Battery monomer, battery device and electric device

Abstract

The utility model provides a battery monomer, a battery device and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, an electrode terminal, an electrode assembly, electrolyte and an adsorption part, the electrode terminal is arranged on the shell. The electrode assembly comprises a main body part and a tab arranged at one end of the main body part in a protruding manner, the tab is electrically connected with the electrode terminal, and the negative active material layer of the negative plate of the main body part comprises a simple substance of active metal. The electrolyte is contained in the shell and comprises electrolyte salt and a solvent, and the solvent comprises at least one of an ether solvent and an ester solvent. The adsorption part is arranged in the shell and comprises a hydrogen adsorption material. Through the arrangement of the adsorption part, the adsorption part can adsorb hydrogen generated when the electrode assembly with the elementary substance of the active metal is used in the ether or ester electrolyte, so that the phenomenon that the internal pressure of the battery monomer is sharply increased after the gas is accumulated in the shell is relieved, and the use reliability of the battery monomer is favorably improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more specifically, to a battery cell, a battery device, and an electrical device. Background Technology

[0002] In recent years, new energy vehicles have experienced rapid development. In the field of electric vehicles, power batteries, as the power source, play an irreplaceable and crucial role. With the vigorous promotion of new energy vehicles, the demand for power battery products is also increasing. Battery devices, as core components of new energy vehicles, have high requirements in terms of performance.

[0003] In battery technology, a battery cell typically includes a casing and electrode components and electrolyte housed within the casing. Because the active materials of the electrode components contain elemental active metals, a large amount of gases such as hydrogen are generated inside the battery cell during use. This leads to an increase in the internal gas pressure of the battery cell, making it prone to bulging and deformation during use. It can even cause the casing to fail or leak, which is detrimental to improving the battery cell's lifespan and reliability. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical device, which can effectively improve the service life and reliability of the battery cell.

[0005] In a first aspect, embodiments of this application provide a battery cell, including a casing, electrode terminals, an electrode assembly, an electrolyte, and an adsorbent; the electrode terminals are disposed in the casing; the electrode assembly is housed within the casing, the electrode assembly includes a main body and a tab, the tab protrudes from one end of the main body and is electrically connected to the electrode terminals, the main body includes a negative electrode sheet, the negative electrode sheet includes a negative current collector and a negative active material layer disposed on at least one side of the negative current collector, the negative active material layer includes an elemental active metal; the electrolyte is housed within the casing, the electrolyte includes an electrolyte salt and a solvent, the solvent includes at least one of an ether solvent or an ester solvent; the adsorbent is disposed within the casing, the adsorbent includes a hydrogen adsorption material.

[0006] In the above technical solution, an adsorption element is provided inside the casing of the battery cell, and the adsorption element has a hydrogen adsorption material. This allows the adsorption element to adsorb the hydrogen generated when the electrode assembly with active metals is used in ether or ester electrolytes. This alleviates the phenomenon of a sharp increase in internal pressure of the battery cell caused by the accumulation of gas inside the casing. As a result, it can effectively reduce the occurrence of bulging or deformation of the battery cell during use, thereby reducing the risk of connection failure or leakage of the casing during use. This is conducive to improving the service life and reliability of the battery cell.

[0007] In some embodiments, the housing has a wall portion, and the adsorption member is disposed between the wall portion and the main body portion; wherein, the wall portion includes a first region and a second region, the first region and the second region are both located on the same side of the main body portion in a first direction, and the first region and the second region are arranged along a second direction, the first region having a first surface facing the main body portion along the first direction, the second region having a second surface facing the main body portion, and the second surface being further away from the main body portion than the first surface, the wall portion forming a recessed space on the side of each second region facing the main body portion, at least a portion of the adsorption member being accommodated within the recessed space, and the second direction being perpendicular to the first direction.

[0008] In the above technical solution, the wall of the outer casing has a first region and a second region arranged along the second direction, and the second surface of the second region facing the main body is further away from the main body than the first surface of the first region facing the main body, so that a recessed space is formed on the side of the second region facing the main body. By setting at least a portion of the adsorbent to be accommodated in the recessed space of the wall, the adsorbent can share space with the wall in the first direction and can also adsorb hydrogen generated by the electrode assembly with active metal during the cycle of use, so as to alleviate the phenomenon of the internal pressure of the battery cell increasing sharply after the gas accumulates inside the casing. This can effectively reduce the phenomenon of bulging or deformation of the battery cell during use, thereby reducing the risk of connection failure or leakage of the casing during use. In this way, the energy density of the battery cell can be improved while improving the service life and reliability of the battery cell.

[0009] In some embodiments, along the first direction, the first region has a third surface facing away from the main body, and the second region has a fourth surface facing away from the main body; wherein the fourth surface is further away from the main body than the third surface in the first direction, and the wall portion further includes a connecting region, through which the first region and the second region are connected.

[0010] In the above technical solution, by setting the fourth surface of the second region away from the main body to be further away from the main body than the third surface of the first region away from the main body, the second region and the connecting area of ​​the wall are bulging towards the main body of the electrode assembly. Furthermore, a connecting area is formed between the first region and the second region of the wall. This increases the depth of the recessed space on the side of the wall facing the main body in the second region. On the one hand, it can further increase the space inside the casing for accommodating the gas generated by the battery cell during use, thereby further alleviating the phenomenon of a sharp increase in the internal pressure of the battery cell after the gas accumulates inside the casing. This helps to reduce the occurrence of bulging or deformation of the battery cell during use. On the other hand, it reduces the difficulty of accommodating the adsorption component in the recessed space and further increases the space shared by the adsorption component and the wall, which helps to further improve the energy density of the battery cell.

[0011] In some embodiments, along the first direction, the second surface is further away from the body portion than the third surface.

[0012] In the above technical solution, by setting the second surface of the second region facing the main body to be further away from the main body than the third surface of the first region facing away from the main body, the second region is a structure that is further away from the main body of the electrode assembly in the first direction than the first region. This can further increase the bulge height of the second region of the wall and the connecting area in the first direction, thereby further increasing the recess depth of the recessed space of the wall on the side of the second region facing the main body. On the one hand, it can further increase the space inside the shell for accommodating the gas generated by the battery cell during use, thereby further alleviating the phenomenon of a sharp increase in the internal pressure of the battery cell after the gas accumulates inside the shell. On the other hand, it can further reduce the difficulty of accommodating the adsorbent in the recessed space, and further increase the space shared by the adsorbent and the wall, which is conducive to further improving the energy density of the battery cell.

[0013] In some embodiments, the electrode terminal is disposed in the first region, and in the first direction, the electrode terminal protrudes from the third surface in a direction from the first surface toward the third surface.

[0014] In the above technical solution, by setting the electrode terminals on the first region and making the electrode terminals protrude from the third surface, the second region of the wall without electrode terminals and the connection region are structures that protrude in the direction away from the main body of the electrode assembly, so that the second region of the wall and the connection region can share space with the electrode terminals in the first direction. Thus, the battery cell with this structure can transfer the space on the outside of the wall and the side of the electrode terminals to the inside of the casing without excessively increasing the overall size of the battery cell in the first direction. In this way, the space on the outside of the wall can be effectively utilized to increase the space inside the casing for accommodating the gas generated by the battery cell during use.

[0015] In some embodiments, in the first direction, the electrode terminal protrudes from the fourth surface in the direction from the first surface to the third surface.

[0016] In the above technical solution, by setting the electrode terminal to protrude from the fourth surface in the direction from the first surface to the third surface, the second region and the connecting region of the wall portion are structures that do not extend beyond the end of the electrode terminal away from the main body in the first direction. This achieves two advantages: firstly, it enables the transfer of space on the outside of the wall portion and on the side of the electrode terminal to the housing, thereby increasing the space inside the housing for accommodating the gas generated by the battery cell during use, without increasing the overall size of the battery cell in the first direction; secondly, it facilitates the assembly and connection of the electrode terminal with other components during the subsequent assembly of the battery cell, which helps to reduce the interference effect of the second region and the connecting region of the wall portion on the assembly of the electrode terminal.

[0017] In some embodiments, the wall portion includes two first regions and three second regions, the first regions and the second regions being arranged alternately along the second direction, and the battery cell including two electrode terminals with opposite polarities, one electrode terminal being disposed in one first region and the other electrode terminal being disposed in the other first region; wherein, along the first direction, the fourth surface of the second region located between the two electrode terminals is further away from the body portion than the fourth surfaces of the second regions located on both sides of the two electrode terminals.

[0018] In the above technical solution, by setting the fourth surface of the two second regions located at both ends of the wall in the first direction to be further away from the main body than the fourth surface of the second region located between the two electrode terminals, the wall is a structure with a lower bulge height at both ends in the first direction. This facilitates the formation of multiple second regions on the wall, reducing the processing difficulty of the wall. On the other hand, it facilitates the connection of structures such as pressure strips on the two second regions on both sides of the two electrode terminals of the wall during the subsequent assembly of battery cells, reducing the difficulty of subsequent assembly of battery cells. Furthermore, it enables the pressure strips and other structures to share space with the wall in the first direction, which helps to optimize the spatial layout of battery cells during subsequent assembly.

[0019] In some embodiments, along the first direction, the maximum distance between the first surface and the second surface is L, satisfying 1.5mm≤L≤10mm.

[0020] In the above technical solution, by setting the maximum distance between the first surface of the first region and the second surface of the second region to 1.5mm to 10mm, the recess depth of the wall portion on the side of the second region facing the main body is 1.5mm to 10mm. On the one hand, setting the recess depth of the recessed space to be greater than or equal to 1.5mm can increase the space inside the shell for accommodating the gas generated by the battery cell during use, thereby alleviating the phenomenon of a sharp increase in the internal pressure of the battery cell caused by the accumulation of gas inside the shell. It also facilitates the recessed space to accommodate the adsorption component, which helps to reduce the assembly difficulty of the adsorption component. On the other hand, setting the recess depth of the recessed space to be less than or equal to 10mm can reduce the molding difficulty of the wall portion and effectively alleviate the phenomenon that the wall portion occupies too much space in the first direction due to the excessive depth of the wall portion, thereby optimizing the overall size of the battery cell.

[0021] In some embodiments, 2.5mm ≤ L ≤ 6mm.

[0022] In the above technical solution, by further setting the maximum distance between the first surface of the first region and the second surface of the second region to 2.5mm to 6mm, the recess depth of the wall portion on the side of the second region facing the main body is 2.5mm to 6mm. On the one hand, setting the recess depth of the recessed space to be greater than or equal to 2.5mm can further increase the space inside the shell for accommodating the gas generated by the battery cell during use, so as to further alleviate the phenomenon of the internal pressure of the battery cell being greatly increased after the gas accumulates inside the shell, and it is also beneficial to further reduce the assembly difficulty of the adsorption component. On the other hand, setting the recess depth of the recessed space to be less than or equal to 6mm can further reduce the molding difficulty of the wall portion, and can further alleviate the phenomenon of the wall portion occupying too much space in the first direction due to the excessive depth of the wall portion recess, so as to further optimize the overall size of the battery cell.

[0023] In some embodiments, the electrode terminals are disposed in the first region.

[0024] In the above technical solution, by setting the electrode terminals on the first region of the wall, on the one hand, it is convenient to connect the electrode terminals to the tabs of the electrode assembly, which helps to reduce the assembly difficulty between the electrode terminals and the tabs. On the other hand, it can increase the space inside the shell for accommodating the gas generated by the battery cell during use without excessively affecting the structural strength of the first region of the wall for mounting the electrode terminals and the spatial dimensions of the wall for mounting the electrode terminals. This can alleviate the phenomenon that the gas generated by the electrode assembly with active metals during use accumulates inside the shell, causing a sharp increase in the internal pressure of the battery cell.

[0025] In some embodiments, the tab protrudes from one end of the main body facing the wall in the first direction, and the tab is located on one side of the electrode terminal in the second direction; wherein, along the first direction, at least a portion of the tab is accommodated within the recessed space.

[0026] In the above technical solution, by setting at least a portion of the tab to be accommodated in the recessed space along the first direction, on the one hand, the wall can reserve space for the tab, which helps to reduce the risk of short circuit caused by the wall pressing down on the tab and inserting the tab into the main body, thereby improving the reliability of the battery cell. On the other hand, the tab and the electrode terminal, as well as the tab and the wall, can share space in the first direction, which helps to improve the internal space utilization of the battery cell and thus improve the energy density of the battery cell.

[0027] In some embodiments, the wall portion includes at least two second regions spaced apart along the second direction; wherein, along the first direction, the tabs and the adsorption element are respectively accommodated in different recessed spaces.

[0028] In the above technical solution, the wall portion is formed with at least two second regions arranged at intervals along the second direction, such that at least two recessed spaces are formed on the side of the wall portion facing the main body portion. By accommodating the tabs and the adsorption components in different recessed spaces, the interference between the tabs and the adsorption components can be reduced, and the assembly difficulty of the tabs and the adsorption components can be reduced.

[0029] In some embodiments, along the second direction, the tabs and the adsorption element are located on opposite sides of the electrode terminal, respectively.

[0030] In the above technical solution, by setting the tabs and the adsorption element on both sides of the electrode terminal in the second direction, the electrode terminal can separate the tabs and the adsorption element. On the one hand, this can further reduce the interference between the tabs and the adsorption element, and on the other hand, it can reduce the assembly difficulty between the tabs and the electrode terminal.

[0031] In some embodiments, the wall portion includes two first regions and three second regions, the first regions and the second regions being alternately arranged along the second direction, and the battery cell including two electrode terminals with opposite polarities, one electrode terminal being disposed in one of the first regions and the other electrode terminal being disposed in the other first region; wherein, along the second direction, the adsorption member is located between the two electrode terminals; or, along the second direction, the tab is located between the two electrode terminals.

[0032] In the above technical solution, by setting the adsorption element between the two electrode terminals in the second direction, the tab is positioned outside the two electrode terminals in the second direction. This structure in the battery cell achieves separation between the two electrode terminals, reducing interference and thus simplifying assembly. It also reduces the risk of short circuits between the two electrode terminals. Furthermore, it reduces the assembly difficulty of the adsorption element and allows for expansion of the second region between the two electrode terminals in the second direction, facilitating an increase in the size of the adsorption element. Similarly, by setting the tab between the two electrode terminals in the second direction, the adsorption element is positioned outside the two electrode terminals. This structure in the battery cell also achieves separation between the two electrode terminals, reducing interference and thus simplifying assembly. It also reduces the risk of short circuits between the two electrode terminals and allows for expansion of the second region between the two electrode terminals in the second direction, facilitating adjustment of the tab's position.

[0033] In some embodiments, the battery cell further includes a current collector; the current collector includes a first connecting portion, a bent portion and a second connecting portion arranged and connected in sequence along the second direction, the first connecting portion being connected to the electrode terminal and the second connecting portion being connected to the tab; wherein, along the first direction, the second connecting portion is further away from the main body than the first connecting portion, and at least a portion of the second connecting portion is located within the recessed space accommodating the corresponding tab.

[0034] In the above technical solution, the current collector is provided with a first connecting part, a bending part and a second connecting part arranged and connected in sequence along the second direction. The first connecting part and the second connecting part are respectively connected to the electrode terminal and the electrode tab to realize the electrical connection between the electrode assembly and the electrode terminal. In this way, by setting the second connecting part of the current collector to be further away from the main body in the first direction than the first connecting part of the current collector, and at least part of the second connecting part is located in the recessed space that accommodates the corresponding electrode tab, both the electrode tab and the corresponding second connecting part are at least partially accommodated in the recessed space. The current collector with this structure can realize the electrical connection between the electrode terminal and the electrode tab while realizing that the electrode tab is located on one side of the electrode terminal in the second direction, so as to facilitate the connection between the current collector and the electrode terminal and the electrode tab, which helps to reduce the assembly difficulty of the battery cell. On the other hand, it can realize that the current collector and the electrode terminal and the current collector and the wall share part of the space in the first direction, which helps to optimize the internal layout of the battery cell and improve the internal space utilization of the battery cell, thereby improving the energy density of the battery cell.

[0035] In some embodiments, along the first direction, the electrode is located on the side of the second connection portion facing the main body portion.

[0036] In the above technical solution, by setting the tab to a structure located on the side of the second connecting part of the current collector facing the main body, the tab is at least partially located within the space defined by the second connecting part and the bending part. On the one hand, this facilitates the assembly and connection of the tab and the second connecting part, which helps to reduce the assembly difficulty between the tab and the current collector. On the other hand, it enables the tab and the bending part of the current collector to share a space in the first direction, which helps to improve the internal space utilization of the battery cell and optimize the internal layout of the battery cell. It also reduces the risk of short circuit caused by the current collector pressing down on the tab and inserting the tab backward into the main body, thereby improving the reliability of the battery cell.

[0037] In some embodiments, along the first direction, the electrode terminal is located on the side of the first connection portion opposite to the main body portion.

[0038] In the above technical solution, by setting the electrode terminal to a structure located on the side of the first connecting part of the current collector that is away from the main body, the electrode terminal is at least partially located in the space defined by the first connecting part and the bending part. On the one hand, it is convenient to assemble and connect the electrode terminal with the first connecting part, which helps to reduce the assembly difficulty between the electrode terminal and the current collector. On the other hand, it enables the electrode terminal and the bending part of the current collector to share a space in the first direction, which helps to improve the internal space utilization of the battery cell and optimize the internal layout of the battery cell.

[0039] In some embodiments, the battery cell further includes an insulating member; the insulating member is disposed between the wall portion and the electrode assembly, and the insulating member is configured to insulate the wall portion and the electrode assembly; wherein, along the first direction, the adsorption member is disposed between the wall portion and the insulating member; or, along the first direction, the adsorption member is disposed between the body portion and the insulating member.

[0040] In the above technical solution, an insulating component is also provided between the wall and the electrode assembly. This insulating component provides insulation and isolation between the wall and the electrode assembly, which helps reduce the risk of short circuits in the battery cell during use. Furthermore, by placing the adsorbent between the wall and the insulating component, the insulating component and the wall provide a certain degree of stability to the adsorbent, and the assembly is relatively simple and easy to operate, thus reducing the assembly difficulty of the battery cell. Similarly, by placing the adsorbent between the insulating component and the main body, the obstruction and blockage of the adsorbent by the insulating component can be reduced, which helps increase the contact area between the adsorbent and the gas inside the casing, thereby improving the adsorption effect of the adsorbent on the hydrogen generated inside the battery cell during recycling.

[0041] In some embodiments, along the first direction, a receiving groove is provided on the side of the insulating member facing the adsorption member, and at least a portion of the adsorption member is received in the receiving groove.

[0042] In the above technical solution, by setting a receiving groove on the side of the insulating component facing the adsorption component, and at least part of the adsorption component being a structure that is accommodated in the receiving groove, the insulating component can play a certain positioning and limiting role for the adsorption component, which is conducive to improving the assembly quality of the adsorption component and reducing the risk of shaking or displacement of the adsorption component during use. On the other hand, the insulating component and the adsorption component can share space in the first direction, which is conducive to improving the internal space utilization rate of the battery cell and thus improving the energy density of the battery cell.

[0043] In some embodiments, the bottom surface of the receiving groove is provided with a through hole, which penetrates the insulating member along the first direction.

[0044] In the above technical solution, by setting through holes on the bottom surface of the receiving groove of the insulating component, and the through holes are structured to penetrate the insulating component along the first direction, the obstruction and blockage of the insulating component on the adsorption component can be reduced, which is conducive to further increasing the contact area between the adsorption component and the gas inside the shell. This further enhances the adsorption effect of the adsorption component on the hydrogen generated inside the battery cell during the cycle, thereby further alleviating the phenomenon of a sharp increase in the internal pressure of the battery cell caused by the accumulation of gas inside the shell.

[0045] In some embodiments, along the first direction, the insulating member abuts against the body portion and the wall portion.

[0046] In the above technical solution, by setting the insulating component to abut against the main body and the wall in the first direction, the stability and reliability of the insulating component assembled in the housing can be improved, which helps to reduce the risk of shaking or displacement of the insulating component during use. On the other hand, the tightness of the insulating component assembled in the housing can be improved, which helps to improve the internal space utilization of the battery cell and thus improve the energy density of the battery cell.

[0047] In some embodiments, the wall portion includes only one first region and the wall portion includes two second regions, and the electrode terminal is disposed in the first region; wherein, along the second direction, the first region is connected between the two second regions.

[0048] In the above technical solution, by setting the first region of the wall as one and connecting the first region between the two second regions in the second direction, the two second regions are respectively located at both ends of the wall in the second direction. The battery cell with this structure is convenient for the forming of the wall, which helps to reduce the manufacturing difficulty of the wall and reduces the difficulty of assembling the adsorption component into the recessed space. On the other hand, it can increase the size of the first region in the second direction, which helps to reduce the difficulty of assembling electrode terminals on the first region.

[0049] In some embodiments, the wall portion includes two first regions, and the battery cell includes two electrode terminals, one electrode terminal being disposed in one first region and the other electrode terminal being disposed in the other first region; wherein, along the second direction, a second region connects the two first regions.

[0050] In the above technical solution, by setting the first region of the wall to two, each electrode terminal is set on one of the first regions, and a second region is connected between the two first regions, so that a recessed space is formed between the two electrode terminals on the side of the wall facing the main body. The battery cell with this structure can reduce the assembly interference between the two electrode terminals and realize that the two electrode terminals of the battery cell can be assembled on the same side of the shell, which helps to reduce the assembly difficulty of the battery cell. On the other hand, the size of the second region located between the two first regions in the second direction can be increased according to the actual situation, so as to increase the spatial size of the recessed space.

[0051] In some embodiments, along the second direction, each of the first regions is connected to both ends of the second region.

[0052] In the above technical solution, by providing a second region at both ends of each first region, a second region is also formed on the outer side of the two second regions along the second direction, thereby increasing the number of recessed spaces formed by the wall. This further expands the space inside the casing for accommodating the gas generated by the battery cell during use, thereby further alleviating the phenomenon of a sharp increase in the internal pressure of the battery cell caused by the accumulation of gas generated by the electrode assembly with active metal during use. This further reduces the occurrence of bulging or deformation of the battery cell during use, thereby further reducing the risk of connection failure or leakage of the casing during use, which is beneficial to improving the service life and reliability of the battery cell.

[0053] In some embodiments, in a projection plane perpendicular to the first direction, the orthographic projection of the wall portion is rectangular, and the size of the orthographic projection of the wall portion in the second direction is greater than the size of the orthographic projection of the wall portion in the third direction, wherein the first direction, the second direction, and the third direction are perpendicular to each other.

[0054] In the above technical solution, the projection of the wall portion in the first direction is a rectangular structure, and in the projection plane perpendicular to the first direction, the size of the orthographic projection of the wall portion in the second direction is greater than the size of the orthographic projection of the wall portion in the third direction, so that the arrangement direction of the first region and the second region of the wall portion is the length direction of the wall portion, thereby facilitating the formation of the first region and the second region on the wall portion and helping to reduce the manufacturing difficulty of the wall portion.

[0055] In some embodiments, the housing includes a shell and an end cap; the shell includes an integrally formed sidewall and a bottom wall, the sidewall surrounding the bottom wall, one end of the sidewall being connected to the bottom wall along the first direction, and the other end forming an opening, the sidewall and the bottom wall together defining a receiving cavity, in which at least a portion of the electrode assembly is received; the end cap closes the opening; wherein, the end cap is the wall portion; or, the bottom wall is the wall portion.

[0056] In the above technical solution, by setting the wall of the outer casing as an end cap for closing the opening, the battery cell with this structure facilitates the processing and forming of the first and second regions on the wall, and facilitates the assembly of the adsorption component into the recessed space of the wall, thereby reducing the manufacturing difficulty of the battery cell and improving its production efficiency. By setting the wall of the outer casing as the bottom wall of the casing opposite to the end cap in the first direction, the battery cell with this structure can ensure that the area of ​​the outer casing with electrode terminals is far away from the end cap, and there is no direct connection between the wall and the end cap. This reduces the impact of stress generated by the connection between the end cap and the casing on the first and second regions of the wall, thereby reducing the risk of deformation, collapse, or cracking of the wall during use, and improving the service life and reliability of the battery cell.

[0057] In some embodiments, the active metal element includes at least one of lithium, sodium, potassium, zinc, or aluminum.

[0058] In the above technical solution, by setting the active metal of the negative electrode active material layer of the negative electrode sheet of the main body to at least one of lithium, sodium, potassium, zinc or aluminum, it is beneficial to improve the reaction activity of the electrode assembly during use, thereby improving the performance of the battery cell.

[0059] In some embodiments, the solvent includes an ether solvent, which includes at least one of 1,2-dimethoxypropane, dimethoxymethane, ethylene glycol dimethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, pentaethylene glycol dimethyl ether, polyethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol diethyl ether, triethylene glycol diethyl ether, tetraethylene glycol diethyl ether, pentaethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dibutyl ether, or 1,3-dioxane.

[0060] In the above technical solution, the battery cell with this structure can reduce the gas generated inside the battery cell during the cycle, so as to further alleviate the phenomenon of the battery cell's internal pressure increasing sharply after the gas accumulates inside the casing. This can further reduce the occurrence of bulging or deformation of the battery cell during use, thereby further reducing the risk of connection failure or leakage of the casing during use, which is conducive to further improving the service life and reliability of the battery cell.

[0061] In some embodiments, the solvent comprises an ester solvent, which includes at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, or diethyl sulfone.

[0062] In the above technical solution, the battery cell with this structure can reduce the gas generated inside the battery cell during the cycle, so as to further alleviate the phenomenon of the battery cell's internal pressure increasing sharply after the gas accumulates inside the casing. This can further reduce the occurrence of bulging or deformation of the battery cell during use, thereby further reducing the risk of connection failure or leakage of the casing during use, which is conducive to further improving the service life and reliability of the battery cell.

[0063] Secondly, embodiments of this application also provide a battery device, including the aforementioned battery cell.

[0064] Thirdly, embodiments of this application also provide an electrical device, including the aforementioned battery cell, wherein the battery cell is used to provide electrical energy. Attached Figure Description

[0065] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0066] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0067] Figure 2 Exploded views of the structure of the battery device provided in some embodiments of this application;

[0068] Figure 3This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0069] Figure 4 Exploded views of the structure of a single battery cell provided in some embodiments of this application;

[0070] Figure 5 Cross-sectional views of a battery cell provided in some embodiments of this application;

[0071] Figure 6 for Figure 5 A magnified view of part A of the shown battery cell;

[0072] Figure 7 A cross-sectional view of the wall portion of the casing of a battery cell provided in some embodiments of this application;

[0073] Figure 8 for Figure 7 A magnified view of a portion of the wall at point B;

[0074] Figure 9 A cross-sectional view of a battery cell provided for some embodiments of this application;

[0075] Figure 10 for Figure 9 A magnified view of part C of the battery cell shown;

[0076] Figure 11 Cross-sectional views of current collection components provided in some embodiments of this application;

[0077] Figure 12 A cross-sectional view of a battery cell provided in some embodiments of this application;

[0078] Figure 13 for Figure 12 A magnified view of part D of the battery cell shown;

[0079] Figure 14 Cross-sectional views of a battery cell provided for other embodiments of this application;

[0080] Figure 15 for Figure 14 A magnified view of part E of the shown battery cell;

[0081] Figure 16 A schematic diagram of the structure of the insulating component of a battery cell provided in some embodiments of this application;

[0082] Figure 17 A schematic diagram of the structure of the insulating component of a battery cell provided in some embodiments of this application;

[0083] Figure 18A cross-sectional view of the wall portion of the casing of a battery cell provided in some embodiments of this application in other embodiments;

[0084] Figure 19 A cross-sectional view of the wall portion of the casing of a battery cell provided in some embodiments of this application, in other embodiments.

[0085] Icons: 1000 - Vehicle; 100 - Battery assembly; 10 - Housing; 11 - First housing body; 12 - Second housing body; 20 - Battery cell; 21 - Casing; 211 - Wall; 2111 - First region; 2111a - First surface; 2111b - Third surface; 2111c - Electrode lead-out hole; 2112 - Second region; 2112a - Second surface; 2112b - Fourth surface; 2113 - Connection area; 2114 - Recessed space; 212 - Shell Body; 2121-Opening; 213-End cap; 22-Electrode terminal; 23-Electrode assembly; 231-Main body; 232-Electrode tab; 24-Adsorption component; 25-Current collector; 251-First connection part; 252-Bending part; 253-Second connection part; 26-Pressure relief component; 27-Insulating component; 271-Receiving groove; 272-Mounting hole; 273-Through hole; 200-Controller; 300-Motor; X-First direction; Y-Second direction; Z-Third direction. Detailed Implementation

[0086] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0087] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0088] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0089] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0090] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0091] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0092] In this application, "multiple" means two or more (including two).

[0093] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0094] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0095] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, helps prevent short circuits to some extent while allowing active ions to pass through.

[0096] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0097] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0098] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0099] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as battery positive electrode active materials may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate may include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium iron manganese phosphate, and lithium iron manganese phosphate and carbon composites. Examples of lithium transition metal oxide may include, but are not limited to, lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, and lithium nickel cobalt manganese oxide (such as LiNi). 1 / 3 Co 1 / 3 Mn 1 / 3 O2 (also known as NCM) 333 LiNi 0.5 Co 0.2 Mn 0.3 O2 (also known as NCM) 523 LiNi 0.5 Co 0.25 Mn 0.25 O2 (also known as NCM) 211 LiNi 0.6 Co 0.2 Mn 0.2 O2 (also known as NCM)622 LiNi 0.8 Co 0.1 Mn 0.1 O2 (also known as NCM) 811 ), lithium nickel cobalt aluminum oxide (such as LiNi) 0.85 Co 0.15 Al 0.05 At least one of O2 and its modified compounds.

[0100] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloys, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, lithium source material, potassium metal, or sodium metal can also be filled and / or deposited within the foamed metal, where the lithium source material is lithium metal and / or a lithium-rich material.

[0101] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0102] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrode, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0103] As an example, the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0104] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0105] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0106] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0107] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0108] In some embodiments, the separator is a separator membrane. The separator membrane can be of various types, and any known porous separator membrane with good chemical and mechanical stability can be selected.

[0109] As an example, the material of the separator may include at least one of glass fiber, nonwoven fabric, polyethylene, polypropylene, and polyvinylidene fluoride. The separator may be a single-layer film or a multi-layer composite film. When the separator is a multi-layer composite film, the materials of each layer may be the same or different. The separator may be a separate component located between the positive and negative electrodes, or it may be attached to the surfaces of the positive and negative electrodes.

[0110] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0111] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. The electrolyte can be liquid, gel-like, or solid. Liquid electrolytes include electrolyte salts and solvents.

[0112] In some embodiments, the electrolyte salt may include at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0113] In some embodiments, the solvent may include at least one selected from ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more selected from ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0114] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0115] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0116] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0117] As an example, inorganic solid electrolytes may include one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphate sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0118] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0119] In some implementations, the electrode assembly has a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0120] In some implementations, the electrode assembly has a stacked structure.

[0121] As an example, multiple positive and negative electrodes can be set, and multiple positive and multiple negative electrodes can be stacked alternately.

[0122] As an example, multiple positive electrode plates can be provided, and negative electrode plates can be folded to form multiple stacked folded segments, with a positive electrode plate sandwiched between adjacent folded segments.

[0123] As an example, both the positive and negative electrode plates are folded to form multiple stacked folded segments.

[0124] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0125] As an example, the separators can be continuously arranged, either by folding or rolling between any adjacent positive or negative electrode plates.

[0126] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0127] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0128] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0129] As an example, a battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include, but are not limited to, square battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries.

[0130] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0131] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0132] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0133] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0134] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0135] As an example, the enclosure may include a first enclosure body and a second enclosure body. The first enclosure body and the second enclosure body are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, which can be either sealed or unsealed. The first enclosure body may be a top cover or a bottom plate.

[0136] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0137] As an example, the housing can be part of the vehicle's chassis structure. For instance, the housing's roof can be at least part of the vehicle's floor, or the housing's frame can be at least part of the vehicle's crossbeams and longitudinal beams.

[0138] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on at least one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0139] Battery devices possess outstanding advantages such as high energy density, low environmental pollution, high power density, long service life, wide applicability, and low self-discharge coefficient, making them an important component of today's new energy development. The development of battery technology must simultaneously consider multiple design factors, such as performance parameters like energy density, cycle life, discharge capacity, and charge / discharge rate. Furthermore, the reliability of the battery device must also be taken into account.

[0140] For a typical battery cell, it includes a casing and electrode components and electrolyte housed within the casing. The casing has end caps with electrode terminals. The electrode components include a main body and tabs, with the tabs protruding from the end of the main body facing the end cap. By connecting the electrode terminals to the tabs of the electrode components, the battery cell can input or output electrical energy. However, because the active materials of the electrode components contain elemental active metals, during the cycle of the battery cell, these elemental active metals react with some organic solvents in the electrolyte to generate gas. The main component of the generated gas is hydrogen, especially in sodium batteries, which generate even more hydrogen and other gases during use. The accumulation of gas inside the casing increases the internal pressure of the battery cell, which can lead to bulging or deformation, and even casing connection failure causing leakage. This results in low reliability and a short lifespan for the battery cell.

[0141] Based on the above considerations, in order to solve the problems of low reliability and short service life of battery cells, this application provides a battery cell including a casing, electrode terminals, an electrode assembly, an electrolyte, and an adsorbent. The electrode terminals are disposed in the casing. The electrode assembly is housed within the casing and includes a main body and tabs. The tabs protrude from one end of the main body and are electrically connected to the electrode terminals. The main body includes a negative electrode sheet, which includes a negative current collector and a negative active material layer disposed on at least one side of the negative current collector. The negative active material layer includes an elemental active metal. The electrolyte is housed within the casing and includes an electrolyte salt and a solvent, the solvent including at least one of ether solvents or ester solvents. The adsorbent is disposed within the casing and includes a hydrogen adsorbent material.

[0142] In this type of battery cell, an adsorption element is installed inside the casing, and the adsorption element has a hydrogen adsorption material. This allows the adsorption element to adsorb hydrogen generated when the electrode assembly with active metals is used in ether or ester electrolytes. This alleviates the phenomenon of a sharp increase in internal pressure of the battery cell caused by gas accumulation inside the casing, thereby effectively reducing the occurrence of bulging or deformation of the battery cell during use. This reduces the risk of connection failure or leakage of the casing during use, and thus helps to improve the service life and reliability of the battery cell.

[0143] The battery cells disclosed in this application can be used, but are not limited to, in electrical devices such as vehicles, ships, or aircraft. A power system for such an electrical device can be constructed using battery cells and battery devices disclosed in this application. This helps to alleviate problems such as bulging, deformation, or leakage of battery cells during use, thereby improving the service life and reliability of the battery cells.

[0144] This application provides an electrical device that uses a single battery cell or battery assembly as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0145] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0146] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is installed inside the vehicle 1000. The battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to supply power to the vehicle 1000; for example, the battery device 100 can serve as the operating power source or general power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 controls the battery device 100 to supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0147] In some embodiments of this application, the battery device 100 can not only serve as the operating power or power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0148] Please refer to Figure 2 and Figure 3 , Figure 2 This is an exploded view of the structure of the battery device 100 provided in some embodiments of this application. Figure 3 This is a schematic diagram of the structure of a battery cell 20 provided in some embodiments of this application. The battery device 100 includes a housing 10 and battery cells 20, which are housed within the housing 10.

[0149] The housing 10 provides assembly space for the battery cell 20, and can adopt various structures. In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, which overlap each other, and together define an assembly space for accommodating the battery cell 20. The second housing body 12 may be a hollow structure open at one end, and the first housing body 11 may be a plate-like structure, with the first housing body 11 covering the open side of the second housing body 12 so that the first housing body 11 and the second housing body 12 together define the assembly space; alternatively, the first housing body 11 and the second housing body 12 may both be hollow structures open on one side, with the open side of the first housing body 11 covering the open side of the second housing body 12.

[0150] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder, a cuboid, or a cube. For example, in... Figure 2 In the middle, the shape of box 10 is a cuboid.

[0151] In the battery device 100, there can be one or more battery cells 20 disposed within the housing 10. When there are multiple battery cells 20 disposed within the housing 10, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 20 are connected in both series and parallel configurations. Multiple battery cells 20 can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells 20 is housed within the housing 10. Alternatively, the battery device 100 can also consist of multiple battery cells 20 first connected in series, in parallel, or in a mixed configuration to form battery modules, and then multiple battery modules are connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 10.

[0152] In some embodiments, the battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar for connecting multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0153] The battery cell 20 can be in the form of a cuboid, cylinder, prism, or other shapes. For example, in... Figure 3 In the middle, the battery cell 20 has a cuboid structure.

[0154] According to some embodiments of this application, refer to Figure 3 Please refer to further details. Figure 4 , Figure 5 and Figure 6 , Figure 4 This is an exploded view of the structure of a battery cell 20 provided in some embodiments of this application. Figure 5 This is a cross-sectional view of a battery cell 20 provided in some embodiments of this application. Figure 6 for Figure 5 The image shows a partial enlarged view of point A of the battery cell 20. This application provides a battery cell 20, which includes a housing 21, electrode terminals 22, an electrode assembly 23, an electrolyte, and an adsorbent 24. The electrode terminals 22 are disposed within the housing 21. The electrode assembly 23 is housed within the housing 21 and includes a main body 231 and tabs 232. The tabs 232 protrude from one end of the main body 231 and are electrically connected to the electrode terminals 22. The main body 231 includes a negative electrode sheet, which includes a negative current collector and a negative active material layer disposed on at least one side of the negative current collector. The negative active material layer includes an elemental active metal. The electrolyte is housed within the housing 21 and includes an electrolyte salt and a solvent, the solvent including at least one of ether solvents or ester solvents. The adsorbent 24 is disposed within the housing 21 and includes a hydrogen adsorbent material.

[0155] The outer shell 21 can have various structural forms, such as a cylinder or a cuboid. Similarly, the outer shell 21 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0156] Optionally, the housing 21 may include a housing 212 and an end cap 213. The housing 212 has an internal cavity for accommodating the electrode assembly 23 and has an opening 2121. That is, the housing 212 is a hollow structure with an opening 2121 at one end. The end cap 213 covers the opening 2121 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 23 and the electrolyte.

[0157] The housing 212 includes a bottom wall and a side wall. The bottom wall is disposed opposite to the end cap 213. The side wall surrounds the bottom wall, and one end of the side wall is connected to the bottom wall, while the other end forms an opening 2121.

[0158] When assembling the battery cell 20, the electrode assembly 23 can be placed into the housing 212 first, and the electrolyte can be filled into the housing 212. Then, the end cap 213 can be closed onto the opening 2121 of the housing 212 to complete the assembly of the battery cell 20.

[0159] The housing 212 can have various shapes, such as a cylinder, cuboid, or prism. The shape of the housing 212 can be determined based on the specific shape of the electrode assembly 23. For example, if the electrode assembly 23 is a cylinder, a cylindrical housing 212 can be used; if the electrode assembly 23 is a cuboid, a cuboid housing 212 can be used. Of course, the end cap 213 can also have various structures, such as a plate-like structure or a hollow structure open at one end. For example, in… Figure 3 and Figure 4 In the middle, the shell 212 has a cuboid structure.

[0160] Of course, it is understandable that the outer casing 21 is not limited to the structure described above. The outer casing 21 can also be other structures. For example, the outer casing 21 can include a housing 212 and two end caps 213. The housing 212 is a hollow structure with openings 2121 formed on both opposite sides. One end cap 213 is fitted onto one opening 2121 of the housing 212 and forms a sealed connection to form a sealed space for accommodating the electrode assembly 23 and the electrolyte. That is, the housing 212 has openings 2121 formed on both opposite sides, and the two end caps 213 are fitted onto both sides of the housing 212 to close the corresponding openings 2121.

[0161] In this embodiment, the electrode assembly 23 includes a main body 231 and tabs 232. The main body 231 is the primary component of the electrode assembly 23 for electrochemical reactions to occur in the battery cell 20. For example, in... Figure 4 and Figure 5 In the middle, the outer shell 21 has a wall portion 211, the electrode terminal 22 is disposed on the wall portion 211, and the electrode tab 232 is connected to the end of the main body portion 231 facing the wall portion 211 in the first direction X. That is, in the first direction X, the electrode tab 232 is located between the main body portion 231 and the wall portion 211 so that the electrode tab 232 can be connected to the electrode terminal 22.

[0162] Optionally, the structure of the main body 231 can be various. For example, the main body 231 can be a wound structure formed by winding a positive electrode, an separator, and a negative electrode, or it can be a stacked structure formed by arranging the positive electrode, an separator, and a negative electrode in layers. Exemplarily, in the embodiment of this application, the main body 231 of the electrode assembly 23 is a wound structure formed by winding a positive electrode, an separator, and a negative electrode, and the winding center axis of the main body 231 extends along the first direction X.

[0163] For example, the separator is a separator membrane, and the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride.

[0164] The positive electrode includes a positive current collector and a positive active material layer disposed on at least one side of the positive current collector, the positive active material layer comprising a positive active material. The negative electrode includes a negative current collector and a negative active material layer disposed on at least one side of the negative current collector, the negative active material layer comprising a negative active material. In the embodiments of this application, the negative active material layer of the negative electrode includes an elemental active metal. It can be understood that an active metal refers to a metal that can provide active metal ions. For example, the elemental active metal of the lithium-alkali metal battery cell 20 is elemental lithium, and the elemental active metal of the sodium-alkali metal battery cell 20 is elemental sodium. Correspondingly, in the above-mentioned types of battery cells 20, the active metal on the negative electrode is relatively active and will undergo side reactions with water, solvents in the electrolyte and residual alkali in the positive active material, resulting in a large amount of gas production, and the proportion of hydrogen in the gas is >90%.

[0165] It should be noted that each electrode assembly 23 has two tabs 232. Both tabs 232 are connected to the end of the main body 231 facing the wall portion 211 in the first direction X. The two tabs 232 have opposite polarities and are spaced apart along the second direction Y. That is, the two tabs 232 are the positive tab and the negative tab of the electrode assembly 23, respectively. Correspondingly, the tab 232 connected to the positive electrode plate of the main body 231 is the positive tab, and the tab 232 connected to the negative electrode plate of the main body 231 is the negative tab.

[0166] It should be noted that the tab 232 and the positive electrode plate, as well as the tab 232 and the negative electrode plate, can be an integrally formed structure or a separate structure. If the tab 232 and the positive electrode plate are integrally formed, then the tab 232 and the positive current collector of the positive electrode plate are formed by cutting the same metal foil, and the tab 232 is connected to one end of the positive current collector of the positive electrode plate in the first direction X. Similarly, if the tab 232 and the negative electrode plate are integrally formed, then the tab 232 and the negative current collector of the negative electrode plate are formed by cutting the same metal foil, and the tab 232 is connected to one end of the negative current collector of the negative electrode plate in the first direction X. If the tab 232 and the positive electrode plate are separate structures, then the tab 232 is connected to one end of the positive current collector of the positive electrode plate in the first direction X, for example, by welding. Similarly, if the tab 232 and the negative electrode plate are separate structures, then the tab 232 is connected to one end of the negative current collector of the negative electrode plate in the first direction X, for example, by welding.

[0167] Optionally, the electrode assembly 23 housed within the housing 21 can be one or more. For example, in... Figure 4 In this embodiment, the outer casing 21 of the battery cell 20 contains two electrode assemblies 23, which are stacked along the third direction Z. Of course, in other embodiments, the number of electrode assemblies 23 contained in the outer casing 21 of the battery cell 20 can be three, four, five or six, etc.

[0168] Wherein, the first direction X is the height direction of the battery cell 20, the second direction Y is the length direction of the battery cell 20, and the third direction Z is the thickness direction of the battery cell 20. The first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

[0169] In this embodiment, the electrode terminal 22 serves to electrically connect to the electrode assembly 23, acting as the output or input electrode of the battery cell 20, thereby enabling the output or input of electrical energy from the battery cell 20.

[0170] The electrode terminal 22 is insulated and mounted on the housing 21, meaning that there is no electrical connection between the electrode terminal 22 and the housing 21.

[0171] For example, in Figure 4 and Figure 5 In this embodiment, the electrode terminal 22 is disposed on the wall portion 211, that is, the electrode terminal 22 and the tab 232 are both located on the same side of the main body portion 231 in the first direction X. Of course, in other embodiments, the electrode terminal 22 may also be disposed on other walls of the housing 21.

[0172] Alternatively, the electrode terminal 22 can be made of various materials, such as copper, iron, aluminum, steel, or aluminum alloy.

[0173] exist Figure 3 and Figure 4 In the battery cell 20, there are two electrode terminals 22. The two electrode terminals 22 are spaced apart on the wall portion 211 along the second direction Y. The two electrode terminals 22 are respectively connected to the two tabs 232 of the electrode assembly 23 to cooperate in inputting or outputting the electrical energy of the battery cell 20.

[0174] It should be noted that the electrical connection between electrode terminal 22 and electrode tab 232 can be a direct connection or an indirect connection. For example, in... Figure 4 and Figure 5 In the battery cell 20, there may also be two current collectors 25. Both current collectors 25 are disposed inside the housing 21 and are spaced apart along the second direction Y. Each current collector 25 is used to connect an electrode terminal 22 and a tab 232 of the same polarity in multiple electrode assemblies 23 to realize the electrical connection between the two electrode terminals 22 and the electrode assembly 23, which helps to reduce the assembly difficulty between the tab 232 of the electrode assembly 23 and the electrode terminal 22.

[0175] Optionally, the connection structure between the electrode terminal 22 and the current collector 25, and between the tab 232 and the current collector 25, can be various, such as welding connection or abutment connection.

[0176] For example, the material of the current collector 25 can be various, such as copper, iron, aluminum, steel or aluminum alloy.

[0177] In this embodiment, the negative electrode active material layer includes an elemental active metal, such as sodium or lithium. The elemental metal is deposited on the negative electrode current collector, and it reacts with some organic solvents in the electrolyte to generate gas, primarily hydrogen. Specifically, the organic solvents in the electrolyte used in conventional lithium batteries include lipid solvents. However, because sodium metal is more reactive, the lipid solvent is replaced with an ether solvent. Sodium metal and the ether solvent will still react to generate hydrogen. Therefore, an adsorption element 24 is provided between the wall 211 of the outer casing 21 and the electrode assembly 23. The adsorption element 24 includes a hydrogen adsorption material, enabling it to adsorb the hydrogen generated inside the battery cell 20 during use.

[0178] Hydrogen adsorption materials refer to materials capable of absorbing hydrogen, including the following categories: Inorganic hydrogen adsorption materials: such as palladium (Pd), potassium bicarbonate (KHCO3) or sodium bicarbonate (NaHCO3), lithium nitride (Li3N), hydrogen storage alloys, etc.; Organic hydrogen adsorption materials: such as benzene and toluene, etc.; Nanomaterials for hydrogen adsorption: usually hydrogen adsorption materials are nano-sized, utilizing the large specific surface area and special chemical properties of nanomaterials to achieve the purpose of hydrogen adsorption; Carbonaceous materials: such as high specific surface area activated carbon (AC), graphite nanofibers (GNF), carbon nanotubes (CNT), etc.; Coordination hydrides: utilizing alkali metals (Li, Na, K, etc.) or alkaline earth metals (Mg, Ca, etc.) to form coordination hydrides with hydrogen to achieve the purpose of hydrogen adsorption.

[0179] In one embodiment, the hydrogen adsorption material may include a hydrogen storage alloy, which may optionally include one or more of rare earth hydrogen storage alloys, magnesium hydrogen storage alloys, and titanium hydrogen storage alloys.

[0180] Hydrogen storage alloys are a new type of alloy that, under certain conditions, can absorb and store hydrogen by forming hydrides, and can also release hydrogen under certain conditions. From the perspective of hydrogen storage mechanism, hydrogen storage alloys can be divided into two categories. One type relies on hydride solid solutions for hydrogen storage: hydrogen atoms gradually enter the interstitial sites of the alloy to form a solid solution, maintaining the crystal structure unchanged, such as titanium-based and rare-earth-based hydrogen storage alloys. The other type relies on metal hydrides for hydrogen storage: the parent phase of the alloy decomposes, and then hydrides are gradually precipitated, such as magnesium-based hydrogen storage alloys.

[0181] Metallic elements that can combine with hydrogen to form hydrides can generally be divided into two categories: A-side metals, such as Ti, Zr, Ca, Mg, V, Nb, and rare earth elements, readily react with hydrogen to form stable hydrides, releasing a large amount of heat; these are called exothermic metals. B-side metals, such as Fe, Co, Ni, Cr, Cu, and Al, have a low affinity for hydrogen and do not readily form hydrides; the dissolution of hydrogen in these metals is an endothermic reaction, hence they are called endothermic metals. Currently, hydrogen storage alloys under research and development primarily combine A-side and B-side metals to create hydrogen storage alloys with reversible hydrogen absorption and desorption capabilities at suitable temperatures. These hydrogen storage alloys can be mainly classified into the following categories: AB5 type (rare earth based), AB2 type (zirconium and titanium based), AB type (iron-titanium based), and A2B type (magnesium based) hydrogen storage alloys.

[0182] Among them, magnesium-based hydrogen storage alloys have excellent hydrogen absorption performance at room temperature and pressure, making them suitable for use in battery systems; rare earth-based hydrogen storage alloys are among the best performing hydrogen storage alloys. Taking LaNi5 as an example, LaNi5 can be hydrogenated by reacting with hydrogen at several atmospheres at room temperature to form LaNi5H6, with a hydrogen storage capacity of about 1.4 wt%. It has a fast hydrogen absorption and desorption rate and is very suitable for use at room temperature; titanium-based AB2-type hydrogen storage alloys mainly include two categories: TiMn-based and TiCr-based. TiMn-based hydrogen storage alloys can achieve a hydrogen storage capacity of 1.8 wt%.

[0183] When hydrogen storage alloys are used as hydrogen absorption materials in battery environments, the amount of hydrogen storage alloy used can be calculated based on the specific gas production of the battery, achieving on-demand quantification of hydrogen storage alloys. Furthermore, the hydrogen absorption rate can be increased by increasing the amount of hydrogen storage alloy, using small-particle alloy powder, or mixing in appropriate amounts of catalysts (such as titanium, iron, cobalt, nickel, copper, and other metal nanoparticles).

[0184] In some embodiments, see Figure 5 As shown, the battery cell 20 may also include a pressure relief component 26, which is disposed on the housing 21. The pressure relief component 26 is used to release the internal pressure of the battery cell 20 when the internal pressure or temperature of the battery cell 20 reaches a predetermined value.

[0185] Optionally, the pressure relief component 26 may be disposed on the end cap 213 of the housing 21, or it may be disposed on the housing 212 of the housing 21. For example, in Figure 5 In this structure, the pressure relief component 26 is disposed on the bottom wall of the housing 212. Similarly, the pressure relief component 26 and the housing 21 can be integrally formed or separately disposed. If the pressure relief component 26 and the housing 21 are separately disposed, the pressure relief component 26 can be connected to the housing 21 by means of welding or other methods. Correspondingly, the pressure relief component 26 can be a component such as an explosion-proof valve, explosion-proof disc, gas valve, pressure relief valve or safety valve. If the pressure relief component 26 and the housing 21 are integrally formed, the pressure relief component 26 is an area on the housing 21 with a weak structure, such as an area on the housing 21 with a groove.

[0186] In this embodiment, an adsorption element 24 is provided inside the outer casing 21 of the battery cell 20, and the adsorption element 24 has a hydrogen adsorption material. This allows the adsorption element 24 to adsorb the hydrogen generated when the electrode assembly 23 with active metal is used in an ether or ester electrolyte. This alleviates the phenomenon of a sharp increase in internal pressure of the battery cell 20 caused by the accumulation of gas inside the outer casing 21. As a result, it can effectively reduce the occurrence of bulging or deformation of the battery cell 20 during use, thereby reducing the risk of connection failure or leakage of the outer casing 21 during use. This is beneficial to improving the service life and reliability of the battery cell 20.

[0187] According to some embodiments of this application, refer to Figure 4 , Figure 5 and Figure 6 Please refer to further details. Figure 7 and Figure 8 , Figure 7 This is a cross-sectional view of the wall 211 of the casing 21 of the battery cell 20 provided in some embodiments of this application. Figure 8 for Figure 7 The diagram shows a partial enlarged view of section B of the wall portion 211. The outer casing 21 has the wall portion 211, and the adsorption member 24 is disposed between the wall portion 211 and the main body portion 231. The wall portion 211 includes a first region 2111 and a second region 2112. The first region 2111 and the second region 2112 are both located on the same side of the main body portion 231 in the first direction X, and the first region 2111 and the second region 2112 are arranged along the second direction Y. Along the first direction X, the first region 2111 has a first surface 2111a facing the main body portion 231, and the second region 2112 has a second surface 2112a facing the main body portion 231. The second surface 2112a is further away from the main body portion 231 than the first surface 2111a. The wall portion 211 forms a recessed space 2114 on the side of each second region 2112 facing the main body portion 231. At least a portion of the adsorption member 24 is accommodated in the recessed space 2114. The second direction Y is perpendicular to the first direction X.

[0188] The wall portion 211 includes a first region 2111 and a second region 2112. The first region 2111 and the second region 2112 are both located on the same side of the main body portion 231 in the first direction X, and the first region 2111 and the second region 2112 are arranged along the second direction Y. That is to say, the first region 2111 and the second region 2112 of the wall portion 211 are a structure that is located on one side of the main body portion 231 of the electrode assembly 23 in the first direction X, and the first region 2111 and the second region 2112 are arranged along the first direction X.

[0189] For example, in Figure 6 In the middle, electrode terminal 22 is disposed in the first region 2111, wherein, combined with Figure 6 , Figure 7 and Figure 8As shown, the first region 2111 of the wall portion 211 is provided with an electrode lead-out hole 2111c. The electrode lead-out hole 2111c penetrates the first region 2111 along the first direction X. The electrode terminal 22 is disposed in the electrode lead-out hole 2111c. That is, the electrode lead-out hole 2111c has a structure that penetrates the surfaces of both sides of the first region 2111 in the first direction X. In other words, the first region 2111 has a first surface 2111a facing the main body portion 231 and a third surface 2111b facing away from the main body portion 231 in the first direction X. The two ends of the electrode lead-out hole 2111c extend to the first surface 2111a and the third surface 2111b in the first direction X, respectively.

[0190] See Figure 6 and Figure 7 As shown, along the first direction X, the first region 2111 has a first surface 2111a facing the main body 231, and the second region 2112 has a second surface 2112a facing the main body 231. Correspondingly, the first surface 2111a is the inner surface of the first region 2111 of the wall portion 21 facing the interior of the outer shell 21, and the second surface 2112a is the inner surface of the second region 2112 of the wall portion 21 facing the interior of the outer shell 21.

[0191] See Figure 7 and Figure 8 As shown, along the first direction X, the second surface 2112a is further away from the main body 231 than the first surface 2111a. That is, the first region 2111 and the second region 2112 of the wall portion 211 are both located on the same side of the main body 231 in the first direction X, and the wall portion 211 is recessed in the second region 2112 along the first direction X in a direction away from the main body 231, so that a recessed space 2114 is formed on the side of the second region 2112 facing the main body 231. Correspondingly, the recessed space 2114 is the space on the side of the second region 2112 of the wall portion 211 facing the main body portion 231, and the recessed space 2114 is a structure that is recessed from the first surface 2111a of the first region 2111 in a direction away from the main body portion 231, so that the recessed space 2114 is formed between the first surface 2111a of the first region 2111 and the second surface 2112a of the second region 2112, and the recessed space 2114 and the second region 2112 are correspondingly arranged in the first direction X.

[0192] Optionally, if the wall portion 211 is provided with a plurality of second regions 2112, then the wall portion 211 forms a recessed space 2114 on the side of each second region 2112 facing the main body portion 231, so that the wall portion 211 forms a plurality of recessed spaces 2114. For example, in Figure 7In the middle, the wall portion 211 is provided with three second regions 2112, and three recessed spaces 2114 are formed on the side of the wall portion 211 facing the main body portion 231.

[0193] It should be noted that in embodiments where the second surface 2112a is further away from the main body 231 along the first direction X than the first surface 2111a, the first region 2111 also has a third surface 2111b facing away from the main body 231 in the first direction X, and the second region 2112 also has a fourth surface 2112b facing away from the main body 231 in the first direction X. Correspondingly, the structure of the wall portion 211 can be various. For example, in some embodiments, it can be the third surface 2111b of the first region 2111 and the second region 2112. The fourth surface 2112b of 112 is flush with and coplanar. In this structure, the wall portion 211 is a partially thinned area on the side facing the main body portion 231. Correspondingly, the thinned area of ​​the wall portion 211 is the second region 2112, and the unthinned area of ​​the wall portion 211 is the first region 2111. In some embodiments, the fourth surface 2112b of the second region 2112 can also be a structure in which the fourth surface 2112b of the second region 2112 is further away from the main body portion 231 in the first direction X than the third surface 2111b of the first region 2111. That is, the wall... Part 211 has a structure in the second region 2112 that protrudes away from the main body 231, and the second region 2112 protrudes from the fourth surface 2112b of the first region 2111. Correspondingly, in this structure, the wall part 211 also has a connecting region 2113, which is a structure connecting the first region 2111 and the second region 2112. Correspondingly, the second region 2112 and the connecting region 2113 are the parts of the wall part 211 that protrude from the fourth surface 2112b of the first region 2111. Of course, in this embodiment, the third surface 2111b of the first region 2111 can be a structure located between the second surface 2112a and the fourth surface 2112b of the second region 2112 in the first direction X, or it can be a structure in which the second surface 2112a of the second region 2112 is farther away from the main body 231 in the first direction X than the third surface 2111b of the first region 2111. That is, the second region 2112 is a structure in which the entire second region is farther away from the main body 231 in the first direction X than the first region 2111.

[0194] At least a portion of the adsorption member 24 is accommodated within the recessed space 2114. That is, the adsorption member 24 is disposed between the main body portion 231 and the wall portion 211 in the first direction X, and at least a portion of the adsorption member 24 is inserted into the recessed space 2114 along the first direction X, such that in the direction from the first surface 2111a of the first region 2111 to the third surface 2111b of the first region 2111, the adsorption member 24 extends beyond the first surface 2111a of the first region 2111.

[0195] For example, in Figure 6 In this embodiment, a portion of the adsorption member 24 is inserted into the recessed space 2114 along the first direction X. Of course, in other embodiments, the adsorption member 24 may also be a structure in which the entire adsorption member is located within the recessed space 2114.

[0196] It should be noted that in embodiments where a plurality of recessed spaces 2114 are formed on the side of the wall portion 211 facing the main body portion 231 and the electrode assembly 23 includes a plurality of adsorption members 24, the plurality of adsorption members 24 may be a structure that is accommodated in the same recessed space 2114 or a structure in which the plurality of adsorption members 24 are respectively accommodated in different recessed spaces 2114.

[0197] Optionally, the wall portion 211 forming the recessed space 2114 can be an end cap 213 of the outer casing 21, or it can be a wall of the housing 212 of the outer casing 21. Exemplarily, in Figure 3 and Figure 4 In this embodiment, the wall portion 211 is the end cap 213. Of course, the structure of the battery cell 20 is not limited to this. In other embodiments, the wall portion 211 can also be the bottom wall of the housing 212 and the end cap 213 that are disposed opposite to each other, or the wall portion 211 can also be the side wall of the housing 212 and the end cap 213 that are adjacent to each other and connected to each other.

[0198] It should be noted that in the embodiment where the electrode terminal 22 is disposed on the wall portion 211, the electrode terminal 22 may be disposed on the first region 2111 of the wall portion 211 or on the second region 2112 of the wall portion 211. For example, see [link to example]. Figure 5 and Figure 6 As shown, electrode terminals 22 are disposed on the first region 2111 of the wall portion 211.

[0199] In this embodiment, the wall portion 211 of the outer casing 21 has a first region 2111 and a second region 2112 arranged along the second direction Y. The second surface 2112a of the second region 2112 facing the main body 231 is further away from the main body 231 than the first surface 2111a of the first region 2111 facing the main body 231. This results in a recessed space 2114 formed on the side of the second region 2112 facing the main body 231. By configuring at least a portion of the adsorption member 24 to be accommodated within the recessed space 2114 of the wall portion 211, the adsorption... Annex 24 can share space with the wall 211 in the first direction X, and can also adsorb hydrogen generated by the electrode assembly 23 with active metal during the cycle, so as to alleviate the phenomenon of the internal pressure of the battery cell 20 being increased sharply after the gas accumulates inside the casing 21. This can effectively reduce the occurrence of bulging or deformation of the battery cell 20 during use, thereby reducing the risk of connection failure or leakage of the casing 21 during use. In this way, the energy density of the battery cell 20 can be improved while increasing the service life and reliability of the battery cell 20.

[0200] According to some embodiments of this application, see Figure 6 , Figure 7 and Figure 8 As shown, along the first direction X, the first region 2111 has a third surface 2111b that is opposite to the main body 231, and the second region 2112 has a fourth surface 2112b that is opposite to the main body 231. The fourth surface 2112b is further away from the main body 231 in the first direction X than the third surface 2111b. The wall portion 211 also includes a connecting region 2113, through which the first region 2111 and the second region 2112 are connected.

[0201] The third surface 2111b is the outer surface of the first region 2111 that is away from the main body 231 of the electrode assembly 23 in the first direction X. Similarly, the fourth surface 2112b is the outer surface of the second region 2112 that is away from the main body 231 of the electrode assembly 23 in the first direction X.

[0202] The fourth surface 2112b is farther away from the main body 231 in the first direction X than the third surface 2111b. That is, the second region 2112 is a structure that protrudes from the third surface 2111b of the first region 2111 away from the main body 231 in the first direction X, so that the wall portion 211 is on the side away from the main body 231 and a raised structure is formed at the position corresponding to the second region 2112.

[0203] It should be noted that the wall portion 211 also includes a connecting area 2113, through which the first region 2111 and the second region 2112 are connected. That is, the connecting area 2113 is a curved structure formed between the wall portion 211 and the first region 2111 and the second region 2112, and is used to connect the first region 2111 and the second region 2112.

[0204] In this embodiment, by setting the fourth surface 2112b of the second region 2112 away from the main body 231 to be further away from the main body 231 than the third surface 2111b of the first region 2111 away from the main body 231, the second region 2112 and the connecting region 2113 of the wall portion 211 are structured to protrude in the direction away from the main body 231 of the electrode assembly 23. Furthermore, a connecting region 2113 is formed between the first region 2111 and the second region 2112, thereby increasing the height of the wall portion 211 in the second region 2112. The recessed depth of the recessed space 2114 on the side facing the main body 231 can, on the one hand, further increase the space inside the outer shell 21 for accommodating the gas generated by the battery cell 20 during use, so as to further alleviate the phenomenon of a sharp increase in the internal pressure of the battery cell 20 after the gas accumulates inside the outer shell 21, which is conducive to reducing the occurrence of bulging or deformation of the battery cell 20 during use. On the other hand, it can reduce the difficulty of accommodating the adsorption member 24 in the recessed space 2114, and further increase the space shared by the adsorption member 24 and the wall 211, which is conducive to further improving the energy density of the battery cell 20.

[0205] In some embodiments, please continue to see Figure 6 , Figure 7 and Figure 8 As shown, along the first direction X, the second surface 2112a is farther away from the main body 231 than the third surface 2111b. That is, the second region 2112 as a whole is farther away from the main body 231 than the first region 2111 in the first direction X, so that the second region 2112 and the first region 2111 are spaced apart along the first direction X, so that the second region 2112 is a structure that protrudes from the first region 2111 and is away from the main body 231 on the third surface 2111b in the first direction X.

[0206] In this embodiment, by setting the second surface 2112a of the second region 2112 facing the main body 231 to be further away from the main body 231 than the third surface 2111b of the first region 2111 which is away from the main body 231, the second region 2112 is a structure that is further away from the main body 231 of the electrode assembly 23 in the first direction X than the first region 2111. This further increases the bulge height of the second region 2112 and the connecting region 2113 of the wall portion 211 in the first direction X, thereby further increasing the bulge height of the wall portion 211 in the first direction X. The recessed depth of the recessed space 2114 on the side of the second region 2112 facing the main body 231 can, on the one hand, further increase the space inside the outer shell 21 for accommodating the gas generated by the battery cell 20 during use, so as to further alleviate the phenomenon of the battery cell 20’s internal pressure increasing sharply after the gas accumulates inside the outer shell 21. On the other hand, it can further reduce the difficulty of accommodating the adsorption member 24 in the recessed space 2114, and further increase the space shared by the adsorption member 24 and the wall 211, which is conducive to further improving the energy density of the battery cell 20.

[0207] According to some embodiments of this application, see Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, electrode terminal 22 is disposed in the first region 2111, and in the first direction X, electrode terminal 22 protrudes from the third surface 2111b along the direction from the first surface 2111a to the third surface 2111b.

[0208] In the first direction X, the electrode terminal 22 protrudes from the third surface 2111b along the direction from the first surface 2111a to the third surface 2111b. That is, the electrode terminal 22 is a structure mounted on the first region 2111, and the end face of the electrode terminal 22 away from the main body 231 in the first direction X is further away from the main body 231 than the third surface 2111b of the first region 2111.

[0209] It should be noted that in other embodiments, the electrode terminal 22 may also be a structure disposed on the second region 2112, and correspondingly, the electrode lead-out hole 2111c is disposed on the second region 2112.

[0210] In this embodiment, by setting the electrode terminal 22 on the first region 2111 and making the electrode terminal 22 protrude from the third surface 2111b, the wall portion 211 is a second region 2112 without the electrode terminal 22 installed, and the connection area 2113 is a structure that protrudes in the direction away from the main body 231 of the electrode assembly 23. This allows the second region 2112 and the connection area 2113 of the wall portion 211 to share space with the electrode terminal 22 in the first direction X. Thus, the battery cell 20 with this structure can transfer the space outside the wall portion 211 and on the side of the electrode terminal 22 to the housing 21 without excessively increasing the overall size of the battery cell 20 in the first direction X. This effectively utilizes the space outside the wall portion 211 to increase the space inside the housing 21 for accommodating the gas generated by the battery cell 20 during use.

[0211] According to some embodiments of this application, in conjunction with Figure 6 , Figure 7 and Figure 8 As shown, in the first direction X, the electrode terminal 22 protrudes from the fourth surface 2112b along the direction from the first surface 2111a to the third surface 2111b. That is, the electrode terminal 22 is a structure mounted on the first region 2111, and in the first direction X, the end face of the electrode terminal 22 away from the main body 231 of the electrode assembly 23 is further away from the main body 231 than the fourth surface 2112b of the second region 2112 away from the main body 231.

[0212] In this embodiment, by setting the electrode terminal 22 to protrude from the fourth surface 2112b in the direction from the first surface 2111a to the third surface 2111b, the second region 2112 and the connecting region 2113 of the wall portion 211 are structured to not extend beyond the end of the electrode terminal 22 away from the main body portion 231 in the first direction X. This allows the space outside the wall portion 211 and located on the side of the electrode terminal 22 to be transferred into the housing 21, thereby increasing the space inside the housing 21 for accommodating the gas generated by the battery cell 20 during use, without increasing the overall size of the battery cell 20 in the first direction X. On the other hand, it facilitates the assembly and connection of the electrode terminal 22 with other components during the subsequent assembly of the battery cell 20, which helps to reduce the interference caused by the second region 2112 and the connecting region 2113 of the wall portion 211 to the assembly of the electrode terminal 22.

[0213] According to some embodiments of this application, in conjunction with Figure 5 , Figure 6 , Figure 7 and Figure 8As shown, the wall portion 211 may include two first regions 2111 and three second regions 2112, which are arranged alternately along the second direction Y. The battery cell 20 includes two electrode terminals 22 with opposite polarities, one electrode terminal 22 disposed in one first region 2111 and the other electrode terminal 22 disposed in the other first region 2111. Along the first direction X, the fourth surface 2112b of the second region 2112 located between the two electrode terminals 22 is further away from the main body portion 231 than the fourth surfaces 2112b of the second regions 2112 located on both sides of the two electrode terminals 22.

[0214] The wall portion 211 may include two first regions 2111 and three second regions 2112. The first regions 2111 and the second regions 2112 are arranged alternately along the second direction Y. That is, along the second direction Y, the three second regions 2112 of the wall portion 211 are arranged at intervals, and a first region 2111 is provided between every two adjacent second regions 2112. Correspondingly, each first region 2111 and each second region 2112 are connected by a connecting area 2113.

[0215] The battery cell 20 includes two electrode terminals 22 with opposite polarities, that is, the two electrode terminals 22 are respectively connected to two tabs 232 with opposite polarities of the electrode assembly 23, so that the two electrode terminals 22 serve as the positive output terminal and the negative output terminal of the battery cell 20, respectively.

[0216] One electrode terminal 22 is disposed in one first region 2111, and the other electrode terminal 22 is disposed in another first region 2111. That is, the two electrode terminals 22 are respectively installed on the two first regions 2111, so that the two electrode terminals 22 are also arranged at intervals along the second direction Y, and the wall portion 211 has a second region 2112 between the two electrode terminals 22 and on both sides of the two electrode terminals 22.

[0217] Along the first direction X, the fourth surface 2112b of the second region 2112 located between the two electrode terminals 22 is further away from the main body 231 than the fourth surface 2112b of the second region 2112 located on both sides of the two electrode terminals 22. In other words, the two second regions 2112 of the wall 211 located on both sides of the two electrode terminals 22 have a lower height in the direction away from the main body 231 in the first direction X than the second region 2112 of the wall 211 located between the two electrode terminals 22.

[0218] In this embodiment, by setting the fourth surfaces 2112b of the two second regions 2112 located at both ends of the wall portion 211 in the first direction X to be further away from the main body portion 231 than the fourth surfaces 2112b of the second region 2112 located between the two electrode terminals 22 in the first direction X, the wall portion 211 has a structure with a lower bulge height at both ends in the first direction X. This facilitates the forming of multiple second regions 2112 on the wall portion 211, which helps reduce the processing difficulty of the wall portion 211. On the other hand, it facilitates the connection of structures such as pressure strips on the two second regions 2112 on both sides of the two electrode terminals 22 of the wall portion 211 during the subsequent assembly of the battery cells 20. This helps reduce the subsequent assembly difficulty of the battery cells 20 and enables the pressure strips and other structures to share space with the wall portion 211 in the first direction X, which helps optimize the spatial layout of the battery cells 20 during subsequent assembly.

[0219] According to some embodiments of this application, see Figure 7 and Figure 8 As shown, along the first direction X, the maximum distance between the first surface 2111a and the second surface 2112a is L, which satisfies 1.5mm≤L≤10mm.

[0220] Wherein, along the first direction X, the maximum distance between the first surface 2111a and the second surface 2112a is L, that is, in the first direction X, the depth of the recessed space 2114 formed by the wall portion 211 on the side of the second region 2112 facing the main body portion 231 from the first surface 2111a toward the direction away from the main body portion 231 is L.

[0221] For example, along the first direction X, the maximum distance L between the first surface 2111a and the second surface 2112a can be 1.5mm, 1.6mm, 1.7mm, 1.8mm, 1.9mm, 2mm, 2.2mm, 2.5mm, 2.8mm, 3mm, 3.2mm, 3.5mm, 3.8mm, 4mm, 4.2mm, 4.5mm, 4.8mm, 5mm, 5.2mm, 5.5mm, 5.8mm, 6mm, 6.2mm, 6.5mm, 6.8mm, 7mm, 7.2mm, 7.5mm, 7.8mm, 8mm, 8.2mm, 8.5mm, 8.8mm, 9mm, 9.2mm, 9.5mm, 9.8mm or 10mm, etc.

[0222] In this embodiment, by setting the maximum distance between the first surface 2111a of the first region 2111 and the second surface 2112a of the second region 2112 to 1.5mm to 10mm, the recessed depth of the recessed space 2114 of the wall portion 211 on the side of the second region 2112 facing the main body portion 231 is 1.5mm to 10mm. On the one hand, setting the recessed depth of the recessed space 2114 to be greater than or equal to 1.5mm can increase the space inside the outer casing 21 for accommodating the gas generated by the battery cell 20 during use, thereby alleviating the phenomenon of a sharp increase in the internal pressure of the battery cell 20 after the gas accumulates inside the outer casing 21. It also facilitates the recessed space 2114 to accommodate the adsorption member 24, which helps to reduce the assembly difficulty of the adsorption member 24. On the other hand, setting the recessed depth of the recessed space 2114 to be less than or equal to 10mm can reduce the molding difficulty of the wall portion 211 and effectively alleviate the phenomenon that the wall portion 211 occupies too much space in the first direction X due to the excessive depth of the recess, thereby optimizing the overall size of the battery cell 20.

[0223] In some embodiments, see Figure 8 As shown, along the first direction X, the maximum distance between the first surface 2111a and the second surface 2112a is L, which satisfies 2.5mm≤L≤6mm.

[0224] In this embodiment, by further setting the maximum distance between the first surface 2111a of the first region 2111 and the second surface 2112a of the second region 2112 to 2.5mm to 6mm, the recessed depth of the recessed space 2114 of the wall portion 211 on the side of the second region 2112 facing the main body portion 231 is 2.5mm to 6mm. On the one hand, setting the recessed depth of the recessed space 2114 to be greater than or equal to 2.5mm can further increase the space inside the outer shell 21 for accommodating the gas generated by the battery cell 20 during use, so as to further alleviate the phenomenon of the internal pressure of the battery cell 20 increasing sharply after the gas accumulates inside the outer shell 21, and it is also beneficial to further reduce the assembly difficulty of the adsorption member 24. On the other hand, setting the recessed depth of the recessed space 2114 to be less than or equal to 6mm can further reduce the molding difficulty of the wall portion 211, and can further alleviate the phenomenon that the wall portion 211 occupies too much space in the first direction X due to the excessive recessed depth of the wall portion 211, so as to further optimize the overall size of the battery cell 20.

[0225] According to some embodiments of this application, see Figure 5 and Figure 6As shown, electrode terminal 22 is disposed in the first region 2111. That is, electrode terminal 22 is mounted on the first region 2111 of the wall portion 211, and correspondingly, electrode lead-out hole 2111c is disposed in the first region 2111 of the wall portion 211, and electrode terminal 22 is disposed at electrode lead-out hole 2111c.

[0226] In this embodiment, by setting the electrode terminal 22 on the first region 2111 of the wall portion 211, it is convenient to electrically connect the electrode terminal 22 with the tab 232 of the electrode assembly 23, which helps to reduce the assembly difficulty between the electrode terminal 22 and the tab 232. On the other hand, it can increase the space inside the outer casing 21 for accommodating the gas generated by the battery cell 20 during use without excessively affecting the structural strength of the first region 2111 of the wall portion 211 for mounting the electrode terminal 22 and the spatial size of the wall portion 211 for mounting the electrode terminal 22. This can alleviate the phenomenon that the gas generated by the electrode assembly 23 with active metal during use accumulates inside the outer casing 21, causing a sharp increase in the internal pressure of the battery cell 20.

[0227] According to some embodiments of this application, in conjunction with Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the tab 232 protrudes from one end of the main body 231 facing the wall portion 211 in the first direction X, and the tab 232 is located on one side of the electrode terminal 22 in the second direction Y. Along the first direction X, at least a portion of the tab 232 is accommodated within the recessed space 2114.

[0228] Wherein, the second direction Y is the length direction of the battery cell 20, and correspondingly, the projection of the wall portion 211 in its thickness direction is rectangular, and the second direction Y is also the length direction of the wall portion 211.

[0229] The tab 232 is located on one side of the electrode terminal 22 in the second direction Y, that is, the tab 232 and the electrode terminal 22 are arranged along the second direction Y.

[0230] At least a portion of the tab 232 is accommodated within the recessed space 2114, that is, at least a portion of the tab 232 is a structure inserted into the recessed space 2114 along the first direction X, such that in the direction from the first surface 2111a of the first region 2111 to the third surface 2111b of the first region 2111, the tab 232 is a structure extending beyond the first surface 2111a of the first region 2111.

[0231] For example, in Figure 6In the middle, part of the tab 232 is inserted into the recessed space 2114 along the first direction X. Of course, in other embodiments, if the first surface 2111a of the first region 2111 and the end face of the main body 231 connected with the tab 232 are in abutting structure, the tab 232 can also be a structure in which the whole is located in the recessed space 2114.

[0232] It should be noted that in embodiments where a plurality of recessed spaces 2114 are formed on the side of the wall portion 211 facing the main body portion 231, and the electrode assembly 23 includes two tabs 232, the two tabs 232 can be a structure that is accommodated in the same recessed space 2114, or the two tabs 232 can be accommodated in different recessed spaces 2114 respectively.

[0233] It should be noted that in embodiments where at least a portion of the adsorption member 24 is accommodated within the recessed space 2114, the tab 232 and the adsorption member 24 can be accommodated in the same recessed space 2114, or they can be accommodated in different recessed spaces 2114.

[0234] In this embodiment, by setting at least a portion of the tab 232 to be accommodated in the recessed space 2114 along the first direction X, on the one hand, the wall portion 211 can reserve space for the tab 232, which helps to reduce the risk of short circuit caused by the wall portion 211 pressing down on the tab 232 and inserting the tab 232 into the main body portion 231, thereby improving the reliability of the battery cell 20. On the other hand, the tab 232 and the electrode terminal 22, as well as the tab 232 and the wall portion 211, can share space in the first direction X, which helps to improve the internal space utilization of the battery cell 20 and thus improve the energy density of the battery cell 20.

[0235] According to some embodiments of this application, in conjunction with Figure 5 , Figure 6 and Figure 7 As shown, the wall portion 211 may include at least two second regions 2112 arranged at intervals along the second direction Y. Along the first direction X, the tab 232 and the adsorption member 24 are respectively accommodated in different recessed spaces 2114.

[0236] In this embodiment, the wall portion 211 is formed with at least two second regions 2112 arranged at intervals along the second direction Y, such that at least two recessed spaces 2114 are formed on the side of the wall portion 211 facing the main body portion 231. By accommodating the tab 232 and the adsorption member 24 in different recessed spaces 2114 respectively, the interference between the tab 232 and the adsorption member 24 can be reduced, and the assembly difficulty of the tab 232 and the adsorption member 24 can be reduced.

[0237] According to some embodiments of this application, see Figure 5 and Figure 6 As shown, along the second direction Y, the tab 232 and the adsorption member 24 are located on both sides of the electrode terminal 22. That is, the tab 232 and the adsorption member 24 are structured to be separated by at least one electrode terminal 22 in the second direction Y.

[0238] It should be noted that in the embodiment where the battery cell 20 includes two electrode terminals 22 and the two electrode terminals 22 are spaced apart on the wall portion 211 along the second direction Y, the adsorption member 24 may be located between the two electrode terminals 22 in the second direction Y, and correspondingly, the tab 232 may be located on at least one side of the two electrode terminals 22 in the second direction Y. Alternatively, the tab 232 may be located between the two electrode terminals 22 in the second direction Y, and correspondingly, the adsorption member 24 may be located on at least one side of the two electrode terminals 22 in the second direction Y.

[0239] In this embodiment, by disposing the tab 232 and the adsorption member 24 on both sides of the electrode terminal 22 in the second direction Y, the electrode terminal 22 can separate the tab 232 and the adsorption member 24. On the one hand, this can further reduce the interference between the tab 232 and the adsorption member 24, and on the other hand, it can reduce the assembly difficulty between the tab 232 and the electrode terminal 22.

[0240] In some embodiments, combined with Figure 5 , Figure 6 , Figure 7 and Figure 8 As shown, the wall portion 211 may include two first regions 2111 and three second regions 2112, which are arranged alternately along the second direction Y. The battery cell 20 includes two electrode terminals 22 with opposite polarities, one electrode terminal 22 disposed in one first region 2111 and the other electrode terminal 22 disposed in the other first region 2111. Along the second direction Y, the adsorption member 24 is located between the two electrode terminals 22.

[0241] The adsorption member 24 is located between the two electrode terminals 22 in the second direction Y. Optionally, the adsorption member 24 disposed between the two electrode terminals 22 can be one or more. For example, in Figure 5 In this embodiment, two adsorption elements 24 are provided between the two electrode terminals 22, and the two adsorption elements 24 are arranged at intervals along the second direction Y. Of course, in other embodiments, the adsorption elements 24 provided between the two electrode terminals 22 can also be three, four or five, etc.

[0242] It should be noted that in the embodiment where the adsorption member 24 is located between the two electrode terminals 22 along the second direction Y, and the electrode assembly 23 includes two tabs 232, the two tabs 232 can be located on the same side of the two electrode terminals 22, that is, one electrode terminal 22, the adsorption member 24, the other electrode terminal 22, one tab 232, and the other tab 232 are arranged sequentially along the second direction Y. Of course, the two tabs 232 can also be located on opposite sides of the two electrode terminals 22. For example, in Figure 5 In the middle, the two tabs 232 are arranged at intervals along the second direction Y. Correspondingly, the two electrode terminals 22 are located between the two tabs 232 in the second direction Y, and the adsorption member 24 is located between the two electrode terminals 22 in the second direction Y.

[0243] In this embodiment, by setting the adsorption member 24 between the two electrode terminals 22 in the second direction Y, the tab 232 is positioned outside the two electrode terminals 22 in the second direction Y. The battery cell 20 with this structure can achieve separation between the two electrode terminals 22, which helps to reduce interference between the two electrode terminals 22, thereby reducing the assembly difficulty of the battery cell 20 and reducing the risk of short circuit between the two electrode terminals 22. On the other hand, it can reduce the assembly difficulty of the adsorption member 24 and can expand the size of the second region 2112 between the two electrode terminals 22 in the second direction Y according to the actual situation, so as to increase the size of the adsorption member 24.

[0244] Of course, the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures, for example, see reference. Figure 9 and Figure 10 As shown, Figure 9 This is a cross-sectional view of a battery cell 20 provided in some embodiments of this application. Figure 10 for Figure 9 A partial enlarged view of point C of the battery cell 20 shown. Along the second direction Y, the tab 232 is located between the two electrode terminals 22.

[0245] In this embodiment, the tab 232 is located between the two electrode terminals 22 in the second direction Y. In the embodiment where the electrode assembly 23 includes two tabs 232, both tabs 232 are located between the two electrode terminals 22 in the second direction Y, and the two tabs 232 are arranged at intervals along the second direction Y.

[0246] It should be noted that in embodiments where the tab 232 is located between two electrode terminals 22 along the second direction Y, and multiple adsorption elements 24 are disposed inside the battery cell 20, the multiple adsorption elements 24 can be a structure located on the same side of the two electrode terminals 22, that is, one electrode terminal 22, the tab 232, the other electrode terminal 22, and the multiple adsorption elements 24 are arranged sequentially along the second direction Y. Of course, the multiple adsorption elements 24 can also be a structure located on both sides of the two electrode terminals 22 respectively. For example, in Figure 5 In the battery cell 20, there are two adsorption members 24, and the two adsorption members 24 are arranged at intervals along the second direction Y. Correspondingly, two electrode terminals 22 are located between the two adsorption members 24 in the second direction Y, and the tabs 232 are located between the two electrode terminals 22 in the second direction Y.

[0247] In this embodiment, by setting the tab 232 between the two electrode terminals 22 in the second direction Y, the adsorption member 24 is positioned outside the two electrode terminals 22 in the second direction Y. The battery cell 20 with this structure can achieve separation between the two electrode terminals 22, which helps to reduce interference between the two electrode terminals 22, thereby reducing the assembly difficulty of the battery cell 20 and reducing the risk of short circuit between the two electrode terminals 22. On the other hand, it can reduce the assembly difficulty of the tab 232 and can expand the size of the second region 2112 between the two electrode terminals 22 in the second direction Y according to the actual situation, so as to adjust the position of the tab 232.

[0248] According to some embodiments of this application, refer to Figure 4 , Figure 5 and Figure 6 And further refer to Figure 11 , Figure 11 This is a cross-sectional view of a current collector 25 provided in some embodiments of this application. The battery cell 20 may also include the current collector 25. The current collector 25 includes a first connecting portion 251, a bent portion 252, and a second connecting portion 253 arranged and connected sequentially along a second direction Y. The first connecting portion 251 is connected to an electrode terminal 22, and the second connecting portion 253 is connected to a tab 232. Along the first direction X, the second connecting portion 253 is further away from the main body 231 than the first connecting portion 251, and at least a portion of the second connecting portion 253 is located within a recessed space 2114 accommodating the corresponding tab 232.

[0249] The first connecting portion 251 and the second connecting portion 253 of the current collector 25 are areas that are connected to the electrode terminal 22 and the tab 232 respectively, while the bending portion 252 is a bending structure connected between the first connecting portion 251 and the second connecting portion 253. That is, the first connecting portion 251 is connected to the second connecting portion 253 through the bending portion 252.

[0250] Along the first direction X, the second connecting portion 253 is further away from the main body portion 231 than the first connecting portion 251. That is, the first connecting portion 251 and the second connecting portion 253 of the current collecting member 25 are arranged at intervals along the first direction X, and the surface of the second connecting portion 253 facing the main body portion 231 is further away from the main body portion 231 than the surface of the first connecting portion 251 facing away from the main body portion 231.

[0251] At least a portion of the second connecting portion 253 is located within the recessed space 2114 that accommodates the corresponding tab 232. That is, the second connecting portion 253 of the current collector 25 and the tab 232 connected thereto are both structures that are at least partially accommodated in the same accommodating space. In other words, in the first direction X, at least a portion of the second connecting portion 253 is located between the second surface 2112a of the corresponding second region 2112 and the first surface 2111a of the first region 2111.

[0252] Optionally, the connection structure between the first connecting portion 251 and the electrode terminal 22 can be various, such as welding connection or abutment connection, etc. For example, in Figure 6 In this configuration, the first connecting portion 251 and the electrode terminal 22 are stacked along the first direction X and welded together, with the electrode terminal 22 located on the side of the first connecting portion 251 facing away from the main body portion 231 in the first direction X. Similarly, the connection structure between the second connecting portion 253 and the tab 232 can be various, such as welding or abutting. For example, in... Figure 6 In this structure, the second connecting portion 253 and the electrode tab 232 are stacked and welded together along the first direction X, and the electrode tab 232 is located on the side of the second connecting portion 253 facing the main body portion 231 in the first direction X. This is so that the electrode terminal 22 and the electrode tab 232 are located on both sides of the bent portion 252 in the second direction Y.

[0253] For example, in Figure 11In the current collector 25, the first connecting part 251, the bent part 252, and the second connecting part 253 are integrally formed. For example, the first connecting part 251, the bent part 252, and the second connecting part 253 of the current collector 25 can be made by integral forming processes such as stamping or casting. Of course, in other embodiments, the first connecting part 251, the bent part 252, and the second connecting part 253 of the current collector 25 can also be separate structures. Correspondingly, the bent part 252 can be connected between the first connecting part 251 and the second connecting part 253 by welding or other structures.

[0254] In this embodiment, the current collector 25 is provided with a first connecting portion 251, a bent portion 252, and a second connecting portion 253 arranged and connected sequentially along the second direction Y. The first connecting portion 251 and the second connecting portion 253 are respectively connected to the electrode terminal 22 and the electrode tab 232 to realize the electrical connection between the electrode assembly 23 and the electrode terminal 22. The second connecting portion 253 of the current collector 25 is configured to be further away from the main body portion 231 in the first direction X than the first connecting portion 251 of the current collector 25, and at least a portion of the second connecting portion 253 is located in the recessed space 2114 that accommodates the corresponding electrode tab 232, so that the electrode tab 232 and the corresponding connected second connecting portion 253 are connected in a way that makes the connection between the electrode assembly 23 and the electrode terminal 232 more secure. All 53 are structures that are at least partially accommodated within the recessed space 2114. The current collector 25 with this structure can achieve electrical connection between the electrode terminal 22 and the electrode tab 232 while the tab 232 is located on one side of the electrode terminal 22 in the second direction Y. This facilitates the connection between the current collector 25 and the electrode terminal 22 and the tab 232, which helps to reduce the assembly difficulty of the battery cell 20. On the other hand, it can enable the current collector 25 and the electrode terminal 22, as well as the current collector 25 and the wall portion 211, to share a portion of the space in the first direction X. This helps to optimize the internal layout of the battery cell 20 and improve the internal space utilization of the battery cell 20, thereby increasing the energy density of the battery cell 20.

[0255] In some embodiments, combined with Figure 6 and Figure 11 As shown, along the first direction X, the electrode 232 is located on the side of the second connecting portion 253 facing the main body portion 231. That is, the electrode 232 and the second connecting portion 253 are arranged along the first direction X, and the electrode 232 is connected to the surface of the second connecting portion 253 on the side facing the main body portion 231.

[0256] In this embodiment, by setting the tab 232 to a structure located on the side of the second connecting portion 253 of the current collector 25 facing the main body 231, the tab 232 is at least partially located within the space defined by the second connecting portion 253 and the bending portion 252. This facilitates the assembly and connection of the tab 232 and the second connecting portion 253, reducing the assembly difficulty between the tab 232 and the current collector 25. Furthermore, it enables the tab 232 and the bending portion 252 of the current collector 25 to share a space in the first direction X, which helps to improve the internal space utilization of the battery cell 20 and optimize the internal layout of the battery cell 20. It also reduces the risk of short circuit caused by the current collector 25 pressing down on the tab 232 and inserting it backwards into the main body 231, thereby improving the reliability of the battery cell 20.

[0257] In some embodiments, please continue to combine Figure 6 and Figure 11 As shown, along the first direction X, the electrode terminal 22 is located on the side of the first connection portion 251 that is away from the main body portion 231. That is, the electrode terminal 22 and the first connection portion 251 are arranged along the first direction X, and the electrode terminal 22 is connected to the surface of the first connection portion 251 on the side away from the main body portion 231.

[0258] In this embodiment, by setting the electrode terminal 22 to a structure located on the side of the first connecting portion 251 of the current collector 25 away from the main body portion 231, the electrode terminal 22 is at least partially located within the space defined by the first connecting portion 251 and the bending portion 252. On the one hand, this facilitates the assembly and connection of the electrode terminal 22 and the first connecting portion 251, which helps to reduce the assembly difficulty between the electrode terminal 22 and the current collector 25. On the other hand, it enables the electrode terminal 22 and the bending portion 252 of the current collector 25 to share a space in the first direction X, which helps to improve the internal space utilization of the battery cell 20 and optimize the internal layout of the battery cell 20.

[0259] According to some embodiments of this application, see Figure 5 and Figure 6 as well as Figure 9 and Figure 10 As shown, the battery cell 20 may further include an insulating member 27. The insulating member 27 is disposed between the wall portion 211 and the electrode assembly 23, and is configured to insulate and isolate the wall portion 211 and the electrode assembly 23. Along the first direction X, an adsorption member 24 is disposed between the wall portion 211 and the insulating member 27.

[0260] The insulating member 27 is disposed between the wall portion 211 and the electrode assembly 23 in the first direction X, so as to serve to insulate and isolate the wall portion 211 and the electrode assembly 23. The insulating member 27 can be made of various materials, such as rubber, plastic or silicone.

[0261] Along the first direction X, the adsorption member 24 is disposed between the wall portion 211 and the insulating member 27. That is, in the first direction X, the adsorption member 24 and the main body portion 231 of the electrode assembly 23 are respectively located on both sides of the insulating member 27, and the adsorption member 24 and the wall portion 211 are located on the same side of the insulating member 27.

[0262] In this embodiment, an insulating member 27 is also provided between the wall portion 211 and the electrode assembly 23, so that the insulating member 27 can insulate and isolate the wall portion 211 and the electrode assembly 23, which helps to reduce the risk of short circuit during the use of the battery cell 20. In particular, by placing the adsorption member 24 between the wall portion 211 and the insulating member 27, the insulating member 27 and the wall portion 211 can play a certain stabilizing role for the adsorption member 24, and the assembly difficulty is low and the operation is strong, which helps to reduce the assembly difficulty of the battery cell 20.

[0263] Of course, the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures, for example, see reference. Figure 12 and Figure 13 as well as Figure 14 and Figure 15 As shown, Figure 12 This is a cross-sectional view of a battery cell 20 provided in some embodiments of this application. Figure 13 for Figure 12 A magnified view of part D of the battery cell 20 shown. Figure 14 This is a cross-sectional view of a battery cell 20 provided in other embodiments of this application. Figure 15 for Figure 14 The image shows a partial enlarged view of point E of the battery cell 20. The battery cell 20 may also include an insulating member 27. The insulating member 27 is disposed between the wall portion 211 and the electrode assembly 23, and is configured to insulate and isolate the wall portion 211 and the electrode assembly 23. Along the first direction X, an adsorption member 24 is disposed between the main body portion 231 and the insulating member 27. That is, in the first direction X, the adsorption member 24 and the wall portion 211 are located on opposite sides of the insulating member 27, and the adsorption member 24 and the main body portion 231 of the electrode assembly 23 are located on the same side of the insulating member 27.

[0264] In this embodiment, by placing the adsorbent 24 between the insulating member 27 and the main body 231, the obstruction and blockage of the adsorbent 24 by the insulating member 27 can be reduced, which is beneficial to increasing the contact area between the adsorbent 24 and the gas inside the outer casing 21, thereby improving the adsorption effect of the adsorbent 24 on the hydrogen generated inside the battery cell 20 during the cycle.

[0265] According to some embodiments of this application, refer to Figure 5 and Figure 6 as well as Figure 9 and Figure 10 Please refer to further details. Figure 16 and Figure 17 , Figure 16 This is a schematic diagram of the structure of the insulating member 27 of the battery cell 20 provided in some embodiments of this application. Figure 17 This is a schematic diagram of the structure of the insulating member 27 of the battery cell 20 provided in some embodiments of this application. Along the first direction X, a receiving groove 271 is provided on the side of the insulating member 27 facing the adsorption member 24, and at least a portion of the adsorption member 24 is received in the receiving groove 271.

[0266] Among them, see Figure 16 and Figure 17 As shown, the insulating member 27 is also provided with a mounting hole 272. The mounting hole 272 penetrates the insulating member 27 along the first direction X, and the mounting hole 272 is provided in the first direction X corresponding to the electrode lead-out hole 2111c of the first region 2111, so that the electrode terminal 22 passes through the electrode lead-out hole 2111c and the mounting hole 272. In the embodiment where the battery cell 20 includes two electrode terminals 22 and the two electrode terminals 22 are spaced apart on the wall portion 211, the insulating member 27 is provided with two mounting holes 272. The two mounting holes 272 are arranged spaced apart along the second direction Y, and each mounting hole 272 is used for one electrode terminal 22 to pass through.

[0267] It should be noted that, in Figure 5 and Figure 6 In the middle, the adsorption member 24 is located between the two electrode terminals 22 in the second direction Y, correspondingly, see Figure 16 As shown, the receiving groove 271 on the insulating member 27 is located between the two mounting holes 272 in the second direction Y. For example, two adsorption members 24 are provided between the two electrode terminals 22, and correspondingly, the insulating member 27 is provided with two receiving grooves 271 between the two mounting holes 272.

[0268] It should be noted that, in Figure 9 and Figure 10 In this configuration, the adsorption element 24 is located on at least one side of the two electrode terminals 22, correspondingly, see [reference needed]. Figure 17 As shown, the insulating member 27 has a mounting groove on at least one side of the two mounting holes 272 in the second direction Y. For example, the battery cell 20 has two adsorption members 24, which are respectively located on both sides of the two electrode terminals 22 in the second direction Y, i.e., the two electrode terminals 22 are located between the two adsorption members 24 in the second direction Y. Correspondingly, the insulating member 27 has receiving grooves 271 on both sides of the two mounting holes 272, so that the two mounting holes 272 are located between the two receiving grooves 271 in the second direction Y.

[0269] In this embodiment, by providing a receiving groove 271 on the side of the insulating member 27 facing the adsorption member 24, and at least a portion of the adsorption member 24 being accommodated within the receiving groove 271, the insulating member 27 can provide a certain positioning and limiting effect on the adsorption member 24, which is beneficial to improving the assembly quality of the adsorption member 24 and reducing the risk of shaking or displacement of the adsorption member 24 during use. On the other hand, the insulating member 27 and the adsorption member 24 can share space in the first direction X, which is beneficial to improving the internal space utilization rate of the battery cell 20 and thus increasing the energy density of the battery cell 20.

[0270] In some embodiments, see Figure 16 and Figure 17 As shown, the bottom surface of the receiving groove 271 is provided with a through hole 273, which penetrates the insulating member 27 along the first direction X.

[0271] The through hole 273 is a structure provided on the bottom surface of the receiving groove 271, and the through hole 273 penetrates the bottom wall of the receiving groove 271 along the first direction X.

[0272] For example, a plurality of through holes 273 are provided on the bottom surface of the receiving groove 271, and at least a portion of the projection of the adsorption member 24 in the first direction X is located in the through hole 273, that is, in the first direction X, at least a portion of the adsorption member 24 is a structure corresponding to the through hole 273.

[0273] In this embodiment, by providing a through hole 273 on the bottom surface of the receiving groove 271 of the insulating member 27, and the through hole 273 having a structure that penetrates the insulating member 27 along the first direction X, the obstruction and blockage of the insulating member 27 on the adsorbent member 24 can be reduced. This is beneficial to further increase the contact area between the adsorbent member 24 and the gas inside the outer shell 21, thereby further improving the adsorption effect of the adsorbent member 24 on the hydrogen generated inside the battery cell 20 during the cycle, so as to further alleviate the phenomenon of a sharp increase in the internal pressure of the battery cell 20 after the gas accumulates inside the outer shell 21.

[0274] According to some embodiments of this application, see Figure 5 and Figure 6 , Figure 9 and Figure 10 , Figure 12 and Figure 13 as well as Figure 14 and Figure 15 As shown, along the first direction X, the insulating member 27 abuts against the main body portion 231 and the wall portion 211. That is, the insulating member 27 is disposed between the wall portion 211 and the main body portion 231 in the first direction X, and both the wall portion 211 and the main body portion 231 abut against the insulating member 27.

[0275] In this embodiment, by setting the insulating member 27 to abut against the main body 231 and the wall 211 in the first direction X, the stability and reliability of the insulating member 27 assembled in the housing 21 can be improved, which helps to reduce the risk of the insulating member 27 shaking or shifting during use. On the other hand, the tightness of the insulating member 27 assembled in the housing 21 can be improved, which helps to improve the utilization rate of the internal space of the battery cell 20, thereby improving the energy density of the battery cell 20.

[0276] According to some embodiments of this application, please refer to Figure 18 , Figure 18 The image shows a cross-sectional view of the wall portion 211 of the housing 21 of the battery cell 20 provided in some embodiments of this application in other embodiments. The structure of the wall portion 211 of the housing 21 of the battery cell 20 can also be various. For example, the wall portion 211 may include only one first region 2111, and the wall portion 211 may include two second regions 2112. The electrode terminal 22 is disposed in the first region 2111, and along the second direction Y, the first region 2111 is connected between the two second regions 2112.

[0277] Along the second direction Y, the first region 2111 is connected between two second regions 2112. That is, one second region 2112, the first region 2111 and the other second region 2112 are arranged in sequence along the second direction Y. Correspondingly, the wall portion 211 forms two connecting areas 2113. The two ends of the first region 2111 in the second direction Y are respectively connected to a second region 2112 through a connecting area 2113.

[0278] It should be noted that in the embodiment where the battery cell 20 includes two electrode terminals 22 and both electrode terminals 22 are disposed on the first region 2111 of the wall portion 211, the two electrode terminals 22 are mounted on the same first region 2111 and are spaced apart along the second direction Y. Correspondingly, the first region 2111 of the wall portion 211 is provided with two electrode lead-out holes 2111c, and the two electrode lead-out holes 2111c are spaced apart along the second direction Y.

[0279] In this embodiment, by setting a first region 2111 of the wall portion 211 as one, and connecting the first region 2111 between two second regions 2112 in the second direction Y, the two second regions 2112 are respectively located at both ends of the wall portion 211 in the second direction Y. The battery cell 20 with this structure is convenient for the molding of the wall portion 211, which helps to reduce the manufacturing difficulty of the wall portion 211 and reduces the difficulty of assembling the adsorption member 24 into the recessed space 2114. On the other hand, it can increase the size of the first region 2111 in the second direction Y, which helps to reduce the difficulty of assembling the electrode terminal 22 on the first region 2111.

[0280] Of course, in some embodiments, the wall portion 211 of the outer casing 21 can also be other structures, for example, referring to Figure 19 , Figure 19 The image shows a cross-sectional view of the wall portion 211 of the housing 21 of the battery cell 20 provided in some embodiments of this application, in other embodiments. The wall portion 211 may include two first regions 2111, and the battery cell 20 includes two electrode terminals 22, one electrode terminal 22 being disposed in one first region 2111 and the other electrode terminal 22 being disposed in the other first region 2111. A second region 2112 is connected between the two first regions 2111 along the second direction Y.

[0281] Along the second direction Y, a second region 2112 is connected between the two first regions 2111, that is, the wall portion 211 forms two first regions 2111 and at least one second region 2112, and the second region 2112 is connected between the two first regions 2111.

[0282] For example, in Figure 19 In this configuration, the wall portion 211 includes only one second region 2112, and the second region 2112 connects to the two first regions 2111 in the second direction Y. That is, the first region 2111, the second region 2112, and the other first region 2111 are arranged sequentially along the second direction Y. Correspondingly, the wall portion 211 forms two connecting areas 2113, and the two ends of the second region 2112 in the second direction Y are respectively connected to a first region 2111 through a connecting area 2113. Of course, in other embodiments, the end of a first region 2111 that is away from the other first region 2111 in the second direction Y may also be connected to the second region 2112.

[0283] The battery cell 20 includes two electrode terminals 22. One electrode terminal 22 is disposed in a first region 2111 and the other electrode terminal 22 is disposed in another first region 2111. That is, the two electrode terminals 22 of the battery cell 20 are respectively installed on the two first regions 2111 of the wall portion 211. Correspondingly, both first regions 2111 are provided with electrode lead-out holes 2111c.

[0284] In this embodiment, by setting two first regions 2111 of the wall portion 211, each electrode terminal 22 is disposed on one first region 2111, and a second region 2112 is connected between the two first regions 2111, so that a recessed space 2114 is formed between the two electrode terminals 22 on the side of the wall portion 211 facing the main body portion 231. The battery cell 20 with this structure can reduce the assembly interference between the two electrode terminals 22 and can realize that the two electrode terminals 22 of the battery cell 20 are assembled on the same side of the outer casing 21, which is beneficial to reduce the assembly difficulty of the battery cell 20. On the other hand, the size of the second region 2112 located between the two first regions 2111 in the second direction Y can be increased according to the actual situation, so as to increase the spatial size of the recessed space 2114.

[0285] In some embodiments, see Figure 7 As shown, along the second direction Y, each first region 2111 is connected to a second region 2112 at both ends. That is, each first region 2111 is a structure set between two corresponding second regions 2112.

[0286] For example, the wall portion 211 is formed with three second regions 2112, which are arranged at intervals along the second direction Y, and in the second direction Y, a first region 2111 is connected between each two adjacent second regions 2112.

[0287] In this embodiment, by providing a second region 2112 at both ends of each first region 2111, the wall portion 211 also forms a second region 2112 on the outer side of the two second regions 2112 along the second direction Y, thereby increasing the number of recessed spaces 2114 formed by the wall portion 211. This further expands the space inside the outer casing 21 for accommodating the gas generated by the battery cell 20 during use, thereby further alleviating the phenomenon of a sharp increase in the internal pressure of the battery cell 20 caused by the accumulation of gas generated by the electrode assembly 23 with active metal during use inside the outer casing 21. This further reduces the occurrence of bulging or deformation of the battery cell 20 during use, thereby further reducing the risk of connection failure or leakage of the outer casing 21 during use, which is beneficial to improving the service life and reliability of the battery cell 20.

[0288] According to some embodiments of this application, see Figure 3 , Figure 4 and Figure 7As shown, in the projection plane perpendicular to the first direction X, the orthographic projection of the wall portion 211 is rectangular, and the size of the orthographic projection of the wall portion 211 in the second direction Y is greater than the size of the orthographic projection of the wall portion 211 in the third direction Z. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other. That is, the first direction X is the thickness direction of the first region 2111 of the wall portion 211, and also the thickness direction of the second region 2112 of the wall portion 211; the second direction Y is the length direction of the wall portion 211; and the third direction Z is the width direction of the wall portion 211.

[0289] In this embodiment, the projection of the wall portion 211 in the first direction X is a rectangular structure, and in the projection plane perpendicular to the first direction X, the size of the orthographic projection of the wall portion 211 in the second direction Y is greater than the size of the orthographic projection of the wall portion 211 in the third direction Z, so that the arrangement direction of the first region 2111 and the second region 2112 of the wall portion 211 is the length direction of the wall portion 211, thereby facilitating the forming of the first region 2111 and the second region 2112 on the wall portion 211, which helps to reduce the manufacturing difficulty of the wall portion 211.

[0290] According to some embodiments of this application, see Figure 3 and Figure 4 As shown, the outer casing 21 may include a housing 212 and an end cap 213. The housing 212 includes an integrally formed side wall and a bottom wall. The side wall surrounds the bottom wall. Along the first direction X, one end of the side wall is connected to the bottom wall, and the other end forms an opening 2121. The side wall and the bottom wall together define a receiving cavity. At least a portion of the electrode assembly 23 is received in the receiving cavity. The end cap 213 closes the opening 2121 and is a wall portion 211.

[0291] The end cap 213 is a wall portion 211, that is, the end cap 213 has a first region 2111 and a second region 2112. Correspondingly, the adsorption member 24 is disposed between the end cap 213 and the main body portion 231 of the electrode assembly 23, and the end cap 213 has a recessed space 2114 on the side facing the main body portion 231 in the first direction X.

[0292] The shell 212 includes an integrally formed side wall and bottom wall. That is to say, the shell 212 is manufactured by an integral forming process, such as stamping, casting or extrusion molding, etc. In other words, the side wall and bottom wall of the shell 212 are an integral structure.

[0293] In this embodiment, by setting the wall portion 211 of the outer casing 21 as an end cap 213 for closing the opening 2121, the battery cell 20 with this structure is easy to process and form the first region 2111 and the second region 2112 on the wall portion 211, and it is easy to assemble the adsorption member 24 into the recessed space 2114 of the wall portion 211, thereby reducing the manufacturing difficulty of the battery cell 20 and improving the production efficiency of the battery cell 20.

[0294] It should be noted that the structure of the battery cell 20 is not limited to this. In some embodiments, the battery cell 20 can also have other structures. For example, the outer casing 21 can include a housing 212 and an end cap 213. The housing 212 includes an integrally formed side wall and a bottom wall. The side wall surrounds the bottom wall. Along the first direction X, one end of the side wall is connected to the bottom wall, and the other end forms an opening 2121. The side wall and the bottom wall together define a receiving cavity. At least a portion of the electrode assembly 23 is received in the receiving cavity. The end cap 213 closes the opening 2121. The bottom wall is a wall portion 211. That is, the wall portion 211 is the bottom wall of the housing 212 that is opposite to the end cap 213 in the first direction X. That is, the bottom wall of the housing 212 forms a first region 2111 and a second region 2112. Correspondingly, the adsorption member 24 is disposed between the bottom wall of the housing 212 and the main body portion 231 of the electrode assembly 23. The bottom wall of the housing 212 forms a recessed space 2114 on the side facing the main body portion 231 in the first direction X.

[0295] In this embodiment, by setting the wall portion 211 of the outer casing 21 as the bottom wall of the casing 212 opposite to the end cap 213 in the first direction X, the battery cell 20 with this structure can ensure that the area of ​​the outer casing 21 with electrode terminals 22 is far away from the end cap 213, and that there is no direct connection between the wall portion 211 and the end cap 213. This reduces the impact of the stress generated by the connection between the end cap 213 and the casing 212 on the first region 2111 and the second region 2112 of the wall portion 211, thereby reducing the risk of deformation, collapse or cracking of the wall portion 211 during use, and improving the service life and reliability of the battery cell 20.

[0296] According to some embodiments of this application, the active metal element includes at least one of lithium, sodium, potassium, zinc, or aluminum. That is, the battery cell 20 is at least one of a lithium metal battery, a sodium metal battery, a potassium metal battery, a zinc metal battery, or an aluminum metal battery.

[0297] In this embodiment, by setting the active metal of the negative electrode active material layer of the negative electrode sheet of the main body 231 to at least one of lithium, sodium, potassium, zinc or aluminum, it is beneficial to improve the reaction activity of the electrode assembly 23 during use, thereby improving the performance of the battery cell 20.

[0298] According to some embodiments of this application, the solvent for the electrolyte may include ether solvents, which may include at least one of 1,2-dimethoxypropane, dimethoxymethane, ethylene glycol dimethyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, pentaethylene glycol dimethyl ether, polyethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol diethyl ether, triethylene glycol diethyl ether, tetraethylene glycol diethyl ether, pentaethylene glycol diethyl ether, ethylene glycol dibutyl ether, diethylene glycol dibutyl ether, or 1,3-dioxane.

[0299] In this embodiment, the battery cell 20 with this structure can reduce the gas generated inside the battery cell 20 during the cycle, so as to further alleviate the phenomenon of a sharp increase in the internal pressure of the battery cell 20 after the gas accumulates inside the casing 21. This can further reduce the occurrence of bulging or deformation of the battery cell 20 during use, thereby further reducing the risk of connection failure or leakage of the casing 21 during use, which is conducive to further improving the service life and reliability of the battery cell 20.

[0300] According to some embodiments of this application, the solvent for the electrolyte may include ester solvents, which may include at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, or diethyl sulfone.

[0301] In this embodiment, the battery cell 20 with this structure can reduce the gas generated inside the battery cell 20 during the cycle, so as to further alleviate the phenomenon of a sharp increase in the internal pressure of the battery cell 20 after the gas accumulates inside the casing 21. This can further reduce the occurrence of bulging or deformation of the battery cell 20 during use, thereby further reducing the risk of connection failure or leakage of the casing 21 during use, which is conducive to further improving the service life and reliability of the battery cell 20.

[0302] According to some embodiments of this application, this application also provides a battery device 100, which includes a battery cell 20 of any of the above schemes.

[0303] Among them, see Figure 2 As shown, the battery device 100 may also include a housing 10, in which the battery cells 20 are housed.

[0304] In some embodiments, the housing 10 may include a first housing body 11 and a second housing body 12, the first housing body 11 and the second housing body 12 covering each other, the first housing body 11 and the second housing body 12 together defining an assembly space for accommodating the battery cell 20.

[0305] Optionally, the second box body 12 can be a hollow structure with one end open, and the first box body 11 can be a plate-like structure. The first box body 11 covers the open side of the second box body 12 so that the first box body 11 and the second box body 12 together define the assembly space; the first box body 11 and the second box body 12 can also be hollow structures with one side open, and the open side of the first box body 11 covers the open side of the second box body 12.

[0306] Of course, the box 10 formed by the first box body 11 and the second box body 12 can be of various shapes, such as a cylinder or a cuboid. For example, in... Figure 2 In the middle, box 10 has a rectangular structure.

[0307] Optionally, the battery cell 20 disposed within the housing 10 can be one or more. For example, in... Figure 2 In the battery device 100, multiple battery cells 20 are arranged inside the housing 10. The multiple battery cells 20 can be connected in series, parallel, or in a mixed manner. A mixed connection means that the multiple battery cells 20 are connected in both series and parallel. The multiple battery cells 20 can be directly connected in series, parallel, or in a mixed manner, and then the whole assembly of the multiple battery cells 20 is housed in the housing 10. Of course, the battery device 100 can also be formed by first connecting multiple battery cells 20 in series, parallel, or in a mixed manner to form a battery module, and then connecting multiple battery modules in series, parallel, or in a mixed manner to form a whole assembly, which is also housed in the housing 10.

[0308] The battery device 100 may also include other structures. For example, the battery device 100 may also include a busbar component that connects multiple battery cells 20 to achieve electrical connection between the multiple battery cells 20.

[0309] It should be noted that in some embodiments, the battery device 100 may not have a housing 10. The battery device 100 includes multiple battery cells 20, and the battery device 100 composed of multiple battery cells 20 can be directly mounted onto the electrical device to provide power to the electrical device through the multiple battery cells 20. That is, the housing 10 can be part of the electrical device. Taking a vehicle 1000 as an example, the housing 10 can be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 10 can be at least a part of the floor of the vehicle 1000, or a portion of the housing 10 can be at least a part of the crossbeams and longitudinal beams of the vehicle 1000.

[0310] According to some embodiments of this application, this application also provides an electrical device, which includes a battery cell 20 of any of the above schemes, and the battery cell 20 is used to provide electrical energy to the electrical device.

[0311] The electrical device can be any of the aforementioned devices or systems that utilize battery cells 20.

[0312] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0313] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: shell; Electrode terminals are disposed on the housing; An electrode assembly is housed within the housing. The electrode assembly includes a main body and a tab. The tab protrudes from one end of the main body and is electrically connected to an electrode terminal. The main body includes a negative electrode sheet. The negative electrode sheet includes a negative current collector and a negative active material layer disposed on at least one side of the negative current collector. The negative active material layer includes an elemental active metal. An electrolyte is contained within the outer casing, the electrolyte comprising an electrolyte salt and a solvent, the solvent comprising an ether solvent or an ester solvent; as well as An adsorption element is disposed within the outer casing, and the adsorption element includes a hydrogen adsorption material.

2. The battery cell according to claim 1, characterized in that, The outer shell has a wall portion, and the adsorption element is disposed between the wall portion and the main body portion; The wall portion includes a first region and a second region. The first region and the second region are both located on the same side of the main body in a first direction, and the first region and the second region are arranged along a second direction. Along the first direction, the first region has a first surface facing the main body, and the second region has a second surface facing the main body. The second surface is further away from the main body than the first surface. The wall portion forms a recessed space on the side of each second region facing the main body. At least a portion of the adsorption member is accommodated in the recessed space. The second direction is perpendicular to the first direction.

3. The battery cell according to claim 2, characterized in that, Along the first direction, the first region has a third surface facing away from the main body, and the second region has a fourth surface facing away from the main body; The fourth surface is further away from the main body in the first direction than the third surface, and the wall portion also includes a connecting area, through which the first region and the second region are connected.

4. The battery cell according to claim 3, characterized in that, Along the first direction, the second surface is further away from the main body than the third surface.

5. The battery cell according to claim 3, characterized in that, The electrode terminal is disposed in the first region, and in the first direction, the electrode terminal protrudes from the third surface in the direction from the first surface to the third surface.

6. The battery cell according to claim 5, characterized in that, In the first direction, the electrode terminal protrudes from the fourth surface in the direction from the first surface to the third surface.

7. The battery cell according to claim 5, characterized in that, The wall portion includes two first regions and three second regions, which are arranged alternately along the second direction. The battery cell includes two electrode terminals with opposite polarities, one electrode terminal being disposed in one first region and the other electrode terminal being disposed in the other first region. Wherein, along the first direction, the fourth surface of the second region located between the two electrode terminals is further away from the main body than the fourth surface of the second region located on both sides of the two electrode terminals.

8. The battery cell according to claim 2, characterized in that, Along the first direction, the maximum distance between the first surface and the second surface is L, which satisfies 1.5mm≤L≤10mm.

9. The battery cell according to claim 8, characterized in that, 2.5mm≤L≤6mm.

10. The battery cell according to any one of claims 2-9, characterized in that, The electrode terminals are disposed in the first region.

11. The battery cell according to claim 10, characterized in that, The electrode tab protrudes from one end of the main body facing the wall in the first direction, and the electrode tab is located on one side of the electrode terminal in the second direction; Wherein, along the first direction, at least a portion of the electrode tab is accommodated within the recessed space.

12. The battery cell according to claim 11, characterized in that, The wall portion includes at least two second regions spaced apart along the second direction; Along the first direction, the tabs and the adsorption element are respectively housed in different recessed spaces.

13. The battery cell according to claim 12, characterized in that, Along the second direction, the tab and the adsorption element are located on both sides of the electrode terminal, respectively.

14. The battery cell according to claim 13, characterized in that, The wall portion includes two first regions and three second regions, which are arranged alternately along the second direction. The battery cell includes two electrode terminals with opposite polarities, one electrode terminal being disposed in one first region and the other electrode terminal being disposed in the other first region. Wherein, along the second direction, the adsorption element is located between the two electrode terminals; or Along the second direction, the tab is located between the two electrode terminals.

15. The battery cell according to claim 11, characterized in that, The battery cell also includes: The current collector includes a first connecting part, a bent part, and a second connecting part arranged and connected in sequence along the second direction. The first connecting part is connected to the electrode terminal, and the second connecting part is connected to the electrode tab. Along the first direction, the second connecting portion is further away from the main body than the first connecting portion, and at least a portion of the second connecting portion is located within the recessed space that accommodates the corresponding tab.

16. The battery cell according to claim 15, characterized in that, Along the first direction, the electrode is located on the side of the second connecting portion facing the main body portion.

17. The battery cell according to claim 15, characterized in that, Along the first direction, the electrode terminal is located on the side of the first connection portion away from the main body portion.

18. The battery cell according to claim 2, characterized in that, The battery cell also includes: An insulating element is disposed between the wall portion and the electrode assembly, the insulating element being configured to provide insulation between the wall portion and the electrode assembly; Wherein, along the first direction, the adsorption element is disposed between the wall portion and the insulating element; or Along the first direction, the adsorption element is disposed between the main body and the insulating element.

19. The battery cell according to claim 18, characterized in that, Along the first direction, the insulating member has a receiving groove on the side facing the adsorption member, and at least a portion of the adsorption member is received in the receiving groove.

20. The battery cell according to claim 19, characterized in that, The bottom surface of the receiving groove is provided with a through hole, which penetrates the insulating component along the first direction.

21. The battery cell according to claim 18, characterized in that, Along the first direction, the insulating member abuts against the main body portion and the wall portion.

22. The battery cell according to claim 2, characterized in that, The wall portion includes only one first region, and the wall portion includes two second regions, with the electrode terminal disposed in the first region; Along the second direction, the first region connects the two second regions.

23. The battery cell according to claim 2, characterized in that, The wall portion includes two first regions, and the battery cell includes two electrode terminals, one electrode terminal being disposed in one first region and the other electrode terminal being disposed in the other first region; Along the second direction, the two first regions are connected by a second region.

24. The battery cell according to claim 23, characterized in that, Along the second direction, each of the first regions is connected to the second region at both ends.

25. The battery cell according to claim 2, characterized in that, In a projection plane perpendicular to the first direction, the orthographic projection of the wall portion is rectangular, and the size of the orthographic projection of the wall portion in the second direction is greater than the size of the orthographic projection of the wall portion in the third direction. The first direction, the second direction, and the third direction are perpendicular to each other.

26. The battery cell according to claim 2, characterized in that, The outer casing includes: The housing includes an integrally formed sidewall and a bottom wall, the sidewall surrounding the bottom wall, one end of the sidewall being connected to the bottom wall along the first direction, and the other end forming an opening, the sidewall and the bottom wall together defining a receiving cavity, in which at least a portion of the electrode assembly is received; End cap, to close the opening; Wherein, the end cap is the wall portion; or The bottom wall is the wall portion.

27. The battery cell according to claim 1, characterized in that, The active metal element includes lithium, sodium, potassium, zinc, or aluminum.

28. A battery device, characterized in that, Includes the battery cell as described in any one of claims 1-27.

29. An electrical appliance, characterized in that, Includes a battery cell as described in any one of claims 1-27, the battery cell being used to provide electrical energy.

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