311 is provided at the position of the current collector component 31 corresponding to the check valve 23, thereby allowing the portion of the check valve 23 that protrudes from the second surface 2114 along the thickness direction X of the wall portion of the check valve 23 to be accommodated within the retraction groove 311.

[0514] The battery cell 20 is further equipped with electrode terminals 24 for inputting or outputting electrical energy from the battery cell 20, and the current collector 31 is connected to the electrode assembly 22 and the electrode terminals 24, so that the current collector 31 can reduce the difficulty of connecting the electrode assembly 22 and the electrode terminals 24. Furthermore, by providing a retraction groove 311 in the current collector 31 and having the check valve 23 extend into the retraction groove 311 in the thickness direction X of the wall, the retraction groove 311 enables the check valve 23 to be retracted by the current collector 31, thereby reducing the effects of interference between the current collector 31 and the check valve 23, while saving the space occupied inside the housing 21 for the check valve 23 and the current collector 31, which is advantageous for improving the energy density of the battery cell 20.

[0515] In some embodiments, the battery cell 20 is an alkaline metal battery, and may be, for example, a sodium metal battery, a lithium metal battery, or the like. By using an alkaline metal battery in combination with a check valve 23, the gas generated when the alkaline metal battery is operating normally can be discharged in a timely manner, thereby improving the service life of the alkaline metal battery.

[0516] According to some embodiments of this application, the application further provides a battery 100 which comprises a battery cell 20 of any one of the above-described solutions.

[0517] Referring to Figure 2, the battery 100 may further include a housing 10, and the battery cells 20 are housed within the housing 10. In some embodiments, the housing 10 may include a first box body 11 and a second box body 12, the first box body 11 and the second box body 12 overlapping each other, and the first box body 11 and the second box body 12 together define an assembly space for housing the battery cells 20.

[0518] Selectively, in Figure 2, the second box body 12 may be a hollow structure with one end open, and the first box body 11 may be a plate-like structure, and the first box body 11 is placed over the open side of the second box body 12, thereby limiting the assembly space for both the first box body 11 and the second box body 12. Of course, the structure of the housing 10 is not limited to this, and in other embodiments, both the first box body 11 and the second box body 12 may be hollow structures with one side open, and the open side of the first box body 11 is placed over the open side of the second box body 12.

[0519] Of course, the housing 10 formed by the first box body 11 and the second box body 12 may have various shapes, such as a cylinder or a rectangular parallelepiped. For example, in Figure 2, the housing 10 has a rectangular parallelepiped structure.

[0520] In some embodiments, the battery cell 20 installed in the housing 10 may be one or multiple. For example, in Figure 2, multiple battery cells 20 are installed in the housing 10 of the battery 100, and the multiple battery cells 20 may be connected in series, in parallel, or in series-parallel. Series-parallel connection means that the multiple battery cells 20 have both series and parallel connections. The multiple battery cells 20 may be directly connected in series, in parallel, or in series-parallel, and the entire assembly composed of multiple battery cells 20 may be housed in the housing 10. Of course, the battery 100 may first have multiple battery cells 20 connected in series, in parallel, or in series-parallel to form a battery module, and then the multiple battery modules may be connected in series, in parallel, or in series-parallel to form an integrated unit, which may then be housed in the housing 10.

[0521] Here, the battery 100 may further include other structures, for example, the battery 100 may further include a busbar member, the busbar member being connected to a plurality of battery cells 20 to realize electrical connections between the plurality of battery cells 20.

[0522] It should be explained that in some embodiments, the battery 100 does not require a housing 10, and the battery 100 includes a plurality of battery cells 20, but the battery 100 composed of a plurality of battery cells 20 can be assembled directly on a power consumption device and the plurality of battery cells 20 can provide electrical energy to the power consumption device. In other words, the housing 10 can be part of the power consumption device. Taking a vehicle 1000 as an example, the power consumption device can be part of the chassis structure of the vehicle 1000, for example, a portion of the housing 10 may be at least part of the floor of the vehicle 1000, or a portion of the housing 10 may be at least part of the cross member and side member of the vehicle 1000.

[0523] According to some embodiments of this application, the application further provides a power consumption device comprising a battery cell 20 of any one of the above-described solutions, wherein the battery cell 20 is used to provide electrical energy to the power consumption device.

[0524] Here, the power consumption device may be any one of the devices or systems that utilize the aforementioned battery cell 20.

[0525] According to some embodiments of this application, with reference to Figures 3 to 8, 16 to 17, 20 to 22, and 25 to 27, this application provides a battery cell 20 which includes a housing 21, an electrode assembly 22, a check valve 23, an insulating member 26, a shielding material 27, a protective sheet 29, and a pressure relief mechanism 25. The housing 21 has a wall portion 211 and includes a case 212 and an end cap 213, the case 212 having an enclosure cavity with an opening 2121, the electrode assembly 22 is housed in the enclosure cavity, the end cap 213 seals the opening 2121, and the end cap 213 is the wall portion 211. Along the thickness direction X of the wall portion, the wall portion 211 has a first surface 2112 that is away from the electrode assembly 22 and a second surface 2114 that faces the electrode assembly 22. A mounting groove 2113 is provided on the first surface 2112, and a mounting hole 2111 is provided on the bottom surface of the mounting groove 2113. A check valve 23 is mounted in the mounting hole 2111 and protrudes from the second surface 2114, and the check valve 23 is used to discharge gas from inside the housing 21. The check valve 23 includes a valve body 231 and a valve core 232, the valve body 231 includes a valve body 2314 and a valve cover 2315, the valve body 2314 is installed in a mounting hole 2111 and protrudes from a second surface 2114, an intake port 2312 is provided at the end of the valve body 2314 closer to the electrode assembly 22 in the thickness direction X of the wall, the valve cover 2315 is connected to the end of the valve body 2314 away from the electrode assembly 22 along the thickness direction X of the wall, an exhaust port 2313 is provided on the valve cover 2315, the valve cover 2315 and the valve body 2314 together enclose the mounting cavity 2311, the intake port 2312 communicates with the mounting cavity 2311 and the inside of the housing 21, and the exhaust port 2313 communicates with the mounting cavity 2311 and the outside of the housing 21.At the end of the valve body 2314 that separates from the electrode assembly 22, a sunk groove 2314a is provided. The valve cover 2315 is accommodated in the sunk groove 2314a and does not protrude beyond the end of the valve cover 2315 that separates from the electrode assembly 22 of the valve body 2314. The valve core 232 includes an elastic member 2321 and a sealing member 2322. The elastic member 2321 is a spring, and the sealing member 2322 is installed movably between the valve cover 2315 and the cavity bottom surface of the mounting cavity 2311 along the thickness direction X of the wall portion. Both ends of the elastic member 2321 in the thickness direction X of the wall portion are respectively in contact with the sealing member 2322 and the valve cover 2315. The sealing member 2322 is used to seal the intake port 2312 under the action of the elastic member 2321 and is also used to open the intake port 2312 under the action of the gas inside the housing 21. On the side of the valve cover 2315 facing the sealing member 2322, a first guide post 2315b protrudes. The portion of the elastic member 2321 is externally fitted outside the first guide post 2315b. The diameter of the first guide post 2315b is D1, the inner diameter of the elastic member 2321 is D2, and 0mm < D2 - D1 ≤ 5mm is satisfied. The sealing member 2322 includes a pressing portion 2322a and a sealing portion 2322b. Along the thickness direction X of the wall portion, both ends of the elastic member 2321 are respectively in contact with the valve cover 2315 and the pressing portion 2322a. The sealing portion 2322b is connected to the side of the pressing portion 2322a that separates from the valve cover 2315. The sealing portion 2322b is used to seal the intake port 2312. On the side of the pressing portion 2322a facing the valve cover 2315, a second guide post 2322c protrudes. The portion of the elastic member 2321 is externally fitted outside the second guide post 2322c. The diameter of the second guide post 2322c is D3, the inner diameter of the elastic member 2321 is D2, and 0mm < D3 - D2 ≤ 5mm is satisfied. The pressing portion 2322a has a first contact surface 2322f facing the sealing portion 2322b, the sealing portion 2322b has a second contact surface 2322g facing the pressing portion 2322a, a locking groove 2322h is provided on the first contact surface 2322f, and a locking portion 2322k that engages and fits with the locking groove 2322h protrudes on the second contact surface 2322g.Along the thickness direction X of the wall portion, the distance between the first guide post 2315b and the second guide post 2322c is L, satisfying 0 mm < L ≤ 2 mm. The mounting hole 2111 includes a first hole portion 2111b and a second hole portion 2111c. The first hole portion 2111b and the second hole portion 2111c are arranged along the thickness direction X of the wall portion. The first hole portion 2111b is located on the side away from the electrode assembly 22 of the second hole portion 2111c, and the hole diameter of the first hole portion 2111b is larger than the hole diameter of the second hole portion 2111c. The hole wall surface of the first hole portion 2111b is the first connection surface 2111a. The valve body 231 has a connection portion 2314c located within the first hole portion 2111b. The outer peripheral surface of the connection portion 2314c is the second connection surface 2314b. Both the first connection surface 2111a and the second connection surface 2314b are installed around the central axis of the mounting hole 2111, and the first connection surface 2111a is welded to the second connection surface 2314b. The first connection surface 2111a coincides with the second connection surface 2314b, and both the first connection surface 2111a and the second connection surface 2314b are installed at an acute angle to the central axis of the mounting hole 2111. The insulating member 26 includes a main body portion 261 and a housing portion 262. The main body portion 261 is installed on the side facing the electrode assembly 22 of the wall portion 211. The housing portion 262 is connected to the main body portion 261, and the portion extending to the inside of the housing 21 of the check valve 23 is housed within the housing portion 262. The housing portion 262 includes a first wall 2622 and a second wall 2623. The first wall 2622 is installed surrounding 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 portion 261, and the second wall 2623 is connected to the end of the first wall 2622 away from the main body portion 261. A second through hole 2621 is installed on the second wall 2623, and the second through hole 2621 communicates with the inside of the intake port 2312 housing 21. The shielding material 27 is installed within the mounting groove 2113 of the wall portion 211, abuts against the groove bottom surface of the mounting groove 2113, and is located on the side away from the electrode assembly 22 of the check valve 23 along the thickness direction X of the wall portion. The shielding material 27 covers the check valve 23, and an exhaust passage 28 is formed between the shielding material 27 and the wall portion 211. The exhaust passage 28 communicates the exhaust port 2313 with the outside 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 being formed between the shielding material 27 and the groove side of the mounting groove 2113. The cross-section of the shielding material 27 and the wall portion of the mounting groove 2113 perpendicular to the thickness direction X is rectangular, the outer surface of the shielding material 27 includes four first corner surfaces 271 and four first side surfaces 272, with each pair of adjacent first side surfaces 272 connected by one 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 one second corner surface 2113a, each first side surface 272 abuts against and is welded to the corresponding second side surface 2113b, forming a third exhaust gap 281 between each first corner surface 271 and the corresponding second corner surface 2113a. The first corner surface 271 and the second corner surface 2113a are both arcuate surfaces, and the radius of the first corner surface 271 is greater than the radius of the second corner surface 2113a. Along the thickness direction X of the wall, the shielding material 27 has a third surface 275 facing the check valve 23 and a fourth surface 276 away from the check valve 23. The third surface 275 laps over the bottom surface of the mounting groove 2113, and the fourth surface 276 is flush with the first surface 2112. Four first grooves 2751 are provided on the third surface 275. The first grooves 2751 extend along the radial direction of the shielding material 27, penetrate one of the first corner surfaces 271, and form a fourth exhaust gap 282 between the bottom surface of the first grooves 2751 and the bottom surface of the mounting groove 2113. A second groove 2752 is further provided on the third surface 275, and a plurality of first grooves 2751 are provided around the second groove 2752, all communicating with the second groove 2752, which communicates with the exhaust port 2313. Along the thickness direction X of the wall, the exhaust port 2313 is provided facing the second groove 2752, and the projection of the exhaust port 2313 is located within the second groove 2752. A protective sheet 29 is provided on the side of the wall 211 away from the electrode assembly 22, and an information collection hole 291 is provided on the protective sheet 29 that penetrates the protective sheet 29, and the projection of the information collection hole 291 in the thickness direction X of the wall is located within the shielding material 27.An exhaust port 283 communicating with the outside of the housing 21 is formed at one end of the exhaust passage 28, and the protective sheet 29 covers the exhaust port 283 along the thickness direction X of the wall. An adhesive layer 30 is installed on the side of the protective sheet 29 facing the wall 211 to bond the protective sheet 29 to the wall 211, and a first retraction hole 301 is installed at a position corresponding to the information collection hole 291 of the adhesive layer 30, and along the thickness direction X of the wall, both the mounting groove 2113 and the projection of the shielding material 27 are located within the first retraction hole 301. The pressure relief mechanism 25 is installed on the wall 211 and is configured to operate when the battery cell 20 experiences thermal runaway to release the pressure inside the battery cell 20, the operating pressure of the pressure relief mechanism 25 is greater than the opening pressure of the check valve 23, and the exhaust rate of the check valve 23 is less than the exhaust rate of the pressure relief mechanism 25.

[0526] It should be noted that, as long as they do not conflict, the embodiments and features in this application can be combined with each other.

[0527] The foregoing are merely preferred embodiments of this application and are not intended to limit it. To those skilled in the art, this application is subject to various modifications and changes. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection. [Explanation of symbols]

[0528] 1000-Vehicle, 100-Battery, 10-Housing, 11-First Box Body, 12-Second Box Body, 20-Battery Cell, 21-Housing, 211-Wall, 2111-Mounting Hole, 2111a-First Connection Surface, 2111b-First Hole Section, 2111c-Second Hole Section, 2112-First Surface, 2113-Mounting Groove, 2113a-Second Corner Surface, 2113b-Second Side, 2114-Second Surface, 212-Case, 2121-Opening, 213-End Cap, 22-Electrode Assembly, 221-Tab, 23-Check valve, 231-Valve body, 2311-Mounting cavity, 2312-Intake port, 2313-Exhaust port, 2314-Valve body, 2314a-Sunk groove, 2314b-Second connection surface, 2314c-Connection part, 2314d-First stress release groove, 2315-Valve cover, 2315a-Protrusion, 2315b-First guide post, 2315c-First stopper groove, 232-Valve core, 2321-Elastic member, 2322-Sealing member, 2322a-Pressing part, 2322b-Seal part, 232 2c - Second guide post, 2322d - Second stopper groove, 2322e - Stopper projection, 2322f - First contact surface, 2322g - Second contact surface, 2322h - Locking groove, 2322k - Locking part, 24 - Electrode terminal, 25 - Pressure release mechanism, 26 - Insulating member, 261 - Main body, 2611 - Assembly hole, 2612 - Housing groove, 262 - Housing part, 2621 - Second through hole, 2622 - First wall, 2623 - Second wall, 2624 - Burring part, 27 - Shielding material, 271 - First corner Surface, 272 - First side surface, 273 - Second groove, 274 - Contact area, 275 - Third surface, 2751 - First groove, 2752 - Second groove, 276 - Fourth surface, 28 - Exhaust passage, 281 - Third exhaust gap, 282 - Fourth exhaust gap, 283 - Exhaust port, 29 - Protective sheet, 291 - Information collection hole, 292 - Second retraction hole, 293 - Third retraction hole, 30 - Adhesive layer, 301 - First retraction hole, 31 - Current collector component, 311 - Retraction groove, 200 - Controller, 300 - Motor, X - Thickness direction of the wall.

Claims

1. It is a battery cell, A housing having a wall section, An electrode assembly housed within the housing, A battery cell, comprising a check valve installed in the wall portion for discharging gas from inside the housing.

2. The aforementioned check valve is A valve body installed in the wall portion, wherein a mounting cavity is formed inside the valve body, and an intake port and an exhaust port are provided on the valve body, the intake port is used to communicate between the mounting cavity and the inside of the housing, and the exhaust port is used to communicate between the mounting cavity and the outside of the housing. The battery cell according to claim 1, further comprising a valve core installed in the mounting cavity, which is used to seal the intake port and to open the intake port under the action of gas inside the housing.

3. The valve body is, A valve body installed on the wall portion and on which the air intake port is installed, The battery cell according to claim 2, comprising a valve cover installed along the thickness direction of the wall portion at the end of the valve body away from the electrode assembly, and together with the valve body, surrounding the mounting cavity.

4. The battery cell according to claim 3, wherein the valve cover is connected to the valve body, and the exhaust port is a first through-hole installed 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 exhaust port is a first exhaust gap formed between the valve cover and the valve body.

6. The battery cell according to claim 3, wherein the valve cover is connected to the valve body, and a recessed groove is provided at the end of the valve body away from the electrode assembly, and at least a portion of the valve cover is housed in the recessed groove.

7. The battery cell according to claim 6, wherein the valve cover does not protrude beyond the end of the valve body that is separated from the electrode assembly along the thickness direction of the wall portion.

8. The battery cell according to claim 7, wherein, along the thickness direction of the wall portion, the wall portion has a first surface that moves away from the electrode assembly, and the valve body does not protrude beyond the first surface.

9. The battery cell according to claim 3, wherein the valve cover is connected to the wall portion, and the exhaust port is a second exhaust gap formed between the valve cover and the wall portion.

10. The battery cell according to claim 3, wherein the valve body is integrally molded with the wall portion.

11. The valve core is An elastic member installed within the aforementioned mounting cavity, The battery cell according to claim 3, comprising a sealing member movably installed within the mounting cavity, which is used to seal the air intake under the action of the elastic member and to open the air intake under the action of the gas inside the housing.

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 material of the elastic member includes steel, iron, or aluminum.

14. The battery cell according to claim 11, wherein the valve cover is installed at a distance from the sealing member along the thickness direction of the wall portion, both ends of the elastic member abut against the valve cover and the sealing member, respectively, and the air intake is installed on the bottom surface of the mounting cavity.

15. A first guide post is provided on the side of the valve cover facing the sealing member, and the portion of the elastic member is fitted onto the outside of the first guide post, as described in claim 14.

16. The valve cover is connected to the valve body, and the exhaust port is a first through-hole installed on the valve cover. Here, along the thickness direction of the wall portion, the exhaust port penetrates the first guide post, or The battery cell according to claim 15, wherein the exhaust port is arranged at a distance from the first guide post along the radial direction of the first guide post.

17. The diameter of the first guide post is D １ The inner diameter of the elastic member is D ２ Therefore, 0 mm < D ２ -D １ A battery cell according to claim 15 or 16, satisfying ≤ 5 mm.

18. A first stopper groove is provided on the side of the valve cover facing the sealing member, and the end of the elastic member away from the sealing member is inserted into the first stopper groove, as described in claim 14.

19. The battery cell according to claim 14, wherein the end of the elastic member that is separated from the sealing member is fixedly connected to the valve cover.

20. A second guide post is provided on the side of the sealing member facing the valve cover, and the portion of the elastic member is fitted onto the outside of the second guide post, as described in claim 14.

21. The diameter of the second guide post is D ３ The inner diameter of the elastic member is D ２ Therefore, 0 mm < D ３ -D ２ A battery cell according to claim 20, satisfying ≤ 5 mm.

22. A second stopper groove is provided on the side of the sealing member facing the valve cover, and the end of the elastic member away from the valve cover is inserted into the second stopper groove, as described in claim 14.

23. The battery cell according to claim 14, wherein the end of the elastic member that is separated from the valve cover is fixedly connected to the sealing member.

24. The battery cell according to claim 14, wherein the sealing member is installed at a distance from the side surface of the mounting cavity.

25. The battery cell according to claim 14, wherein a plurality of stopper protrusions are provided on the outer circumferential surface of the sealing member, the plurality of stopper protrusions are arranged at intervals along the circumferential direction of the sealing member, and the stopper protrusions are guided and fitted with the cavity side surface of the mounting cavity.

26. The battery cell according to claim 14, wherein the sealing member includes a pressing portion and a sealing portion, and both ends of the elastic member abut against the valve cover and the pressing portion, respectively, along the thickness direction of the wall 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 intake port.

27. The battery cell according to claim 26, wherein the pressing portion has a first contact surface facing the sealing portion, the sealing portion has a second contact surface facing the pressing portion, a locking groove is provided on one of the first contact surface and the second contact surface, and a locking portion is provided on the other, and the locking portion engages with the locking groove and is fitted.

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

29. The battery cell according to claim 26, wherein the material of the sealing portion includes ethylene propylene rubber, fluororubber, or Teflon.

30. The battery cell according to claim 14, wherein the size of the gap between the valve cover and the sealing member along the thickness direction of the wall portion is L, satisfying 0 mm < L ≤ 2 mm.

31. The battery cell according to claim 3, wherein the valve body is welded to the wall portion.

32. The battery cell according to claim 31, wherein a mounting hole is provided in the wall portion, at least a portion of the valve body is housed in the mounting hole, the wall surface of the mounting hole includes a first connecting surface, the valve body includes a second connecting surface, both the first connecting surface and the second connecting surface are positioned 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 connection surface coincides with the second connection surface, and both the first and second connection surfaces are installed at an acute angle with the central axis of the mounting hole.

34. The mounting hole includes a first hole portion and a second hole portion, the first hole portion and the second hole portion are arranged along the thickness direction of the wall portion, and the first hole portion is located on the side of the second hole portion away from the electrode assembly, and the hole diameter of the first hole portion is larger than the hole diameter of the second hole portion. The battery cell according to claim 33, wherein the hole wall surface of the first hole portion is the first connection surface, the valve body has a connection portion located within the first hole portion, and the outer circumferential surface of the connection portion is the second connection surface.

35. The battery cell according to claim 32, wherein, along the thickness direction of the wall portion, the end face of the end of the valve body away from the electrode assembly connects to the second connecting surface, and a first stress release groove is provided on the end face of the end of the valve body away from the electrode assembly.

36. The battery cell according to claim 35, wherein the first stress-relieving groove is installed around the central axis of the mounting hole.

37. The aforementioned battery cell is The invention further includes an insulating member installed on the side of the wall portion facing the electrode assembly, The battery cell according to claim 1, wherein, along the thickness direction of the wall portion, the wall portion has a second surface facing the electrode assembly, the check valve protrudes from the second surface, the insulating member includes a main body portion and a housing portion, the main body portion is installed on the side of the wall portion facing the electrode assembly, the housing portion is connected to the main body portion, and the portion of the check valve extending into the housing is housed in the housing portion.

38. The check valve includes a valve body, and along the thickness direction of the wall portion, the valve body protrudes from the second surface, and an air intake port is provided in the portion of the valve body protruding from the second surface, and the air intake port is configured to discharge gas from inside the housing. The battery cell according to claim 37, wherein the housing portion is provided with a second through-hole communicating with the air intake.

39. Along the thickness direction of the wall portion, the intake port is installed at the end of the valve body facing the electrode assembly. The housing includes a first wall and a second wall, the first wall being installed surrounding the valve body, one end of the first wall being connected to the main body along the thickness direction of the wall, and the second wall being connected to the end of the first wall away from the main body. The battery cell according to claim 38, wherein the second through-hole is installed in the first wall and / or the second wall.

40. The battery cell according to claim 39, wherein the housing portion is integrally molded with the main body portion.

41. The battery cell according to claim 39, wherein the housing is installed separately from the main body.

42. The aforementioned housing section is The battery cell according to claim 41, further comprising a burring portion connected to the end of the first wall away from the second wall, wherein at least a portion of the burring portion is installed stacked with the main body, and the burring portion abuts against the side of the main body facing the wall.

43. The battery cell according to claim 42, wherein a housing groove is provided on the surface of the main body facing the wall along the thickness direction of the wall, and the burring portion is housed in the housing groove.

44. The battery cell according to claim 43, wherein, along the thickness direction of the wall portion, the surface of the burring portion facing the wall portion is flush with the surface of the main body portion facing the wall portion.

45. The aforementioned battery cell is The present invention further includes a shielding material attached to the wall portion, wherein, along the thickness direction of the wall portion, the shielding material is positioned on the side away from the electrode assembly of the check valve, and the shielding material covers the check valve. The battery cell according to claim 1, wherein the check valve has an exhaust port for discharging gas from inside the housing, an exhaust passage is formed between the shielding material and the wall, or the exhaust passage is installed on the shielding material, and the exhaust passage connects the exhaust port to the outside of the housing.

46. The battery cell according to claim 45, wherein, along the thickness direction of the wall portion, the wall portion has a first surface that moves away from the electrode assembly, a mounting groove is provided on the first surface, a mounting hole is provided on the bottom surface of the mounting groove, at least a portion of the check valve is installed in the mounting hole, and at least a portion of the shielding material is housed in the mounting groove.

47. The battery cell according to claim 46, wherein the exhaust passage includes a third exhaust gap, the third exhaust gap is formed between the shielding material and the groove side of the mounting groove, and the third exhaust gap is used to communicate the exhaust port with the outside of the housing.

48. The outer circumferential surface of the shielding material includes a first corner surface and at least two first side surfaces, the first corner surface being connected to two adjacent first side surfaces, The battery cell according to claim 47, wherein the groove side surface of the mounting groove includes a second corner surface and at least two second side surfaces, the second corner surface being connected to two adjacent second side surfaces, each second side surface being 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 both the first corner surface and the second corner surface are arcuate 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 claim 48, wherein the cross section of the shielding material perpendicular to the thickness direction of the wall portion is rectangular, the outer surface of the shielding material includes four first side surfaces and four first corner surfaces, and the third exhaust gap is formed in at least one of the first corner surfaces.

52. The battery cell according to claim 47, wherein the exhaust passage further includes a fourth exhaust gap, the fourth exhaust gap is formed between the shielding material and the bottom surface of the mounting groove, and the fourth exhaust gap communicates with the third exhaust gap and the exhaust port.

53. The battery cell according to claim 52, wherein the shielding material has a third surface facing the check valve along the thickness direction of the wall portion, the third surface overlaps the groove bottom surface of the mounting groove, a first groove is provided on the third surface, and the fourth exhaust gap is formed between the groove bottom surface of the first groove and the groove bottom surface of the mounting groove.

54. A battery cell according to claim 53, wherein a plurality of third exhaust gaps are formed between the shielding material and the groove side surface of the mounting groove, the plurality of third exhaust gaps are arranged at intervals along the circumferential direction of the shielding material, a plurality of first grooves are provided on the third surface, and each of the third exhaust gaps communicates with one of the first grooves.

55. The battery cell according to claim 54, wherein a second groove is further provided on the third surface, a plurality of the first grooves are provided around the second groove and all communicate with the second groove, and the second groove communicates with the exhaust port.

56. The battery cell according to claim 55, wherein, along the thickness direction of the wall portion, the exhaust port is installed at the end of the check valve away from the electrode assembly, the exhaust port is installed facing the second groove, and the projection of the exhaust port is located within the second groove.

57. The battery cell according to claim 46, wherein the shielding material does not protrude beyond the first surface along the thickness direction of the wall portion.

58. The battery cell according to claim 57, wherein the shielding material has a fourth surface that is away from the check valve, and the fourth surface is flush with the first surface.

59. The battery cell according to claim 45, wherein the shielding material is fixedly connected to the wall portion.

60. The aforementioned battery cell is The battery cell according to claim 45, further comprising a protective sheet installed on the side of the wall portion away from the electrode assembly, wherein an information collection hole is provided on the protective sheet and penetrates the protective sheet, and the projection of the information collection hole in the thickness direction of the wall portion is located within the shielding material.

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 passage, and the protective sheet covers the exhaust port.

62. An adhesive layer is provided on the side of the protective sheet facing the wall portion to bond the protective sheet to the wall portion. The battery cell according to claim 61, wherein a first retraction hole is provided at a position corresponding to the information collection hole in the adhesive layer, 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 retraction hole.

63. An exhaust port is formed at one end of the exhaust passage, which communicates with the outside of the housing. The battery cell according to claim 45, further comprising a protective sheet, the protective sheet being installed on the side of the wall away from the electrode assembly, and the protective sheet covering the exhaust port.

64. The battery cell according to claim 1, wherein a mounting hole is provided in the wall portion, and at least a portion of the check valve is mounted in the mounting hole, which is the liquid injection hole of the battery cell.

65. The aforementioned housing is A case having an internally formed housing cavity, wherein the housing cavity is used to house the electrode assembly, Includes an end cap that seals the opening, Here, the end cap is the wall portion, or The case includes the wall portion, as described in claim 1.

66. The aforementioned battery cell is The battery cell according to claim 1, further comprising a pressure relief mechanism installed in the housing, wherein the pressure relief mechanism is configured to operate when the battery cell experiences thermal runaway and to release the pressure inside the battery cell, and the operating pressure of the pressure relief mechanism is greater than the opening pressure of the check valve.

67. The battery cell according to claim 66, wherein the exhaust rate of the check valve is smaller than the exhaust rate of the pressure relief mechanism.

68. Along the thickness direction of the wall portion, the wall portion has a second surface facing the electrode assembly, and the check valve protrudes from the second surface. The battery cell further includes electrode terminals and a current collector, the electrode terminals being mounted on the wall and used to output or input electrical energy from the battery cell, the current collector being connected to the electrode terminals and the electrode assembly, and at least a portion of the current collector being installed between the wall and the electrode assembly. The battery cell according to claim 1, wherein the current collector component is provided with a retraction groove, and the check valve extends into the retraction groove along the thickness direction of the wall portion.

69. A battery comprising the battery cell described in claim 1.

70. A power consumption device comprising a battery cell as described in claim 1, wherein the battery cell is used to provide electrical energy.

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