Battery cells, battery packs, and electrical devices

Abstract

This application discloses a battery cell, a battery device, and an electrical device. The battery cell includes: a casing, an electrode assembly, an electrolyte, and a gas storage structure. The electrode assembly is housed within the casing, with a gap forming between the electrode assembly and the casing. The electrolyte is housed within the casing, with a portion of the electrolyte wetting the electrode assembly and a portion of the electrolyte housed within a part of the gap. The gas storage structure is housed within the casing, with at least a portion of the gas storage structure located in the remaining part of the gap, and at least a portion of the gas storage structure is a hydrogen storage metal. Thus, by using the gas storage structure to absorb hydrogen generated within the casing, the probability of valve opening is reduced, the battery cell's lifespan is extended, hydrogen emission is reduced, and safety is improved. Simultaneously, the absorption efficiency is improved, matching the hydrogen absorption rate with the hydrogen generation rate, thereby maintaining stable pressure within the casing, reducing the probability of a sharp increase in internal pressure, and maintaining internal pressure stability.

Description

Technical Field

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

[0002] In related technologies, during the use of a battery cell, the electrolyte is gradually consumed and gas is generated, which causes the internal pressure of the battery cell to rise. This can lead to the premature opening of the valve in the battery cell, reducing its service life. Summary of the Invention

[0003] This application aims to at least address one of the technical problems existing in the prior art. Therefore, one objective of this application is to provide a battery cell that can maintain stable internal pressure during use, thereby extending the battery cell's lifespan and improving safety.

[0004] This application further proposes a battery device using the aforementioned battery cells.

[0005] This application also proposes an electrical device having the above-mentioned battery device.

[0006] In a first aspect, this application provides a battery cell, comprising: a casing, an electrode assembly, an electrolyte, and a gas storage structure. The electrode assembly is housed within the casing, and a gap is formed between the electrode assembly and the casing. The electrolyte is housed within the casing, with a portion of the electrolyte wetting the electrode assembly and a portion of the electrolyte housed within a part of the gap. The gas storage structure is housed within the casing, with at least a portion of the gas storage structure located in the other part of the gap, and at least a portion of the gas storage structure is a hydrogen storage metal.

[0007] According to the embodiments of this application, the battery cell has a gas storage structure inside the casing, which can be located in another part of the gap. The gas storage structure absorbs the hydrogen generated inside the casing, thereby reducing the probability of valve opening, extending the battery cell's service life, reducing hydrogen emission, improving safety, and improving absorption efficiency. This allows the hydrogen absorption rate to match the hydrogen generation rate, so that the pressure inside the casing can remain stable, reducing the probability of a sharp increase in internal pressure and maintaining internal pressure stability.

[0008] According to some embodiments of this application, the housing includes a first wall and a second wall, which are disposed opposite to each other. The first wall supports an electrode assembly, and at least a portion of a gap is formed between the second wall and the electrode assembly. At least a portion of a gas storage structure is disposed between the electrode assembly and the second wall.

[0009] In the above technical solution, the first wall supports the electrode assembly and is opposite to the second wall, so that the electrolyte surface is located between the second wall and the first wall. The gas storage structure is further disposed adjacent to the second wall and is at least partially located between the electrolyte surface and the second wall. That is, the gas storage structure can be completely located between the electrolyte surface and the second wall, or partially located between the electrolyte surface and the second wall. The gas storage structure located between the electrolyte surface and the second wall has a larger contact area with hydrogen, which can improve the absorption efficiency of hydrogen generated inside the shell.

[0010] According to some embodiments of this application, a first insulating member is provided between the second wall and the electrode assembly, and a gas storage structure is disposed between the first insulating member and the second wall, and / or, the gas storage structure is disposed between the first insulating member and the electrode assembly.

[0011] In the above technical solution, the first insulating member is used for insulation protection between the electrode assembly and the second wall. A gas storage structure can be provided between the second wall and the first insulating member, or between the first insulating member and the electrode assembly, or on the side of the first insulating member facing the second wall and the side of the first insulating member facing the electrode assembly. This allows for more placement positions of the gas storage structure, enabling it to come into more full contact with the gas generated inside the casing, thereby improving the gas absorption effect and effectively maintaining the stability of the internal pressure of the casing. This reduces the probability of a sharp increase in the internal pressure of the casing and improves the stability and reliability of the battery cell.

[0012] According to some embodiments of this application, the second wall faces the side surface of the first insulator, and / or the side surface of the first insulator facing the second wall is connected to the gas storage structure, and / or the electrode assembly faces the side surface of the first insulator, and / or the side surface of the first insulator facing the electrode assembly is connected to the gas storage structure.

[0013] The above technical solution can increase the area of ​​the battery cell used to fix the gas storage structure, which can not only improve the fixation stability and reliability of the gas storage structure, but also reduce the difficulty of setting up the gas storage structure and improve the processing efficiency of the battery cell.

[0014] According to some embodiments of this application, a tab space is formed between the first insulating member and the electrode assembly, the tab space accommodates the tab, and at least a partial gas storage structure is provided in the tab space.

[0015] In the above technical solution, the gap space inside the shell can be fully utilized, which can not only improve the gas absorption capacity of the gas storage structure, but also limit the electrode assembly through the gas storage structure, thereby improving the fixation stability and reliability of the electrode assembly inside the shell.

[0016] According to some embodiments of this application, the electrode space includes: a folded electrode region for accommodating the electrode and a void region located around the folded electrode region, with at least a portion of the gas storage structure disposed in the folded electrode region and / or the void region.

[0017] In the above technical solution, the gas storage structure is positioned more rationally. On the one hand, it allows the gas storage structure to be located between the electrolyte surface and the second wall, enabling it to fully contact the gas generated inside the casing, thus improving absorption efficiency and effect. On the other hand, it fully utilizes the gap between the first insulating component and the electrode assembly, increasing space utilization. The larger overall volume of the gas storage structure results in stronger hydrogen absorption capacity, allowing it to absorb more hydrogen and better maintain the internal pressure stability of the casing. Furthermore, the gas storage structure, positioned within the gap area, provides auxiliary support for the electrode assembly, enhancing its stability within the casing and reducing the probability of movement. This also improves the safety and reliability of the battery cells. Since the electrode selection tab area has tabs, the gas storage structure, located within this area, not only supports and limits the electrode assembly but also shapes and limits the tabs, preventing them from inserting into the electrode and further improving the reliability and stability of the electrode assembly.

[0018] According to some embodiments of this application, a gas storage structure is provided in the gap between adjacent electrodes and / or in the gap between the electrodes and the outer shell within the electrode tab area.

[0019] According to some embodiments of this application, the first insulating member has a receiving cavity, which is open on one side facing the second wall and / or on the side facing the electrode assembly to receive the gas storage structure, and the receiving cavity is in communication with the gap.

[0020] In the above technical solution, under the premise of absorbing the gas generated inside the shell, the gas storage structure can be set in the accommodating cavity of the first insulating component. Setting the gas storage structure has less impact on the internal space of the shell and can also take into account the energy density.

[0021] According to some embodiments of this application, the first insulating member includes a limiting portion that protrudes toward the electrode assembly; a receiving cavity is formed in the limiting portion.

[0022] In the above technical solution, the gas storage structure is set inside the accommodating cavity. On the one hand, when setting the gas storage structure, there is no need to make major structural changes to the end cap, and the thickness of the end cap can remain unchanged to take into account the energy density of the battery cell. On the other hand, the gas storage structure can be fixed by using the accommodating cavity opened on the limiting part. The accommodating cavity can limit the gas storage structure to reduce the probability of the gas storage structure moving around. The gas storage structure is less affected by the fluctuation of the electrolyte level. The gas storage structure can always be located above the electrolyte level, so that the absorption effect of the gas storage structure is less affected by the fluctuation of the electrolyte and the maintenance effect of the internal pressure of the outer shell is better.

[0023] According to some embodiments of this application, the second wall is provided with an explosion-proof component, which is configured to break when the pressure inside the housing reaches a set condition to release the gas inside the housing. The first insulating component has a connecting portion for connecting the internal space of the housing with the explosion-proof component, and at least part of the gas storage structure is disposed in the connecting portion.

[0024] In the above technical solution, the explosion-proof component is constructed as an explosion-proof valve, which can be assembled to the second wall or integrally formed with the second wall. A connecting part is formed on the first insulating component. The connecting part is used to connect the internal space of the shell with the outside. Therefore, the gas inside the shell is suitable to enter the connecting part. The connecting part is provided with a corresponding gas storage structure, which can further increase the number of gas storage structures to improve the gas intake effect and improve the space utilization rate.

[0025] According to some embodiments of this application, the connecting portion is constructed as a connecting groove, which extends along the surface of the first insulating member facing the electrode assembly to the surface of the first insulating member facing away from the electrode assembly.

[0026] In the above technical solution, a gas storage structure can be further provided in the communicating groove defined by the first insulating member. The gas storage structure can be provided in the first insulating member to realize the absorption of gas inside the shell. Under the premise of maintaining the stability of the internal pressure, the internal space of the shell can be fully utilized to improve the gas absorption effect while taking into account the energy density of the battery cell.

[0027] According to some embodiments of this application, the gas storage structure includes: a covering shell and a gas storage material filled in the covering shell, at least part of which is a hydrogen storage metal, the gas storage material is configured as granular or powdered, the covering shell has vent holes formed thereon, and the vent hole diameter is smaller than the particle size of the gas storage material, the covering shell is connected to a second wall, a first insulating member or an electrode assembly.

[0028] In the above technical solution, by setting up a gas storage structure that is generally block-shaped or strip-shaped, the gas storage structure can be attached to the surface of the second wall, the surface of the first insulating component, and the surface of the electrode assembly, which can reduce the difficulty of setting up the gas storage structure.

[0029] According to some embodiments of this application, at least one side surface of the casing is provided with a connecting adhesive layer, which is connected to at least one of the following: the surface of the second wall facing the first insulator, the surface of the first insulator facing the second wall, the side surface of the first insulator facing the electrode assembly, and the side surface of the electrode assembly facing the second wall.

[0030] In the above technical solution, by setting up a gas storage structure that is generally block-shaped or strip-shaped, the gas storage structure can be attached to the surface of the second wall, the surface of the first insulating component, and the surface of the electrode assembly, which can reduce the difficulty of setting up the gas storage structure.

[0031] According to some embodiments of this application, the gas storage structure includes: a gas storage material, at least a portion of which is a hydrogen storage metal, the gas storage material being configured as granules or powder, and the gas storage material being coated on at least one of the following: the surface of the second wall facing the first insulator, the surface of the first insulator facing the second wall, the side surface of the first insulator facing the electrode assembly, and the side surface of the electrode assembly facing the second wall.

[0032] In the above technical solution, a gas storage structure can be directly coated on the electrode assembly, the first insulating component, or the second wall. The gas storage structure can be formed as a dense coating on at least one side surface of the second wall, the electrode assembly, or the first insulating component. This not only reduces the impact of the gas storage structure on the internal space of the casing and takes into account the energy density of the battery cell, but also allows for more sufficient contact between the gas storage structure and the gas inside the casing. This can also increase the total amount of gas absorbed and the gas absorption efficiency, which is beneficial for maintaining the internal pressure balance of the casing, reducing the probability of a sharp increase in internal pressure, and improving the reliability of the battery cell.

[0033] According to some embodiments of this application, the gas storage structure includes: a gas storage material, at least a portion of which is a hydrogen storage metal, the gas storage structure is constructed in sheet or block form, and the gas storage material is disposed on at least one of the following: the surface of the second wall facing the first insulator, the surface of the first insulator facing the second wall, the side surface of the first insulator facing the electrode assembly, and the side surface of the electrode assembly facing the second wall.

[0034] In the above technical solution, a receiving cavity can be formed on the first insulating component, and the gas storage structure with a block structure can be directly placed in the receiving cavity, while the gas storage structure with a sheet structure can be directly attached to the second wall, the first insulating component, or the electrode assembly. This reduces the difficulty of setting up the gas storage structure, improves assembly convenience, and facilitates the recovery of the gas storage structure.

[0035] According to some embodiments of this application, the first wall or the second wall is provided with electrode terminals, and the electrode assembly is provided with tabs on the side facing the electrode terminals, or the electrode assembly is provided with tabs on the side adjacent to the electrode terminals.

[0036] In the above technical solution, in the embodiment where the pole post is set on the first wall, the second wall and the electrode assembly are relatively flat, which can reduce the difficulty of setting up the gas storage structure. In the embodiment where the pole post is set on the second wall, a gas storage structure can be set in the electrode tab space, which can improve the gas absorption capacity and gas absorption efficiency of the gas storage structure.

[0037] According to some embodiments of this application, the second wall is provided with electrode terminals, the first insulating element is constructed of lower plastic, and the outer shell is a cylinder or prism.

[0038] In the above technical solution, more gas storage structures (in terms of volume and quantity) can be set in the lower plastic layer to improve gas absorption capacity, thereby improving the reliability of the battery cell.

[0039] According to some embodiments of this application, the first wall is provided with electrode terminals, the first insulating element is constructed as an insulating sheet, and the outer shell is a cylinder or prism.

[0040] In the above technical solution, by setting a gas storage structure in the gap between the insulating sheet and the second wall, and / or the gap between the second wall and the electrode assembly, the utilization rate of the internal space of the housing can be improved, and the gas absorption capacity of the gas storage structure can be improved.

[0041] According to some embodiments of this application, the outer shell is provided with a third wall, which is connected to the first wall and the second wall respectively. Electrode terminals are provided on the third wall, the first insulating element is constructed as an insulating sheet, and the outer shell is a prism.

[0042] In the above technical solution, a gas storage structure can be set on the side of the battery with the battery cell facing upward or on the large surface of the battery. This can improve the gas absorption capacity of the gas storage structure, make full use of the internal space of the casing, and limit the electrode components through the gas storage structure, thereby improving the reliability and stability of the battery cell.

[0043] According to some embodiments of this application, the outer casing is provided with a third wall, which is connected to the first wall and the second wall respectively, and at least part of the gas storage structure is disposed between the third wall and the electrode assembly.

[0044] In the above technical solution, while a gas storage structure is set between the second wall and the electrode assembly, a gas storage structure can also be set between the third wall and the electrode assembly. More gas storage structures can be set, thereby improving the gas intake effect and gas intake efficiency, and limiting the electrode assembly to improve the reliability and stability of the battery cell.

[0045] According to some embodiments of this application, a second insulating member is provided between the third wall and the electrode assembly, and a gas storage structure is disposed between the second insulating member and the third wall, and / or, the gas storage structure is disposed between the second insulating member and the electrode assembly.

[0046] In the above technical solution, the second insulating member is used for insulation protection between the electrode assembly and the third wall. A gas storage structure can be provided between the third wall and the second insulating member, or between the second insulating member and the electrode assembly, or on the side of the second insulating member facing the third wall and the side of the second insulating member facing the electrode assembly, so that there are more possible positions for the gas storage structure. The gas storage structure can come into more full contact with the gas generated inside the shell to improve the gas absorption effect.

[0047] According to some embodiments of this application, the third wall faces the side surface of the second insulator, and / or the side surface of the second insulator facing the third wall is connected to the gas storage structure, and / or the electrode assembly faces the side surface of the second insulator, and / or the side surface of the second insulator facing the electrode assembly is connected to the gas storage structure.

[0048] The above technical solution can increase the area of ​​the battery cell used to fix the gas storage structure, which can not only improve the fixation stability and reliability of the gas storage structure, but also reduce the difficulty of setting up the gas storage structure and improve the processing efficiency of the battery cell.

[0049] According to some embodiments of this application, the second insulating member has a receiving cavity, which is open on the side facing the third wall and / or on the side facing the electrode assembly to receive the gas storage structure, and the receiving cavity is in communication with the gap.

[0050] In the above technical solution, under the premise of absorbing the gas generated inside the shell, the gas storage structure can be set in the accommodating cavity of the second insulating component. The gas storage structure has less impact on the internal space of the shell and can also take into account the energy density.

[0051] According to some embodiments of this application, the second insulating member includes a limiting portion that protrudes toward the electrode assembly, and a receiving cavity is formed in the limiting portion.

[0052] In the above technical solution, on the one hand, while setting the gas storage structure, there is no need to make major structural changes to the end cap. The thickness of the end cap can remain unchanged to take into account the energy density of the battery cell. On the other hand, the gas storage structure can be fixed by using the accommodating cavity opened on the limiting part. The accommodating cavity can limit the gas storage structure to reduce the probability of the gas storage structure moving around. The gas storage structure is less affected by the fluctuation of the electrolyte level. The gas storage structure can always be located above the electrolyte level, so that the absorption effect of the gas storage structure is less affected by the fluctuation of the electrolyte and the maintenance effect of the internal pressure of the casing is better.

[0053] According to some embodiments of this application, a tab space is formed between the second insulating member and the electrode assembly, the tab space accommodates the tab, and at least a partial gas storage structure is provided in the tab space.

[0054] In the above technical solution, the gap space inside the shell can be fully utilized, which can not only improve the gas absorption capacity of the gas storage structure, but also limit the electrode assembly through the gas storage structure, thereby improving the fixation stability and reliability of the electrode assembly inside the shell.

[0055] According to some embodiments of this application, the electrode space includes: a folded electrode region for accommodating the electrode and a void region located around the folded electrode region, with at least a portion of the gas storage structure disposed in the void region.

[0056] In the above technical solution, the location of the gas storage structure is more reasonable. On the one hand, the gas storage structure can be located between the electrolyte surface and the third wall, so that the gas storage structure can fully contact the gas generated inside the shell, thereby improving the absorption efficiency and absorption effect. On the other hand, the gap between the second insulating component and the electrode assembly can be fully utilized to improve space utilization. The overall volume of the gas storage structure is larger, and the hydrogen absorption capacity is stronger. It can absorb more hydrogen, thereby making the gas storage structure better at maintaining the internal pressure stability of the shell.

[0057] According to some embodiments of this application, the gas storage structure located between the third wall and the electrode assembly is disposed adjacent to the second wall, and the maximum distance between the structure and the second wall is less than or equal to 5 mm.

[0058] In the above technical solution, the gas storage structure located between the third wall and the electrode assembly is arranged adjacent to the second wall, that is, above it, and the maximum distance between it and the second wall is less than or equal to 5mm, so as to ensure that the gas storage structure located between the third wall and the electrode assembly can be located above the electrolyte surface, thereby improving the gas absorption effect and gas absorption efficiency.

[0059] According to some embodiments of this application, the gas storage structure includes: a shell and a gas storage material filled in the shell, at least part of which is a hydrogen storage metal, the gas storage material is configured as granular or powdered, the shell has vent holes formed thereon, and the vent hole diameter is smaller than the particle size of the gas storage material, the shell is connected to a third wall, a second insulating member or an electrode assembly.

[0060] In the above technical solution, by setting up a gas storage structure that is generally block-shaped or strip-shaped, the gas storage structure can be attached to the surface of the third wall, the surface of the second insulating component, and the surface of the electrode assembly, which can reduce the difficulty of setting up the gas storage structure.

[0061] According to some embodiments of this application, at least one side surface of the casing is provided with a connecting adhesive layer, which is connected to at least one of the following: the surface of the third wall facing the second insulator, the surface of the second insulator facing the third wall, the side surface of the second insulator facing the electrode assembly, and the side surface of the electrode assembly facing the third wall.

[0062] The above technical solution can improve the connection strength of the gas storage structure inside the shell, reduce the risk of gas storage structure shifting, improve the fixed stability of the gas storage structure, ensure that the gas storage structure is always above the electrolyte surface, thereby improving the gas absorption effect, and can also improve the reliability and stability of the battery cell.

[0063] According to some embodiments of this application, the gas storage structure includes: a gas storage material, at least a portion of which is a hydrogen storage metal, the gas storage material being configured as granules or powder, and the gas storage material being coated on at least one of the following: the surface of the third wall facing the second insulator, the surface of the second insulator facing the third wall, the side surface of the second insulator facing the electrode assembly, and the side surface of the electrode assembly facing the third wall.

[0064] In the above technical solution, the gas storage structure can be directly coated on the electrode assembly, the second insulating component, or the third wall. The gas storage structure can be formed as a dense coating on at least one side surface of the third wall, the electrode assembly, or the second insulating component. Not only does setting up the gas storage structure have less impact on the internal space of the casing, but it can also take into account the energy density of the battery cell. Furthermore, the contact between the gas storage structure and the gas inside the casing can be more sufficient, which can also improve the total amount of gas absorbed and the gas absorption efficiency. This helps to maintain the internal pressure balance of the casing, reduce the probability of a sharp increase in internal pressure, and improve the reliability of the battery cell.

[0065] According to some embodiments of this application, the gas storage structure includes: a gas storage material, at least a portion of which is a hydrogen storage metal, the gas storage structure is constructed in sheet or block form, and the gas storage material is disposed on at least one of the following: the surface of the third wall facing the second insulator, the surface of the second insulator facing the third wall, the side surface of the second insulator facing the electrode assembly, and the side surface of the electrode assembly facing the third wall.

[0066] In the above technical solution, a receiving cavity can be opened on the second insulating member, and the gas storage structure with a block structure can be directly placed in the receiving cavity, while the gas storage structure with a sheet structure can be directly attached to the third wall, the second insulating member, or the electrode assembly. This can reduce the difficulty of setting up the gas storage structure, improve the convenience of assembly, and facilitate the recycling of the gas storage structure.

[0067] According to some embodiments of this application, the third wall is provided with electrode terminals, and the electrode assembly is provided with tabs on the side facing the electrode terminals, or the electrode assembly is provided with tabs on the side adjacent to the electrode terminals.

[0068] In the above technical solution, more gas storage structures can be set up to improve the gas absorption effect and enhance the reliability and stability of the battery cells.

[0069] According to some embodiments of this application, the third wall is provided with electrode terminals, the second insulating member is constructed of lower plastic, and the outer shell is a prism.

[0070] The above technical solution can make full use of the lower plastic space, reduce the difficulty of arranging the gas storage structure, and improve the air intake effect.

[0071] According to some embodiments of this application, electrode terminals are provided on the first wall and / or the second wall, the second insulating element is constructed as an insulating sheet, and the outer shell is a prism.

[0072] In the above technical solution, the utilization rate of other parts of the gap is higher, and more air storage structures can be set up to improve the air intake effect.

[0073] According to some embodiments of this application, the battery cell is configured as an alkali metal battery.

[0074] In the above technical solution, the battery cell is constructed as an alkali metal battery, which can improve the energy density of the battery cell. Furthermore, by adopting the above-mentioned gas storage structure, the generation of hydrogen in the battery cell can be reduced, thereby extending the life of the battery cell.

[0075] According to some embodiments of this application, the electrode assembly includes a negative electrode sheet, the negative electrode sheet includes a negative current collector and an active material layer disposed on at least one side of the negative current collector, the active material layer including an elemental active metal.

[0076] The above technical solution can reduce the generation of hydrogen in the battery cell, thereby extending the battery cell's lifespan.

[0077] According to some embodiments of this application, the active metal monomer includes at least one of lithium, sodium, potassium, zinc, or aluminum.

[0078] The above technical solution can reduce the generation of hydrogen in the battery cell, thereby extending the battery cell's lifespan.

[0079] According to some embodiments of this application, the electrolyte includes a solvent, which is configured as at least one of an ether solvent or an ester solvent.

[0080] The above technical solution can reduce the generation of hydrogen in the battery cell, thereby extending the battery cell's lifespan.

[0081] According to some embodiments of this application, the ether solvent 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.

[0082] The above technical solution can reduce the generation of hydrogen in the battery cell, thereby extending the battery cell's lifespan.

[0083] According to some embodiments of this application, the hydrogen storage metal includes zirconium alloys, magnesium alloys, titanium alloys, vanadium alloys, or La. x Ni y M z At least one of the following, wherein M includes at least one of Zr, Mn, Mg, Zn, Al, Ti, Fe, Cu, Co, Y, Ca or Bi, 0 < x ≤ 2, 0 ≤ y ≤ 7, 0 ≤ z ≤ 3.

[0084] The above technical solution can reduce the generation of hydrogen in the battery cell, thereby extending the battery cell's lifespan.

[0085] According to some embodiments of this application, M includes at least one of Al, Mn, Mg, Fe, Y or Bi, and 0.3≤x≤1, 1≤y≤5, 0≤z≤1;

[0086] Titanium alloys include at least one of TiNi, Ti2Ni, TiFe, or TiMn2;

[0087] Magnesium alloys include at least one of Mg2Ni, Mg2Cu, Mg2Co, Mg2Al, Mg2Cr, or Mg2Te;

[0088] Zirconium alloys include at least one of ZrV2, ZrCr2, or ZrMn2;

[0089] Vanadium alloys include V3TiNi 0.56 M1 m m = 0.046-0.24, M1 includes at least one of Al, Si, Fe, Cu or Zr.

[0090] The above technical solution can reduce the generation of hydrogen in the battery cell, thereby extending the battery cell's lifespan.

[0091] According to some embodiments of this application, hydrogen storage metals include LaNi. 3.5 M2 x1 M3 y1 M4 z1 Where x1 is 0.2-0.6, y1 is 0-1, z1 is 0.3-0.9, x1+y1+z1=1.5, M2 includes at least one of Mn or Fe, M3 includes at least one of Zr, Ti or Y, and M4 includes at least one of Al, Mg, Ca or Bi.

[0092] The above technical solution can reduce the generation of hydrogen in the battery cell, thereby extending the battery cell's lifespan.

[0093] According to some embodiments of this application, the hydrogen storage metal includes La. 0.5 Ni 4.5 Y 0.5 LaNi 3.5 Mn 0.2 YBi 0.3 LaNi 3.5 Mn 0.6 Y 0.4 Bi 0.5 LaNi 3.5 Mn 0.2 Y 0.4 Bi 0.9 LaTi 3.5 Fe 0.4 Zr 0.5 Bi 0.6 LaTi 3.5 Fe 0.4 Zr 0.5 Mg 0.6 LaNi 4.26 Al 0.08 Mg 0.16 Or La 0.43 Y 0.57 Ni 4.5 Al 0.08 Mn 0.3 At least one of them.

[0094] The above technical solution can reduce the generation of hydrogen in the battery cell, thereby extending the battery cell's lifespan.

[0095] Secondly, this application proposes a battery device, comprising: the battery cell described in the above embodiments.

[0096] Thirdly, this application provides an electrical device, including the battery device described in the above embodiments.

[0097] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0098] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0099] Figure 1 This is a schematic diagram of an electrical device according to an embodiment of this application;

[0100] Figure 2 This is a schematic diagram of a battery device according to an embodiment of this application;

[0101] Figure 3 This is a schematic diagram of a battery cell according to an embodiment of this application;

[0102] Figure 4 This is a schematic diagram showing the disassembled battery cell according to an embodiment of this application;

[0103] Figure 5 This is a schematic diagram of the end cap according to the first embodiment of this application;

[0104] Figure 6 This is a schematic diagram of a battery cell according to the first embodiment of this application;

[0105] Figure 7 This is a cross-sectional view of a single battery cell according to the first embodiment of this application from one angle;

[0106] Figure 8 This is a cross-sectional view of a battery cell according to the first embodiment of this application from another angle;

[0107] Figure 9 This is a cross-sectional view of a single battery cell according to the first embodiment of this application from another angle;

[0108] Figure 10 This is a schematic diagram of a battery cell according to the second embodiment of this application;

[0109] Figure 11 This is a cross-sectional view of a single battery cell according to the second embodiment of this application from one angle;

[0110] Figure 12 This is a schematic diagram of a battery cell according to the third embodiment of this application;

[0111] Figure 13 This is a cross-sectional view of a single battery cell according to the third embodiment of this application;

[0112] Figure 14 This is a schematic diagram of a battery cell according to the fourth embodiment of this application;

[0113] Figure 15 This is a cross-sectional view of a single battery cell according to the fourth embodiment of this application;

[0114] Figure 16 This is a schematic diagram of the end cap according to the fifth embodiment of this application;

[0115] Figure 17 This is a cross-sectional schematic diagram of the end cap according to the fifth embodiment of this application;

[0116] Figure 18 This is a schematic diagram of the end cap according to the sixth embodiment of this application;

[0117] Figure 19 This is a cross-sectional schematic diagram of the end cap according to the sixth embodiment of this application;

[0118] Figure 20 This is a schematic diagram of a battery cell according to the seventh embodiment of this application;

[0119] Figure 21 This is a schematic diagram of the end cap according to the eighth embodiment of this application;

[0120] Figure 22 This is a cross-sectional schematic diagram of the end cap according to the eighth embodiment of this application;

[0121] Figure 23 This is a schematic diagram of a gas storage structure according to an embodiment of this application;

[0122] Figure 24 This is a pressure-hydrogen content curve of the hydrogen storage alloy prepared in Example 1 of this application;

[0123] Figure 25 This is an ion-polished cross-sectional morphology image of the hydrogen storage alloy sheet prepared in Example 1 of this application;

[0124] Figure 26 This is an internal pressure-time curve of the battery in Embodiment 1 and Comparative Example 1 of this application.

[0125] Figure label:

[0126] 100 cells per battery

[0127] Outer shell 10, first wall 10a, second wall 10b, third wall 10c, end cap 11, housing 12, pole post 13, explosion-proof component 14.

[0128] Electrode assembly 20, electrode tab 21, side surface of electrode assembly 22, end face of electrode assembly 23, large surface of electrode assembly 24.

[0129] Gas storage structure 30, covering shell 31, gas storage material 32.

[0130] First insulating member 40a, second insulating member 40b, accommodating cavity 41, partition 411, limiting part 42.

[0131] Selective tab region a, void region b, gas channel c,

[0132] Battery unit 200, power supply unit 300, motor 400, controller 500, housing 600. Detailed Implementation

[0133] 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.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0140] In the description of this application, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or the first and second features being in contact through another feature between them.

[0141] In the description of this application, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicate that the first feature is at a higher horizontal level than the second feature.

[0142] In this application, "multiple" means two or more (including two).

[0143] A single battery cell can be a rechargeable battery. A rechargeable battery is a battery cell that can be recharged after it has been discharged, allowing the active materials to be activated and the cell to continue to be used.

[0144] 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 may form a battery array, and the multiple battery cells may be connected in series, parallel, or in a mixed configuration via a busbar.

[0145] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells, such as forming a battery array.

[0146] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0147] 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.

[0148] 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.

[0149] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0150] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0151] 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.

[0152] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0153] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0154] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical devices.

[0155] For ease of explanation, the following embodiments will use a vehicle as an example of an electrical device.

[0156] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. A battery device 200 is installed inside the vehicle, and the battery device 200 may be located at the bottom, front, or rear of the vehicle. The battery device 200 can be used to power the vehicle; for example, the battery device 200 can serve as the vehicle's operating power source.

[0157] The vehicle may also include a controller 500 and a motor 400. The controller 500 controls the battery device 200 to supply power to the motor 400, which serves as a load, for example, for the power needs of the vehicle during starting, navigation and driving.

[0158] In some embodiments of this application, the battery device 200 can not only serve as the operating power source for the vehicle, but also as the driving power source for the vehicle, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle.

[0159] Please refer to Figure 2 , Figure 2 This is an exploded view of a battery device 200 provided in some embodiments of this application. The battery device 200 includes a housing 600 for housing individual battery cells 100.

[0160] The housing 600 is a component that houses the individual battery cells 100. The housing 600 provides placement space for multiple battery cells 100 and can adopt various structures. In some embodiments, the housing 600 may include a tray and a cover, which overlap to define a placement space for accommodating the battery cells 100. The tray and cover can be of various shapes, such as cuboids, cylinders, etc. The tray can be a hollow structure open on one side, and the cover can also be a hollow structure open on one side, with the open side of the cover overlapping the open side of the tray, thus forming a housing 600 with placement space. Alternatively, the tray can be a hollow structure open on one side, and the cover can be a plate-like structure, overlapping the open side of the tray, thus forming a housing 600 with placement space. As an example, the battery cell 100 can be a cylindrical battery cell 100, a prismatic battery cell 100, or a battery cell 100 of other shapes (such as a pouch battery cell 100), and this application does not impose any particular limitations.

[0161] In the battery device 200, there can be one or more battery cells 100. If there are multiple battery cells 100, they can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 100 are connected in both series and parallel. Alternatively, multiple battery cells 100 can be first connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed manner to form a whole, which is then housed within the housing 600. Another option is that all battery cells 100 can be directly connected in series, parallel, or in a mixed manner, and then the whole consisting of all battery cells 100 is housed within the housing 600.

[0162] The battery cell 100 serves as the smallest energy unit of the battery device 200. The battery device 200 includes multiple battery cells 100. Each battery cell 100 includes a housing 10, an end cap 11, and an electrode assembly 20 disposed within the housing 10.

[0163] The battery cell 100 includes: a housing 10, an end cap 11, and an electrode assembly 20. The housing 10 is used to define an accommodating space with an installation opening. The housing 10 can be a pouch structure that wraps around the electrode assembly 20 for a pouch battery, or it can be constructed as a hard shell structure, with the electrode assembly 20 disposed therein.

[0164] For example, the housing 10 may include a base plate and a side plate. The side plate surrounds the periphery of the base plate and defines an accommodating space with a mounting opening. The electrode assembly 20 and other functional components may be disposed in the accommodating space. The end cap 11 covers the mounting opening of the housing 10 to isolate the internal environment of the battery cell 100 from the external environment. The shape of the end cap 11 is adapted to the shape of the housing 10. The end cap 11 may be supported by a material with a certain hardness and strength (such as aluminum alloy or carbon fiber plate). The end cap 11 can effectively protect the safety and reliability of the internal components of the housing 10 when squeezed or impacted.

[0165] In some embodiments, the end cap 11 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 100 reaches a threshold. The end cap 11 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this. In some embodiments, an insulating member may also be provided on the inner side of the end cap 11. The insulating member can be used to isolate the electrical connection components within the housing 10 from the end cap 11 to reduce the risk of short circuits. For example, the insulating member can be plastic, rubber, etc., and an insulating sheet can also be provided between the electrode assembly 20 and the housing 10 to achieve insulation protection.

[0166] The outer casing 10 is a component used to cooperate with the end cap 11 to form the internal environment of the battery cell 100, wherein the formed internal environment can accommodate the electrode assembly 20, electrolyte, and other components. The outer casing 10 and the end cap 11 can be independent components. A mounting opening can be provided on the outer casing 10, and the end cap 11 closes the opening at the mounting opening to form the internal environment of the battery cell 100. The outer casing 10 can be of various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the outer casing 10 can be determined according to the specific shape and size of the electrode assembly 20. The material of the outer casing 10 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose any special limitations on this.

[0167] Electrode assembly 20 is the component in the battery cell 100 where electrochemical reactions occur. The casing 10 may contain one or more electrode assemblies 20. The electrode assembly 20 is mainly formed by winding or stacking positive and negative electrode sheets, and typically a separator is provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the main body of the electrode assembly 20, while the portions of the positive and negative electrode sheets without active material each constitute a tab 21. The positive and negative tabs may be located together at one end of the main body or separately at both ends of the main body. During the charging and discharging process of the battery device 200, the positive and negative active materials react with the electrolyte, and the tabs 21 connect to the electrode terminals 13 to form a current loop.

[0168] In related technologies, some battery systems (such as alkali metal batteries) produce a large amount of gas and produce gas rapidly during long-term cycling and storage. A considerable proportion of the gas is flammable and explosive hydrogen. The safety risk of the battery cell 100 is high. Not only is the gas emitted flammable, but the internal pressure is also high, which can easily lead to premature valve opening. The gas produced by the battery cell 100 needs to be discharged or treated in a timely manner.

[0169] It should be noted that common alkali metal batteries (including but not limited to lithium metal batteries, sodium metal batteries, potassium metal batteries, zinc metal batteries, and aluminum metal batteries) exhibit very significant differences in gas production patterns (including gas production amount, gas composition, and gas production rate) compared to secondary alkali ion batteries (such as lithium ion batteries, sodium ion batteries, and sodium-lithium ion batteries) during long-term charge and discharge processes.

[0170] Specifically, during the cycling and storage of battery cell 100, the amount of gas produced within battery cell 100 can accumulate rapidly in a short period of time, compressing the internal residual space of battery cell 100, and even causing the gas to be unable to be released, directly triggering the explosion-proof valve. At the same time, the gas produced by alkali metal batteries is often accompanied by reactive gases such as hydrogen and oxygen.

[0171] Based on the technical drawbacks of alkali metal batteries, such as large and rapid gas production, a high proportion of chemically active hydrogen, and the high risk of gas production and direct emission, the battery cell 100 of this application further incorporates a gas storage structure 30 within the casing 10 to rapidly absorb the produced gas within the casing 10. This maintains stable internal pressure within the battery cell 100, reducing the probability of premature valve opening and extending the service life of the battery cell 100. Furthermore, it improves venting and reduces the amount of hydrogen directly emitted, thereby enhancing safety.

[0172] The following is for reference. Figures 1-26 This application describes a battery cell 100, a battery device 200, and an electrical device 300 according to embodiments thereof.

[0173] like Figure 3 and Figure 4 As shown, this application provides a battery cell 100, including: a casing 10, an electrode assembly 20, an electrolyte, and a gas storage structure 30. The electrode assembly 20 is housed within the casing 10, and a gap is formed between the electrode assembly 20 and the casing 10. The electrolyte is housed within the casing 10, with a portion of the electrolyte wetting the electrode assembly 20 and a portion of the electrolyte housed in a part of the gap. The gas storage structure 30 is housed within the casing 10, with at least a portion of the gas storage structure 30 located in the other part of the gap, and at least a portion of the gas storage structure 30 is a hydrogen storage metal.

[0174] The electrode assembly 20, electrolyte, and gas storage structure 30 are all disposed inside the outer casing 10. The electrolyte is filled inside the outer casing 10, and the gas storage structure 30 is used to absorb the gas (including but not limited to hydrogen) generated inside the outer casing 10.

[0175] Specifically, the internal space of the housing 10 is slightly larger than the size of the electrode assembly 20, so that after the electrode assembly 20 is assembled into the housing 10, a gap is formed between the housing 10 and the electrode assembly 20. The electrolyte is injected into the housing 10 and is suitable for wetting the electrode assembly 20 and filling at least part of the gap. The other part of the gap can be used to set the gas storage structure 30, so that the gas storage structure 30 can be set inside the housing 10 and can be separated from the electrolyte.

[0176] It should be noted that the outer casing 10 can be disposed inside the housing 600 of the battery device 200, and the electrolyte can be located below the outer casing 10 under the action of gravity. The upper part of the gap of the outer casing 10 can be used to accommodate the gas storage structure 30, and at least part of the gas storage structure 30 is a hydrogen storage metal, so that the gas storage structure 30 can absorb the hydrogen generated during the charging and discharging of the battery cell 100.

[0177] It is understood that other portions of the gap may include: a gap portion defined between the upper sidewall of the housing 10 and the upper side of the electrode assembly 20, and a gap portion defined between other sidewalls of the housing 10 on the periphery of the upper sidewall and other sidewalls of the electrode assembly 20 on the periphery of the upper sidewall and adjacent to a portion of the upper sidewall of the housing 10, the two gap portions collectively defining other portions of the gap.

[0178] For example, the housing 10 defines an accommodating space, the electrode assembly 20 is disposed within the accommodating space, the electrolyte is filled within the accommodating space and is suitable for wetting the electrode assembly 20, the gas storage structure 30 is disposed within the accommodating space, and the battery cell 100 is configured as an alkali metal battery. During the charging and discharging process, the electrolyte and the electrode assembly 20 react to generate a large amount of hydrogen gas, and the gas storage structure 30 can absorb the hydrogen gas to reduce gas accumulation inside the housing 10, thereby maintaining the pressure stability inside the housing 10, reducing the probability of the housing 10 bulging or premature valve opening, extending the service life of the battery cell 100, and reducing or even avoiding the emission of hydrogen gas to the outside, thereby improving the safety of the space where the battery cell 100 is located, and thus improving the safety of the battery cell 100 in use.

[0179] It should be noted that alkali metal batteries produce a large amount of gas and produce gas rapidly, which causes the pressure inside the casing 10 to rise rapidly in a short period of time. In this application, at least part of the gas storage structure 30 is located between the electrolyte surface and the top wall, which can improve the absorption efficiency of the gas storage structure 30 so that the absorption efficiency of the gas storage structure 30 can match the gas production rate, realize the immediate production and absorption of hydrogen inside the casing 10, and thus keep the pressure inside the casing 10 stable.

[0180] According to the embodiments of this application, the battery cell 100 has a gas storage structure 30 provided inside the outer casing 10, and the gas storage structure 30 can be located in another part of the gap. The gas storage structure 30 absorbs the hydrogen generated inside the outer casing 10, thereby reducing the probability of valve opening, extending the service life of the battery cell 100, reducing the amount of hydrogen emitted, improving safety, and improving absorption efficiency. This allows the hydrogen absorption rate to match the hydrogen generation rate, so that the pressure inside the outer casing 10 can be kept stable, reducing the probability of a sharp increase in pressure inside the outer casing 10 and maintaining internal pressure stability.

[0181] According to some embodiments of this application, the housing 10 includes a first wall 10a and a second wall 10b, the first wall 10a and the second wall 10b are disposed opposite to each other, the first wall 10a supports the electrode assembly 20, and at least a portion of the gap is formed between the second wall 10b and the electrode assembly 20, and at least a portion of the gas storage structure 30 is disposed between the electrode assembly 20 and the second wall 10b.

[0182] Specifically, the first wall 10a and the second wall 10b can be arranged opposite each other in the height direction, with the first wall 10a located below and adapted to carry and support the electrode assembly 20, while the second wall 10b is arranged opposite to the first wall 10a, and at least part of the gap is formed between the second wall 10b and the electrode assembly 20, and a gas storage structure 30 can be arranged in the gap between the second wall 10b and the electrode assembly 20.

[0183] Thus, the first wall 10a supports the electrode assembly 20 and is opposite to the second wall 10b, so that the electrolyte surface is located between the second wall 10b and the first wall 10a. The gas storage structure 30 is further disposed adjacent to the second wall 10b and is at least partially located between the electrolyte surface and the second wall 10b. That is, the gas storage structure 30 can be completely located between the electrolyte surface and the second wall 10b, or partially located between the electrolyte surface and the second wall 10b. The gas storage structure 30 located between the electrolyte surface and the second wall 10b has a larger contact area with hydrogen, which can improve the absorption efficiency of hydrogen generated inside the outer casing 10.

[0184] It is understood that the outer shell 10 can be a prism, such as a quadrangular prism or a hexagonal prism. The second wall 10b and the first wall 10a are relative concepts, meaning they are two opposing walls. These two walls can be defined by two opposing surfaces on the outer shell 10. For example, if the outer shell of the battery cell 100 is a quadrangular prism, the battery cell 100 includes a large surface area (the surface with the largest surface area), a battery end face (the surface from which the electrode terminals 13 are led), and a battery side face (the surface with a smaller surface area than the large surface area and adjacent to the battery end face and the large surface area). The two opposing large surface areas can be formed as the second wall 10b and the first wall 10a, respectively. The two opposing battery side faces can be formed as either the second wall 10b or the first wall 10a. The surfaces can be formed as a first wall 10a and a second wall 10b, respectively. That is, in the embodiment where the outer shell 10 of the battery cell 100 is a quadrangular prism, the battery cell 100 can be a square battery (i.e., the orthographic projection outline of the outer shell 10 is square), such as a conventional square battery (shortest length), a short-blade battery (length greater than a square battery but less than a long-blade battery), or a long-blade battery (longest length). The first wall 10a can be the large surface of the battery, the side surface of the battery, or the end surface of the battery. In the embodiment where the battery cell 100 is formed as a cylindrical battery, the first wall 10a can be the end surface or the side surface of the cylindrical battery. In the embodiment where the first wall 10a is the side surface of the cylindrical battery, the gas storage structure 20 can also be provided on the side surface, such as in the gap between the side surface of the outer shell 10 and the electrode assembly 20 to avoid the tabs 21, adapters, and other structures.

[0185] Similarly, it can be understood that the electrode assembly has a large electrode assembly surface 24, an electrode assembly end surface 23, and an electrode assembly side surface 22. The large electrode assembly surface 24 is opposite to the large battery surface, the electrode assembly side surface 22 is opposite to the battery side surface, and the electrode assembly end surface 23 is opposite to the battery end surface.

[0186] like Figure 5 , Figure 6 , Figure 7 , Figure 8 as well as Figure 9As shown, according to some embodiments of this application, a first insulating member 40a is provided between the second wall 10b and the electrode assembly 20, a gas storage structure 30 is disposed between the first insulating member 40a and the second wall 10b, and / or, the gas storage structure 30 is disposed between the first insulating member 40a and the electrode assembly 20.

[0187] Specifically, the first insulating member 40a is used for insulation protection between the electrode assembly 20 and the second wall 10b. A gas storage structure 30 can be provided between the second wall 10b and the first insulating member 40a, or between the first insulating member 40a and the electrode assembly 20, or on the side of the first insulating member 40a facing the second wall 10b and the side of the first insulating member 40a facing the electrode assembly 20. This allows for more placement positions of the gas storage structure 30, enabling it to come into more full contact with the gas generated inside the outer casing 10, thereby improving the gas absorption effect and effectively maintaining the internal pressure of the outer casing 10. This reduces the probability of a sharp increase in internal pressure and improves the stability and reliability of the battery cell 100.

[0188] It is understood that an insulating element can be provided between the electrode assembly 20 and the housing 10. The housing 10 may include a housing body and an end cap 11 covering the housing body. A lower plastic can be provided between the electrode assembly 20 and the end cap 11, and an insulating sheet can be provided between the electrode assembly 20 and the housing 12. In some embodiments, the end cap 11 of the battery cell 100 defines a second wall 10b, in which case the first insulating element 40a can be a lower plastic. In other embodiments, the housing 12 of the battery cell 100 defines a second wall 10b, in which case the first insulating element 40a can be an insulating sheet.

[0189] According to some embodiments of this application, the second wall 10b faces the side surface of the first insulating member 40a, and / or the side surface of the first insulating member 40a facing the second wall 10b is connected to the gas storage structure 30, and / or the electrode assembly 20 faces the side surface of the first insulating member 40a, and / or the side surface of the first insulating member 40a facing the electrode assembly 20 is connected to the gas storage structure 30.

[0190] For example, in embodiments where the gas storage structure 20 is disposed on the side surface of the second wall 10b facing the first insulating member 40a, or where the gas storage structure 20 is disposed on the side surface of the first insulating member 40a facing the second wall 10b, the influence of electrolyte level fluctuations on the gas storage structure 20 can be reduced. In embodiments where the gas storage structure 20 is disposed on the side surface of the first insulating member 40a facing the electrode assembly 20, or on the side surface of the first insulating member 40a facing the second wall 10b, the gas storage structure 20 can be assembled into the housing 10 simultaneously with the first insulating member 40a, which can reduce assembly difficulty. In embodiments where the gas storage structure 20 is disposed on the side surface of the electrode assembly 20 facing the first insulating member 40a, the electrode assembly 20 can be assembled simultaneously with the gas storage structure 20, which can also reduce assembly difficulty.

[0191] In other words, the gas storage structure 30 can be disposed on the second wall 10b, or on the side surface of the first insulating member 40a facing the second wall 10b, or on the side surface of the first insulating member 40a facing the electrode assembly 20, or on the side surface of the electrode assembly 20 facing the first insulating member 40a.

[0192] This allows for a larger area within the battery cell 100 used to fix the gas storage structure 30, which not only improves the stability and reliability of the gas storage structure 30 but also reduces the difficulty of setting up the gas storage structure 30 and increases the processing efficiency of the battery cell 100.

[0193] like Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, according to some embodiments of this application, a tab space is formed between the first insulating member 40a and the electrode assembly 20, the tab space accommodates the tab, and at least a partial gas storage structure 30 is provided in the tab space.

[0194] Among them, the surface of the first insulating member 40a facing the electrode assembly 20 forms an electrode space for accommodating the electrode tab 21 between the electrode assembly 20 and the electrode assembly 20, and at least a partial gas storage structure 30 is provided in the electrode space.

[0195] In other words, there is a gap between the first insulating member 40a and the electrode assembly 20, and this gap can define the tab space, in which at least a partial gas storage structure 30 can be provided.

[0196] In this way, the gap space inside the outer shell 10 can be fully utilized, which can not only improve the gas absorption capacity of the gas storage structure 30, but also limit the electrode assembly 20 through the gas storage structure 30, thereby improving the fixation stability and reliability of the electrode assembly 20 inside the outer shell 10.

[0197] In some embodiments, the tab space includes: a tab region a accommodating the tab 21 and a void region b located around the tab region a, wherein at least a portion of the gas storage structure 30 is disposed in the tab region a and / or the void region b.

[0198] In other words, in some embodiments, a gas storage structure 30 can be provided in the tab region a, and in other embodiments, a gas storage structure 30 can be provided in the gap region b. In a preferred embodiment, a gas storage structure 30 can be provided in both the tab region a and the gap region b.

[0199] It should be noted that the electrode assembly 20 includes one or more bare cells. The bare cells can be a wound structure (wound core) formed by stacking and winding positive electrode sheets, separator film and negative electrode sheets, or a stacked structure (stacked core) formed by stacking positive electrode sheets, separator film and negative electrode sheets, cutting and stacking them. The wound core or stacked core has tabs 21 leading out. The tabs 21 are connected to the electrode terminals 13 on the end cover 11. A lower plastic (i.e., the first insulating member 40a) can be provided between the electrode terminals 13 and the end cover 11. There is a gap between the lower plastic and the electrode assembly 20, and the tabs 21 are located in the gap. The corresponding gas storage structure 30 can also be provided in the gap and avoid the tabs 21.

[0200] For example, the gap between the lower plastic and the electrode assembly 20 can be divided into two parts, the first part being the part without the tab 21 (see...). Figure 6 and Figure 8 As shown, i.e., the void region b), the second part is the part with the tab 21 (see Figure 7 and Figure 9 As shown, the folded tab region a) and the gap region b can be filled with gas storage structure 30 in whole or in part. While setting gas storage structure 30 in folded tab region a, the tab 21 can be avoided.

[0201] In this way, the gas storage structure 30 is positioned more reasonably. On the one hand, it can be located between the electrolyte surface and the second wall 10b, so that the gas storage structure 30 can fully contact the gas generated inside the outer shell 10, thereby improving the absorption efficiency and absorption effect. On the other hand, it can make full use of the gap between the first insulating member 40a and the electrode assembly 20, thereby improving the space utilization rate. The overall volume of the gas storage structure 30 is larger, and the hydrogen absorption capacity is stronger, so that it can absorb more hydrogen and thus better maintain the stability of the internal pressure of the outer shell 10.

[0202] It should be pointed out that, as Figure 6 and Figure 8As shown, the gas storage structure 30 is disposed within the void region b, which can assist in supporting the electrode assembly 20, thereby increasing the stability of the electrode assembly 20 within the outer casing 10 and reducing the probability of movement. This also improves the safety and reliability of the battery cell 100. Figure 7 and Figure 9 As shown, the tab region a has a tab 21, and the gas storage structure 30 is set in the tab region a. While supporting and limiting the electrode assembly 20, it can also shape and limit the tab 21, which can prevent the tab 21 from being inserted into the electrode assembly 20, and further improve the reliability and stability of the electrode assembly 20.

[0203] Furthermore, within the tab region a, a gas storage structure 30 is provided in the gap between adjacent tabs 21, and / or in the gap between the tab 21 and the outer shell 20.

[0204] Specifically, the bare cell has a wound or stacked structure, and the tabs 21 of multiple positive electrode plates are connected to the positive terminal, and the tabs 21 of multiple negative electrode plates are connected to the negative terminal. There are gaps between the tabs 21 of multiple positive electrode plates and between the tabs 21 of multiple negative electrode plates. At least part of the gas storage structure 30 can be filled in these gaps. At the same time, there is also a gap between the tabs 21 and the outer casing 20, which can also be filled with the gas storage structure 30.

[0205] It is understandable that filling the gap between adjacent tabs 21 with a gas storage structure 30 can improve the air intake effect, support the tabs 21, reduce the deformation of the tabs 21, and improve the reliability and stability of the connection between the tabs 21 and the electrode terminal 13. Filling the gap between the tabs 21 and the outer shell 20 with a gas storage structure 30 can limit the tabs 21, reduce the movement of the tabs 21, and improve the reliability of the battery cell 100.

[0206] like Figure 5 As shown, according to some embodiments of this application, the first insulating member 40a has a receiving cavity 41, which is open on the side facing the second wall 10b and / or on the side facing the electrode assembly 20 to receive the gas storage structure 30, and the receiving cavity 41 is in communication with the gap.

[0207] In other words, the first insulating member 40a can be used to achieve insulation between the end cap 11 and the electrode assembly 20. The first insulating member 40a can generally be formed into a plate structure, and one or more accommodating cavities 41 can be opened on the plate, and the gas storage structure 30 is disposed in the accommodating cavity 41.

[0208] Therefore, under the premise of absorbing the gas generated inside the outer shell 10, the gas storage structure 30 can be set inside the accommodating cavity 41 of the first insulating member 40a. Setting the gas storage structure 30 has less impact on the internal space of the outer shell 10 and can also take into account the energy density.

[0209] The lower plastic is located between the second wall 10b and the electrode assembly 20, and a gas storage structure 30 can be provided between the outer shell 10 and the lower plastic, and a gas storage structure 30 can also be provided between the lower plastic and the electrode assembly 20.

[0210] In other words, in some embodiments, the gas storage structure 30 is disposed between the lower plastic and the outer shell 10, in other embodiments, the gas storage structure 30 is disposed between the lower plastic and the electrode assembly 20, and in preferred embodiments, the gas storage structure 30 can be disposed between the lower plastic and the outer shell 10 and between the lower plastic and the electrode assembly 20.

[0211] Therefore, in the embodiment where the end cap 11 defines the second wall 10b, the gas storage structure 30 is disposed between the lower plastic and the outer shell 10, and / or between the lower plastic and the electrode assembly 20. The placement of the gas storage structure 30 is more reasonable, allowing more gas storage structures 30 to be located between the electrolyte surface and the second wall 10b, thereby improving the hydrogen absorption efficiency.

[0212] like Figure 5 As shown, according to some embodiments of this application, the first insulating member 40a includes a limiting portion 42, which is located between the second wall 10b and the electrode assembly 20. The limiting portion 42 protrudes toward the electrode assembly 20 and pushes against the electrode assembly 20, and a receiving cavity is formed in the limiting portion 42.

[0213] That is, the lower plastic has a limiting part 42 for limiting the electrode assembly 20, and the limiting part 42 has a receiving cavity 41 on the side away from the electrode assembly 20, or the limiting part 42 has a receiving cavity 41 on the side facing the electrode assembly 20, and the gas storage structure 30 is disposed in the receiving cavity 41.

[0214] Specifically, the electrode assembly 20 has a positive electrode tab and a negative electrode tab, and the limiting part 42 on the lower plastic can include two limiting parts 42 located at both ends of the lower plastic. The multiple limiting parts 42 are used to press against and limit the electrode assembly 20, which can improve the fixing stability and reliability of the electrode assembly 20.

[0215] Furthermore, by setting the gas storage structure 30 within the accommodating cavity 41, on the one hand, there is no need to make major structural changes to the end cap 11 while setting the gas storage structure 30, and the thickness of the end cap 11 can remain unchanged to take into account the energy density of the battery cell 100. On the other hand, the gas storage structure 30 can be fixed by using the accommodating cavity 41 opened on the limiting part 42. The accommodating cavity 41 can limit the gas storage structure 30 to reduce the probability of the gas storage structure 30 shifting. The gas storage structure 30 is less affected by the fluctuation of the electrolyte level and can always be located above the electrolyte level, so that the absorption effect of the gas storage structure 30 is less affected by the fluctuation of the electrolyte and the effect of maintaining the internal pressure of the outer casing 10 is better.

[0216] Combination Figure 5 As shown, according to some embodiments of this application, the second wall 10b is provided with an explosion-proof element 14, which is configured to break when the pressure inside the housing 10 reaches a set condition to release the gas inside the housing 10. The first insulating element 40a has a connecting portion for connecting the internal space of the housing 10 with the explosion-proof element 14, and at least a portion of the gas storage structure 30 is disposed in the connecting portion.

[0217] Among them, the explosion-proof component 14 is constructed as an explosion-proof valve, which can be assembled to the second wall 10b or integrally formed with the second wall 10b. A connecting part is formed on the first insulating component 40a. The connecting part is used to connect the internal space of the outer shell 10 with the outside. Therefore, the gas inside the outer shell 10 is suitable to enter the connecting part. The connecting part is provided with a corresponding gas storage structure 20, which can further increase the number of gas storage structures 20 to improve the gas intake effect and improve the space utilization rate.

[0218] It is understood that in some embodiments, the connecting portion is constructed as a connecting groove c formed on the first insulating member 40a. The connecting groove c extends along the side surface of the first insulating member 40a facing the electrode assembly 20 to the side surface of the first insulating member 40a away from the electrode assembly 20. This allows the gas inside the housing 10 to be discharged through the connecting groove c and the opened explosion-proof member 14 when the internal pressure of the housing 10 exceeds the pressure threshold that the explosion-proof member 14 can withstand, thereby realizing the timely release of the battery cell 100 and improving the reliability of the battery device 200.

[0219] Furthermore, a gas storage structure 30 can be further provided in the communicating groove c defined by the first insulating member 40a. The gas storage structure 30 can be provided in the first insulating member 40a to achieve gas absorption inside the outer casing 10. Under the premise of maintaining stable internal pressure, the internal space of the outer casing 10 can be fully utilized to improve the gas absorption effect while taking into account the energy density of the battery cell 100.

[0220] like Figure 23As shown, according to some embodiments of this application, the gas storage structure 30 includes: a covering shell 31 and a gas storage material 32 filled in the covering shell 31. At least a portion of the gas storage material 32 is a hydrogen storage metal. The gas storage material 32 is configured as granules or powder. The covering shell 31 has vent holes formed on it, and the vent hole diameter is smaller than the particle size of the gas storage material 32. The covering shell 31 is connected to the second wall 10b, the first insulating member 40a, or the electrode assembly 20.

[0221] Specifically, in some embodiments, the gas storage structure 30 contains the gas storage material 32 through a covering shell 31 to form a block structure or a strip structure. The covering shell 31 has vent holes so that the gas generated inside the outer shell 10 can pass through the covering shell 31 and come into contact with the gas storage material 32 inside the covering shell 31 to achieve gas absorption inside the outer shell 10. Since the vent hole diameter is smaller than the particle size of the gas storage material 32, the probability of the gas storage material 32 falling out of the covering shell 31 can be reduced.

[0222] In this way, by setting up a gas storage structure 30 that is generally block-shaped or strip-shaped, the gas storage structure 30 can be attached to the surface of the second wall 10b, the surface of the first insulating member 40a and the surface of the electrode assembly 20, which can reduce the difficulty of setting up the gas storage structure 30.

[0223] According to some embodiments of this application, at least one side surface of the casing 31 is provided with a connecting adhesive layer, which is connected to at least one of the following: the surface of the second wall 10b facing the first insulator 40a, the surface of the first insulator 40a facing the second wall 10b, the side surface of the first insulator 40a facing the electrode assembly 20, and the side surface of the electrode assembly 20 facing the second wall 10b.

[0224] In other words, a bonding adhesive layer can be provided on the surface of the casing 31, and the bonding adhesive layer can be used to bond the surface of the first insulating member 40a, the second wall 10b, or the electrode assembly 20.

[0225] This can improve the connection strength of the gas storage structure 30 within the outer casing 10, reduce the risk of the gas storage structure 30 shifting, improve the stability of the gas storage structure 30, ensure that the gas storage structure 30 is always above the electrolyte surface, thereby improving the gas absorption effect, and also improve the reliability and stability of the battery cell 100.

[0226] Of course, the gas storage structure 30 of this application embodiment is not limited to this. In some other embodiments, the gas storage structure 30 may include: a gas storage material 32, at least a portion of which is a hydrogen storage metal. The gas storage material 32 is configured as granules or powder, and the gas storage material 32 is coated on at least one of the following: the surface of the second wall 10b facing the first insulating member 40a, the surface of the first insulating member 40a facing the second wall 10b, the side surface of the first insulating member 40a facing the electrode assembly 20, and the side surface of the electrode assembly 20 facing the second wall 10b.

[0227] Therefore, the gas storage structure 30 can be directly coated on the electrode assembly 20, the first insulating member 40a, or the second wall 10b. The gas storage structure 30 can be formed as a dense coating on at least one side surface of the second wall 10b, the electrode assembly 20, or the first insulating member 40a. Not only does setting the gas storage structure 30 have less impact on the internal space of the casing 10, and can take into account the energy density of the battery cell 100, but the contact between the gas storage structure 30 and the gas inside the casing 10 can also be more sufficient, which can also improve the total amount of gas absorbed and the gas absorption efficiency, which is conducive to maintaining the internal pressure balance of the casing 10, reducing the probability of a sharp increase in internal pressure, and improving the reliability of the battery cell 100.

[0228] In other embodiments, the gas storage structure 30 includes a gas storage material 32, at least a portion of which is a hydrogen storage metal. The gas storage structure 30 is constructed in a sheet or block shape, and the gas storage material is disposed on at least one of the following: the surface of the second wall 10b facing the first insulating member 40a, the surface of the first insulating member 40a facing the second wall 10b, the side surface of the first insulating member 40a facing the electrode assembly 20, and the side surface of the electrode assembly 20 facing the second wall 10b.

[0229] For example, a cavity may be formed on the first insulating member 40a, and the gas storage structure 30 with a block structure may be placed directly in the cavity, while the gas storage structure 30 with a sheet structure may be directly attached to the second wall 10b, the first insulating member 40a, or the electrode assembly 20.

[0230] This reduces the difficulty of setting up the gas storage structure 30, improves the ease of assembly, and facilitates the recovery of the gas storage structure 30.

[0231] It should be noted that during the charging and discharging process, the battery cell 100 will generate gases including hydrogen. Hydrogen is chemically active, so it is necessary to make at least part of the gas storage material 32 a hydrogen storage metal to achieve hydrogen absorption. In particular, for alkali metal batteries, the hydrogen production is relatively large, and setting a hydrogen storage metal significantly improves the voltage resistance of the battery cell 100.

[0232] According to some embodiments of this application, the first wall 10a or the second wall 10b is provided with electrode terminals 13, and the electrode assembly 20 is provided with tabs 21 on the side facing the electrode terminals 13, or the electrode assembly 20 is provided with tabs 21 on the side adjacent to the electrode terminals 13.

[0233] Specifically, in some embodiments, the first wall 10a is provided with electrode terminals 13, and the electrode assembly 20 may have tabs 21 led out on the side opposite to the first wall 10a, or on the side adjacent to the electrode terminal 13. In other embodiments, the second wall 10b is provided with electrode terminals 13, and the electrode assembly 20 may have tabs 21 led out on the side opposite to the second wall 10b, or on the side adjacent to the electrode terminal 13.

[0234] Thus, in the embodiment where the electrode terminal 13 is provided on the first wall 10a, the second wall 10b and the electrode assembly 20 are relatively flat, which can reduce the difficulty of setting up the gas storage structure 30. In the embodiment where the electrode terminal 13 is provided on the second wall 10b, the gas storage structure 30 can be set in the tab space, which can improve the gas absorption capacity and gas absorption efficiency of the gas storage structure 30.

[0235] It should be noted that the outer casing 10 of the battery cell 100 can be prism or cylinder. When the outer casing 10 is cylindrical, the battery cell 100 is a cylindrical battery. When the outer casing 10 is prism, the battery cell 100 can be a square battery, a short-blade battery, or a long-blade battery. The long-blade battery is longer, the short-blade battery is the next longer, and the square battery is the shortest.

[0236] According to some embodiments of this application, the second wall 10b is provided with electrode terminals 13, the first insulating member 40a is constructed of lower plastic, and the outer shell 10 is a cylinder or prism.

[0237] In other words, in the embodiment where the electrode terminal 13 is provided on the second wall 10b, the battery cell 100 of this application embodiment can be a cylindrical battery, a square battery, a short-blade battery or a long-blade battery. Correspondingly, the cylindrical battery is constructed in an upright state with the end cap 11 facing upwards, while the square battery, the short-blade battery or the long-blade battery has its outer shell 10 with the side shell 12 having the electrode terminal 13 or the end cap 11 having the electrode terminal 13 facing upwards.

[0238] For example, such as Figure 5 , Figure 6 , Figure 7 , Figure 8 as well as Figure 9As shown, in the first embodiment of this application, the battery cell 100 is constructed as a square battery. The end cap 11 of the battery cell 100 defines a second wall 10b. The first insulating member 40a is constructed as a lower plastic. Limiting portions 42 are provided at both ends of the lower plastic. The limiting portions 42 have accommodating cavities. A gas storage structure 30 is disposed in the accommodating cavity. The lower plastic also has a communicating groove c opposite to the explosion-proof member 14. A gas storage structure 30 is also disposed in the communicating groove c. A tab space is also formed between the lower plastic and the electrode assembly 20. A gas storage structure 30 is also disposed in the tab region a and the gap region b of the tab space. The gas storage structure 30 can be constructed as a block or a strip and disposed in the accommodating cavity 41, the tab region a, and the gap region b.

[0239] like Figure 16 , Figure 17 , Figure 18 and Figure 19 As shown, in the fifth and sixth embodiments of this application, the battery cell 100 is constructed as a blade battery or a short-blade battery. The end cap 11 of the battery cell 100 defines a second wall 10b. The first insulating member 40a is constructed as a lower plastic. Limiting portions 42 are provided at both ends of the lower plastic. The limiting portions 42 have receiving cavities. The gas storage structure 30 can be constructed as a block or a strip and is disposed in the receiving cavity 41.

[0240] like Figure 21 and Figure 22 As shown, in the seventh embodiment of this application, the battery cell 100 is constructed as a cylindrical battery, the end cap 11 of the battery cell 100 defines a second wall 10b, the first insulating member 40a is constructed as a lower plastic, the two ends of the lower plastic are provided with limiting portions 42, the limiting portions 42 have receiving cavities, and the gas storage structure 30 can be constructed as a block or a strip and is disposed in the receiving cavity 41.

[0241] Therefore, by setting more gas storage structures 30 (in terms of volume and quantity) in the lower plastic, the gas absorption capacity can be improved, thereby improving the reliability of the battery cell 100.

[0242] According to some embodiments of this application, the first wall 10a is provided with electrode terminals 13, the first insulating member 40a is constructed as an insulating sheet, and the outer shell 10 is a cylinder or prism.

[0243] In the embodiment where the electrode terminal 13 is provided on the first wall 10a, the battery cell 100 of this application embodiment can be a cylindrical battery, a square battery, a short-blade battery or a long-blade battery, and the first insulating member 40a can be constructed as an insulating sheet. Correspondingly, the cylindrical battery is constructed in an upright state with the surface of the housing 12 facing the end cap 11 facing upwards, while the square battery, short-blade battery or long-blade battery has its surface of the housing 12 facing the electrode terminal 13 facing upwards.

[0244] For example, such as Figure 14 and Figure 15 As shown, in the fourth embodiment of this application, the battery cell 100 is constructed as a square battery, and the end cap 11 or the housing 12 forms the sidewall facing the electrode terminal 13. A gas storage structure 30 is provided between the first insulating member 40a and the second wall 10b, which are constructed as insulating sheets, and between the first insulating member 40a and the electrode assembly 20. The gas storage structure 30 can be constructed as a strip and attached to the insulating sheet, or the gas storage structure 30 can be coated on the first insulating sheet.

[0245] In this way, by setting the gas storage structure 30 in the gap between the insulating sheet and the second wall 10b, and / or the gap between the second wall 10b and the electrode assembly 20, the utilization rate of the internal space of the housing 10 can be improved, and the gas absorption capacity of the gas storage structure 30 can be improved.

[0246] According to some embodiments of this application, the outer shell 10 is provided with a third wall 10c, which is connected to the first wall 10a and the second wall 10b respectively. Electrode terminals 13 are provided on the third wall 10c. The first insulating member 40a is constructed as an insulating sheet, and the outer shell 10 is a prism.

[0247] In one embodiment where the electrode terminal 13 is provided on the third wall 10c, the battery cell 100 of this application embodiment can be a square battery, a short-blade battery or a long-blade battery, and the first insulating member 40a can be constructed as an insulating sheet. For square batteries, short-blade batteries or long-blade batteries, the surface of the casing 12 adjacent to the electrode terminal 13 is facing upward, that is, the large surface of the battery or the side of the battery is facing upward.

[0248] For example, such as Figure 10 and Figure 11 As shown, in the second embodiment of this application, the battery cell 100 is constructed as a square battery with the large surface of the battery facing upward to define the second wall 10b. An insulating sheet is provided between the large surface of the battery and the electrode assembly 20. A gas storage structure 30 is provided on both the side of the insulating sheet facing the large surface of the battery and the side facing the electrode assembly 20. The gas storage structure 30 can be constructed as a strip and attached to the insulating sheet. The gas storage structure 30 can also be coated on the first insulating sheet.

[0249] like Figure 12 and Figure 13 As shown, in the third embodiment of this application, the battery cell 100 is constructed as a square battery, with the side of the battery facing upward to define the second wall 10b. An insulating sheet is provided between the side of the battery and the electrode assembly 20, and a gas storage structure 30 is provided on both the side of the insulating sheet facing the side of the battery and the side facing the electrode assembly 20. The gas storage structure 30 can be constructed as a strip and attached to the insulating sheet, or the gas storage structure 30 can be coated on the first insulating sheet.

[0250] like Figure 20As shown, in the fourth embodiment of this application, the battery cell 100 is constructed as a short-blade battery or a long-blade battery, with the large surface of the battery facing upward to define the second wall 10b. An insulating sheet is provided between the large surface of the battery and the electrode assembly 20, and a gas storage structure 30 is provided on both the side of the insulating sheet facing the large surface of the battery and the side facing the electrode assembly 20. The gas storage structure 30 can be constructed as a strip and attached to the insulating sheet, or the gas storage structure 30 can be coated on the first insulating sheet.

[0251] Therefore, a gas storage structure 30 can be provided on the side of the battery cell 100 facing upwards or on the large surface of the battery cell. This improves the gas absorption capacity of the gas storage structure 30, makes full use of the internal space of the outer casing 10, and limits the electrode assembly 20 through the gas storage structure 30, thereby improving the reliability and stability of the battery cell 100.

[0252] Second embodiment, such as Figure 10 and Figure 11 As shown, in the second embodiment, the battery cell 100 is constructed as a square battery, and the two large surfaces of the battery are respectively formed as a second wall 10b and a first wall 10a.

[0253] The housing 12 may include a first plate opposite to the end cap 11, a second plate located around the first plate and defining the large surface of the battery, a third plate defining the side surface of the battery, and a gas storage structure 30 may be provided between the second plate and the insulating sheet, and between the electrode assembly 20 and the insulating member.

[0254] Therefore, the gas storage structure 30 located between the insulating sheet and the second plate is less affected by fluctuations in the electrolyte surface, which can keep the absorption effect of the gas storage structure 30 stable. The gas storage structure 30 located between the insulating sheet and the electrode assembly 20 can not only absorb hydrogen, but also limit the position of the electrode assembly 20, reduce the shaking of the electrode assembly 20, and improve the reliability and stability of the electrode assembly 20. At the same time, the gas storage structure 30 located between the insulating sheet and the first side plate, or between the insulating sheet and the electrode assembly 20, can make full use of the internal space of the outer shell 10.

[0255] The third embodiment, such as Figure 12 and Figure 13 As shown, in the third embodiment, the battery cell 100 is constructed as a square battery, and the two battery sides are respectively formed as a second wall 10b and a first wall 10a.

[0256] The housing 12 may include a first plate opposite to the end cap 11, a second plate located around the first plate and defining the large surface of the battery, a third plate defining the side surface of the battery, and a gas storage structure 30 may be provided between the third plate and the insulating sheet, and between the electrode assembly 20 and the insulating member.

[0257] Therefore, the gas storage structure 30 located between the insulating sheet and the third plate is less affected by fluctuations in the electrolyte surface, which can keep the absorption effect of the gas storage structure 30 stable. The gas storage structure 30 located between the insulating sheet and the electrode assembly 20 can not only absorb hydrogen, but also limit the position of the electrode assembly 20, reduce the shaking of the electrode assembly 20, and improve the reliability and stability of the electrode assembly 20. At the same time, the gas storage structure 30 located between the insulating sheet and the third plate, or between the insulating sheet and the electrode assembly 20, can make full use of the internal space of the outer shell 10.

[0258] According to some embodiments of this application, the outer casing 10 is provided with a third wall 10c, which is connected to the first wall 10a and the second wall 10b respectively, and at least part of the gas storage structure 30 is disposed between the third wall 10c and the electrode assembly 20.

[0259] Specifically, the first wall 10a and the second wall 10b can be arranged opposite each other in the height direction, with the first wall 10a located below and suitable for carrying and supporting the electrode assembly 20. A third wall 10c is provided between the first wall 10a and the second wall 10b, and there is also a gap between the third wall 10c and the electrode assembly 20. This gap is also formed as at least part of the gap. A gas storage structure 30 can also be provided in the gap between the third wall 10c and the electrode assembly 20.

[0260] Therefore, while a gas storage structure 30 is provided between the second wall 10b and the electrode assembly 20, a gas storage structure 30 can also be provided between the third wall 10c and the electrode assembly 20. More gas storage structures 30 can be provided, thereby improving the gas intake effect and efficiency, and limiting the electrode assembly 20 to improve the reliability and stability of the battery cell 100.

[0261] like Figure 10 and Figure 12 As shown, according to some embodiments of this application, a second insulating member 40b is provided between the third wall 10c and the electrode assembly 20, a gas storage structure 30 is disposed between the second insulating member 40b and the third wall 10c, and / or the gas storage structure 30 is disposed between the second insulating member 40b and the electrode assembly 20.

[0262] Specifically, the second insulating member 40b is used for insulation protection between the electrode assembly 20 and the third wall 10c. A gas storage structure 30 can be provided between the third wall 10c and the second insulating member 40b, or between the second insulating member 40b and the electrode assembly 20, or on the side of the second insulating member 40b facing the third wall 10c and the side of the second insulating member 40b facing the electrode assembly 20, so that there are more possible positions for the gas storage structure 30. The gas storage structure 30 can come into more full contact with the gas generated inside the outer casing 10, so as to improve the gas absorption effect.

[0263] It is understood that an insulating element can be provided between the electrode assembly 20 and the housing 10. The housing 10 may include a housing body and an end cap 11 covering the housing body. A lower plastic can be provided between the electrode assembly 20 and the end cap 11, and an insulating sheet can be provided between the electrode assembly 20 and the housing 12. In some embodiments, the end cap 11 of the battery cell 100 defines a third wall 10c, in which case the second insulating element 40b can be a lower plastic. In other embodiments, the housing 12 of the battery cell 100 defines a third wall 10c, in which case the second insulating element 40b can be an insulating sheet.

[0264] According to some embodiments of this application, the third wall 10c faces the side surface of the second insulating member 40b, and / or the side surface of the second insulating member 40b facing the third wall 10c is connected to the gas storage structure 30, and / or the electrode assembly 20 faces the side surface of the second insulating member 40b, and / or the side surface of the second insulating member 40b facing the electrode assembly 20 is connected to the gas storage structure 30.

[0265] For example, in embodiments where the gas storage structure 20 is disposed on the side surface of the third wall 10c facing the second insulating member 40b, or where the gas storage structure 20 is disposed on the side surface of the second insulating member 40b facing the third wall 10c, the influence of electrolyte level fluctuations on the gas storage structure 20 can be reduced. In embodiments where the gas storage structure 20 is disposed on the side surface of the second insulating member 40b facing the electrode assembly 20, and on the side surface of the second insulating member 40b facing the third wall 10c, the gas storage structure 20 can be assembled into the housing 10 simultaneously with the second insulating member 40b, which can reduce assembly difficulty. In embodiments where the gas storage structure 20 is disposed on the side surface of the electrode assembly 20 facing the second insulating member 40b, the electrode assembly 20 can be assembled simultaneously with the gas storage structure 20, which can also reduce assembly difficulty.

[0266] In other words, the gas storage structure 30 can be disposed on the third wall 10c, or on the side surface of the second insulating member 40b facing the third wall 10c, or on the side surface of the second insulating member 40b facing the electrode assembly 20, or on the side surface of the electrode assembly 20 facing the second insulating member 40b.

[0267] This allows for a larger area within the battery cell 100 used to fix the gas storage structure 30, which not only improves the stability and reliability of the gas storage structure 30 but also reduces the difficulty of setting up the gas storage structure 30 and increases the processing efficiency of the battery cell 100.

[0268] According to some embodiments of this application, the second insulating member 40b has a receiving cavity 41, which is open on the side facing the third wall 10c and / or on the side facing the electrode assembly 20 to receive the gas storage structure 30, and the receiving cavity 41 is in communication with the gap.

[0269] In other words, the second insulating member 40b can be used to achieve insulation between the end cap 11 and the electrode assembly 20. The second insulating member 40b can generally be formed into a plate structure, and one or more accommodating cavities 41 can be opened on the plate, and the gas storage structure 30 is disposed in the accommodating cavity 41.

[0270] Therefore, under the premise of absorbing the gas generated inside the outer shell 10, the gas storage structure 30 can be set inside the accommodating cavity 41 of the second insulating member 40b. Setting the gas storage structure 30 has less impact on the internal space of the outer shell 10 and can also take into account the energy density.

[0271] The lower plastic is located between the third wall 10c and the electrode assembly 20, and a gas storage structure 30 can be provided between the outer shell 10 and the lower plastic, and a gas storage structure 30 can also be provided between the lower plastic and the electrode assembly 20.

[0272] In other words, in some embodiments, the gas storage structure 30 is disposed between the lower plastic and the outer shell 10, in other embodiments, the gas storage structure 30 is disposed between the lower plastic and the electrode assembly 20, and in preferred embodiments, the gas storage structure 30 can be disposed between the lower plastic and the outer shell 10 and between the lower plastic and the electrode assembly 20.

[0273] Therefore, in the embodiment where the end cap 11 defines the third wall 10c, the gas storage structure 30 is disposed between the lower plastic and the outer shell 10, and / or between the lower plastic and the electrode assembly 20. The placement of the gas storage structure 30 is more reasonable, allowing more gas storage structures 30 to be located between the electrolyte surface and the second wall 10b, thereby improving the hydrogen absorption efficiency.

[0274] According to some embodiments of this application, the second insulating member 40b includes a limiting portion 42, which is located between the third wall 10c and the electrode assembly 20. The limiting portion 42 protrudes toward the electrode assembly 20 and pushes against the electrode assembly 20; a receiving cavity 41 is formed in the limiting portion 42.

[0275] That is, the lower plastic has a limiting part 42 for limiting the electrode assembly 20, and the limiting part 42 has a receiving cavity 41 on the side away from the electrode assembly 20, or the limiting part 42 has a receiving cavity 41 on the side facing the electrode assembly 20, and the gas storage structure 30 is disposed in the receiving cavity 41.

[0276] Specifically, the electrode assembly 20 has a positive electrode tab and a negative electrode tab, and the limiting part 42 on the lower plastic can include two limiting parts 42 located at both ends of the lower plastic. The multiple limiting parts 42 are used to press against and limit the electrode assembly 20, which can improve the fixing stability and reliability of the electrode assembly 20.

[0277] Furthermore, by setting the gas storage structure 30 within the accommodating cavity 41, on the one hand, there is no need to make major structural changes to the end cap 11 while setting the gas storage structure 30, and the thickness of the end cap 11 can remain unchanged to take into account the energy density of the battery cell 100. On the other hand, the gas storage structure 30 can be fixed by using the accommodating cavity 41 opened on the limiting part 42. The accommodating cavity 41 can limit the gas storage structure 30 to reduce the probability of the gas storage structure 30 shifting. The gas storage structure 30 is less affected by the fluctuation of the electrolyte level and can always be located above the electrolyte level, so that the absorption effect of the gas storage structure 30 is less affected by the fluctuation of the electrolyte and the effect of maintaining the internal pressure of the outer casing 10 is better.

[0278] According to some embodiments of this application, a tab space is formed between the second insulating member 40b and the electrode assembly 20, the tab space accommodates the tab 21, and at least a partial gas storage structure 30 is provided in the tab space.

[0279] Among them, the second insulating member 40b forms an electrode space for accommodating the electrode tab 21 between its side surface facing the electrode assembly 20 and the electrode assembly 20, and at least a partial gas storage structure 30 is provided in the electrode space.

[0280] In other words, there is a gap between the second insulating member 40b and the electrode assembly 20, and this gap can define the tab space, in which at least a partial gas storage structure 30 can be provided.

[0281] In this way, the gap space inside the outer shell 10 can be fully utilized, which can not only improve the gas absorption capacity of the gas storage structure 30, but also limit the electrode assembly 20 through the gas storage structure 30, thereby improving the fixation stability and reliability of the electrode assembly 20 inside the outer shell 10.

[0282] According to some embodiments of this application, the electrode space includes: a folded electrode region a that accommodates the electrode 21 and a void region b located around the folded electrode region a, with at least a portion of the gas storage structure 30 disposed in the void region b.

[0283] It should be noted that the tab 21 is connected to the electrode terminal 13 on the end cover 11. A lower plastic (i.e., the second insulating part 40b) can be provided between the electrode terminal 13 and the end cover 11. There is a gap between the lower plastic and the electrode assembly 20, and the tab 21 is located in the gap. The corresponding gas storage structure 30 can also be provided in the gap, while avoiding the tab 21.

[0284] For example, the gap between the lower plastic and the electrode assembly 20 can be divided into two parts: the first part is the part without the tab 21, and the second part is the part with the tab 21. The gap region b can be filled with the gas storage structure 30 in whole or in part, while the tab region a is located below the electrolyte surface, so the tab region a is not provided with the gas storage structure 30.

[0285] In this way, the gas storage structure 30 is positioned more reasonably. On the one hand, it can be located between the electrolyte surface and the third wall 10c, so that the gas storage structure 30 can fully contact the gas generated inside the outer shell 10, thereby improving the absorption efficiency and absorption effect. On the other hand, it can make full use of the gap between the second insulating member 40b and the electrode assembly 20, thereby improving the space utilization rate. The overall volume of the gas storage structure 30 is larger, and its hydrogen absorption capacity is stronger, allowing it to absorb more hydrogen and thus better maintain the stability of the internal pressure of the outer shell 10.

[0286] It should be noted that the gas storage structure 30 located between the third wall 10c and the electrode assembly 20 is disposed adjacent to the second wall 10b, and the maximum distance between it and the second wall 10b is less than or equal to 5mm.

[0287] Specifically, a gap is formed between the electrode assembly 20 and the housing 10, and a portion of the gap is used to contain the electrolyte. The other portion of the gap includes: a first other portion defined by the second wall 10b and the area opposite to the electrode assembly 20, and a second other portion defined by the electrode assembly 20 and the third wall 10c. The second other portion is the portion defined by the third wall 10c and the electrode assembly 20, which is located side-up in the placement direction and above the electrolyte based on the placement direction of the battery cell 100.

[0288] Therefore, the gas storage structure 30 located between the third wall 10c and the electrode assembly 20 is positioned adjacent to the second wall 10b, i.e., above it, and the maximum distance between it and the second wall 10b is less than or equal to 5mm, so as to ensure that the gas storage structure 30 located between the third wall 10c and the electrode assembly 20 can be positioned above the electrolyte surface, thereby improving the gas intake effect and gas intake efficiency.

[0289] For example, such as Figure 10 and Figure 12 As shown, the gas storage structure 30 is disposed between the third wall 10c and the electrode assembly 20, adjacent to the second wall 10b, and the maximum distance L1 between the structure and the second wall 10b is less than or equal to 5mm.

[0290] like Figure 10As shown, in the second embodiment, the large surface of the battery defines the second wall 10b, the end face of the battery defines the third wall 10c, and the second insulating member 40b is a lower plastic. The maximum distance between the gas storage structure 30 disposed on the lower plastic near the second wall 10b and the second wall 10b can be 1mm, 2mm, 3mm, 4mm, 5mm, etc. With this arrangement, when the electrolyte is not fluctuating, the gas storage structure 30 can be entirely or at least partially located above the electrolyte surface. When the electrolyte surface fluctuates, the gas storage structure 30 is less affected by the fluctuation, and a larger portion of the gas storage structure 30 can be located above the electrolyte surface to ensure a stable and reliable hydrogen absorption effect.

[0291] like Figure 12 As shown, in the third embodiment, a second wall 10b is defined on the side of the battery, a third wall 10c is defined on the end face of the battery, and the second insulating member 40b is a lower plastic. The maximum distance between the gas storage structure 30 disposed on the lower plastic near the second wall 10b and the second wall 10b can be 1mm, 2mm, 3mm, 4mm, 5mm, etc. With this configuration, when the electrolyte is not fluctuating, the gas storage structure 30 can be entirely or at least partially located above the electrolyte surface. When the electrolyte surface fluctuates, the gas storage structure 30 is less affected by the fluctuation, and a larger portion of the gas storage structure 30 can be located above the electrolyte surface to ensure a stable and reliable hydrogen absorption effect.

[0292] like Figure 23 As shown, according to some embodiments of this application, the gas storage structure 30 includes: a covering shell 31 and a gas storage material 32 filled in the covering shell 31. At least a portion of the gas storage material 32 is a hydrogen storage metal. The gas storage material 32 is configured as granules or powder. The covering shell 31 has vent holes formed on it, and the vent hole diameter is smaller than the particle size of the gas storage material 32. The covering shell 31 is connected to the third wall 10c, the second insulating member 40b, or the electrode assembly 20.

[0293] Specifically, in some embodiments, the gas storage structure 30 contains the gas storage material 32 through a covering shell 31 to form a block structure or a strip structure. The covering shell 31 has vent holes so that the gas generated inside the outer shell 10 can pass through the covering shell 31 and come into contact with the gas storage material 32 inside the covering shell 31 to achieve gas absorption inside the outer shell 10. Since the vent hole diameter is smaller than the particle size of the gas storage material 32, the probability of the gas storage material 32 falling out of the covering shell 31 can be reduced.

[0294] In this way, by setting up a gas storage structure 30 that is generally block-shaped or strip-shaped, the gas storage structure 30 can be attached to the surface of the third wall 10c, the surface of the second insulating member 40b, and the surface of the electrode assembly 20, which can reduce the difficulty of setting up the gas storage structure 30.

[0295] According to some embodiments of this application, at least one side surface of the casing 31 is provided with a connecting adhesive layer, which is connected to at least one of the following: the surface of the third wall 10c facing the second insulator 40b, the surface of the second insulator 40b facing the third wall 10c, the side surface of the second insulator 40b facing the electrode assembly 20, and the side surface of the electrode assembly 20 facing the third wall 10c.

[0296] In other words, a bonding adhesive layer can be provided on the surface of the casing 31, and the bonding adhesive layer can be used to bond the surface of the second insulating member 40b, the third wall 10c, or the electrode assembly 20.

[0297] This can improve the connection strength of the gas storage structure 30 within the outer casing 10, reduce the risk of the gas storage structure 30 shifting, improve the stability of the gas storage structure 30, ensure that the gas storage structure 30 is always above the electrolyte surface, thereby improving the gas absorption effect, and also improve the reliability and stability of the battery cell 100.

[0298] Of course, the gas storage structure 30 of this application embodiment is not limited to this. In some other embodiments, the gas storage structure 30 includes: a gas storage material 32, at least a portion of which is a hydrogen storage metal. The gas storage material 32 is configured as granules or powder, and the gas storage material 32 is coated on at least one of the following: the surface of the third wall 10c facing the second insulating member 40b, the surface of the second insulating member 40b facing the third wall 10c, the side surface of the second insulating member 40b facing the electrode assembly 20, and the side surface of the electrode assembly 20 facing the third wall 10c.

[0299] Therefore, the gas storage structure 30 can be directly coated on the electrode assembly 20, the second insulating member 40b, or the third wall 10c. The gas storage structure 30 can be formed as a dense coating on at least one side surface of the third wall 10c, the electrode assembly 20, or the second insulating member 40b. Not only does setting the gas storage structure 30 have less impact on the internal space of the casing 10, and can take into account the energy density of the battery cell 100, but the contact between the gas storage structure 30 and the gas inside the casing 10 can also be more sufficient, which can also improve the total amount of gas absorbed and the gas absorption efficiency, which is conducive to maintaining the internal pressure balance of the casing 10, reducing the probability of a sharp increase in internal pressure, and improving the reliability of the battery cell 100.

[0300] In other embodiments, the gas storage structure 30 includes a gas storage material 32, at least a portion of which is a hydrogen storage metal. The gas storage structure 30 is configured as a sheet or a block, and the gas storage material is disposed on at least one of the following: the surface of the third wall 10c facing the second insulating member 40b, the surface of the second insulating member 40b facing the third wall 10c, the side surface of the second insulating member 40b facing the electrode assembly 20, and the side surface of the electrode assembly 20 facing the third wall 10c.

[0301] The second insulating member 40b may have a receiving cavity, and the gas storage structure 30 with a block structure can be directly placed in the receiving cavity. The gas storage structure 30 with a sheet structure can be directly attached to the third wall 10c, the second insulating member 40b, or the electrode assembly 20. This can reduce the difficulty of setting up the gas storage structure 30, improve the convenience of assembly, and facilitate the recycling of the gas storage structure 30.

[0302] According to some embodiments of this application, the third wall 10c is provided with an electrode terminal 13, and the electrode assembly 20 is provided with an electrode tab 21 on the side facing the electrode terminal 13, or the electrode assembly 20 is provided with an electrode tab 21 on the side adjacent to the electrode terminal 13.

[0303] Specifically, the third wall 10c is provided with electrode terminals 13, and the electrode assembly 20 can lead out tabs 21 on the side opposite to the first wall 10a, or on the side of the electrode assembly 20 adjacent to the electrode terminals 13.

[0304] Thus, in the embodiment where the battery cell 100 is placed on its side, a gas storage structure 30 can be set in the blank area of ​​the tab space, which can improve the gas absorption capacity and gas absorption efficiency of the gas storage structure 30.

[0305] It should be noted that when the battery cell 100 is constructed as a cylindrical battery, if the battery cell 100 is sideways, a gas storage structure 30 can be provided in the limiting portion 42 located above the electrolyte inside the end cap 11. An installation mark should be provided on the end cap 11 for installation based on the mark. In embodiments where the battery cell 100 is constructed as a square battery, a short-blade battery, or a long-blade battery, and in embodiments where the second insulating member 40b is constructed as a lower plastic, a baffle 411 can be provided in the limiting portion 42 at the end of the lower plastic facing the second wall 10b. For example, if the battery surface is facing upwards, the baffle 411 can extend along the length of the lower plastic. There can be multiple baffles 411, which define multiple... A gas storage structure 30 can be provided in the cavity defined by the baffle 411 that is less than 5 mm away from the second wall 10b. When the side of the battery is facing upward, the baffle 411 can extend along the width direction of the lower plastic. There can be multiple baffles 411, which define multiple cavities. The gas storage structure 30 can be provided in the cavity defined by the baffle 411 that is less than 5 mm away from the second wall 10b. In the embodiment where the second insulating member 40b is constructed as an insulating sheet, the gas storage structure 30 can be provided at the end of the insulating sheet adjacent to the second wall 10b, and the gas storage structure 30 is located in the area where the distance between the insulating sheet and the second wall 10b is 5 mm.

[0306] According to some embodiments of this application, the third wall 10c is provided with electrode terminals 13, the second insulating member 40b is constructed of lower plastic, and the outer shell 10 is a prism.

[0307] In other words, in the embodiment where the electrode terminal 13 is provided on the third wall 10c, the battery cell 100 of this application embodiment can be a square battery, a short-blade battery or a long-blade battery, with the large surface or side of the battery facing upwards.

[0308] For example, such as Figure 10 As shown, in the second embodiment of this application, the battery cell 100 is constructed as a square battery. The end cap 11 of the battery cell 100 defines a third wall 10c. The second insulating member 40b is constructed as a lower plastic. Limiting portions 42 are provided at both ends of the lower plastic. A gas storage structure 30 is provided in the limiting portion 42 adjacent to the second wall 10b. The gas storage structure 30 is a block-shaped member. The large surface of the battery defines the second wall 10b. The first insulating member 40a between the second wall 10b and the electrode assembly 20 is constructed as an insulating sheet. A gas storage structure 30 is provided between the insulating sheet and the second wall 10b, and between the insulating sheet and the electrode assembly 20. The gas storage structure 30 is either strip-shaped and attached or coated on the insulating sheet.

[0309] This allows for the installation of more gas storage structures 30, thereby improving the gas intake effect and enhancing the reliability and stability of the battery cell 100.

[0310] like Figure 12As shown, in the third embodiment of this application, the battery cell 100 is constructed as a square battery. The end cap 11 of the battery cell 100 defines a third wall 10c. The second insulating member 40b is constructed as a lower plastic. Limiting portions 42 are provided at both ends of the lower plastic. A gas storage structure 30 is provided in the limiting portion 42 adjacent to the second wall 10b. The gas storage structure 30 is a block-shaped member. The side of the battery defines the second wall 10b. The first insulating member 40a between the second wall 10b and the electrode assembly 20 is constructed as an insulating sheet. A gas storage structure 30 is provided between the insulating sheet and the second wall 10b, and between the insulating sheet and the electrode assembly 20. The gas storage structure 30 is either strip-shaped and attached or coated on the insulating sheet.

[0311] Combination Figure 17 and Figure 19 As shown in the fifth and sixth embodiments, the battery cell 100 is a long-blade battery or a short-blade battery, while Figure 17 In the middle, the baffle 411 may include a baffle 411 extending along the width direction of the lower plastic, and an air storage structure 30 may be provided in the limiting portion 42 adjacent to the second wall 10b in the length direction of the lower plastic, and fixed and limited by the baffle 411. Figure 19 In the middle, the baffle 411 may include a baffle 411 extending along the length direction of the lower plastic, and in the width direction of the lower plastic, a gas storage structure 30 may be provided in the limiting part 42 adjacent to the second wall 10b.

[0312] According to some embodiments of this application, electrode terminals 13 are provided on the first wall 10a and / or the second wall 10b, the second insulating member 40b is constructed as an insulating sheet, and the outer shell 10 is a prism.

[0313] like Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, in the first embodiment of this application, the battery cell 100 is constructed as a square battery, the end cap 11 defines a second wall 10b, the side of the battery and the large surface of the battery define a third wall 10c, an insulating sheet is located between the side of the battery and the electrode assembly 20, an insulating sheet is located between the large surface of the battery and the electrode assembly 20, and a gas storage structure 30 is provided at one end adjacent to the second wall 10b.

[0314] like Figure 14 As shown, in the fourth embodiment of this application, the battery cell 100 is constructed as a square battery, with the battery end face defining a first wall 10a, the battery side face and the battery large surface defining a third wall 10c, an insulating sheet located between the battery side face and the electrode assembly 20, an insulating sheet located between the battery large surface and the electrode assembly 20, and a gas storage structure 30 provided at one end adjacent to the second wall 10b.

[0315] Therefore, the utilization rate of other parts of the gap is higher, and more air storage structures 30 can be set to improve the air intake effect.

[0316] According to some embodiments of this application, the battery cell 100 is configured as an alkali metal battery.

[0317] It should be noted that existing alkali metal batteries generally use a vented top cover to expel the hydrogen gas generated inside the battery, thus protecting it. However, on the one hand, different types of alkali metal batteries (such as lithium metal and sodium metal batteries) have different chemical systems (electrolyte / positive electrode / negative electrode, etc.) and structural designs, resulting in significant differences in gas production rates and quantities. This necessitates vented top cover designs with varying permeability, increasing the manufacturing process and cost of the vented top cover. On the other hand, since a single alkali metal battery is often used as a single cell... Multiple alkali metal batteries are assembled into a battery device 200. Hydrogen gas from the alkali metal batteries is discharged into the housing 600 through a vented top cover, posing a risk of fire, flash explosion, and ignition to the wiring harness inside the battery device 200. Furthermore, due to the presence of the vented top cover, the alkali metal batteries are not completely sealed, making them prone to failure in special environments such as high temperature and high humidity. Moisture absorption can affect the performance of the alkali metal batteries, and the vented top cover is also the area with the lowest mechanical strength, making it prone to deformation and failure under pressure. All of these factors affect the lifespan of the alkali metal batteries.

[0318] Based on this, this application provides a gas storage structure 30 in the gap between the electrode assembly 20 and the housing 12. At least part of the gas storage structure 30 is hydrogen storage metal. The hydrogen storage metal can absorb a large amount of hydrogen produced by the alkali metal battery, so that the hydrogen can be absorbed at a low pressure level, that is, when there is very little hydrogen. The amount of hydrogen that can be absorbed and the absorption rate are much higher than those of the ventilated top cover. This can reduce the internal pressure of the alkali metal battery, reduce the risk of thermal runaway of the alkali metal battery, and extend the life of the alkali metal battery.

[0319] Furthermore, this application incorporates a hydrogen storage metal within the alkali metal battery, which can directly absorb the hydrogen gas produced by the alkali metal battery. This is applicable to various types of alkali metal batteries, reducing the probability of hydrogen gas escaping into the battery module or battery pack, further lowering the risk of thermal runaway. It also reduces the alkali metal battery's sensitivity to moisture, improves its mechanical strength, and ultimately extends its lifespan. In summary, the alkali metal battery embodiments of this application can reduce the internal pressure of the alkali metal battery, decrease the risk of thermal runaway, and extend its cycle life.

[0320] It is understandable that alkali metal batteries refer to batteries that achieve cycling by depositing and consuming alkali metals at the negative electrode. When preparing the negative electrode sheet, an alkali metal layer may be formed or may not be formed (a battery without a negative electrode). In addition, the active metals of alkali metal batteries are not limited to lithium, sodium, and potassium, but may also include other active metals such as zinc and aluminum.

[0321] It is understandable that hydrogen storage metal refers to an alloy that can react with hydrogen and thus absorb hydrogen. The reaction process between hydrogen storage metal and hydrogen is as follows: First, hydrogen is catalyzed and decomposed into hydrogen atoms on the surface of the hydrogen storage metal. Then, the hydrogen atoms enter the interior of the hydrogen storage metal lattice to generate metal hydrides, thus achieving the purpose of hydrogen storage.

[0322] Understandably, the material composition of the aforementioned hydrogen storage metal can be determined using an X-ray diffractometer.

[0323] In some embodiments of this application, under standard conditions, each gram of hydrogen storage metal can absorb 50 mL to 250 mL of hydrogen gas. For example, under standard conditions, the volume of hydrogen gas absorbed by each gram of hydrogen storage metal can be 50 mL to 240 mL, 100 mL to 200 mL, 150 mL to 179 mL, 155 mL to 175 mL, 160 mL to 170 mL, 165 mL to 170 mL, etc. This allows the hydrogen storage metal to absorb a relatively large amount of hydrogen, thus enabling sufficient absorption of hydrogen gas generated by the alkali metal battery even with a low amount of hydrogen storage metal added, reducing the internal pressure of the alkali metal battery, and extending its lifespan. In other embodiments, under standard conditions, each gram of hydrogen storage metal can absorb 50 mL to 180 mL of hydrogen gas.

[0324] As you can understand, standard temperature and pressure (STP), or simply "standard conditions" or "STP", refers to the conditions at 0°C and 101.325 kPa.

[0325] It is understood that "the volume of hydrogen that can be absorbed per gram of hydrogen storage metal under standard conditions" is a well-known definition in the art and can be determined using methods known in the art, such as the following methods:

[0326] Add 1g of hydrogen storage metal to the stainless steel sample chamber. Purge the alloy with hydrogen at a constant pressure of 5MPa for 2 hours. Then evacuate the sample for 30 minutes. Repeat the hydrogen purging-evacuation process at least three times to fully activate the hydrogen storage metal.

[0327] The amount of hydrogen absorbed by the alloy was determined using the H2PCT-1153 three-channel fully automated hydrogen storage material performance testing system (Yangzhou Yinghui Zhiyue).

[0328] According to some embodiments of this application, the electrode assembly 20 includes a negative electrode sheet, the negative electrode sheet includes a negative current collector and an active material layer disposed on at least one side of the negative current collector, the active material layer including an elemental active metal.

[0329] It can be understood that an active metal refers to a metal that can provide active metal ions. For example, the active metal in a lithium-alkali metal battery is elemental lithium, and the active metal in a sodium-alkali metal battery is elemental sodium. In this case, an alkali metal battery is included. Specifically, an alkali metal battery refers to a battery that uses an active metal as the negative electrode, such as lithium metal or sodium metal. In the above-mentioned types of alkali metal batteries, the active metal ions on the negative electrode, such as lithium and sodium, are relatively active and will undergo side reactions with water, solvents in the electrolyte, and residual alkali in the positive electrode active material, resulting in a large amount of gas production, and the proportion of H2 in the gas is >90%. For the above-mentioned batteries where the main gas produced is hydrogen, by setting a hydrogen storage metal in the battery, the hydrogen produced in the battery cell 100 is absorbed, reducing the internal pressure of the alkali metal battery, and the cycle life of the above-mentioned alkali metal battery is significantly improved.

[0330] According to some embodiments of this application, the active metal monomer includes at least one of lithium, sodium, potassium, zinc, or aluminum.

[0331] The active metal ions in the aforementioned alkali metal batteries are relatively reactive and will undergo side reactions with the electrolyte, producing a large amount of gas, with H2 accounting for >90% of the gas. For the aforementioned batteries that mainly produce hydrogen gas, by setting a hydrogen storage metal in the battery, the hydrogen gas produced in the battery can be absorbed, which is more effective in reducing the internal pressure of the alkali metal battery, and the cycle life of the aforementioned alkali metal batteries is significantly improved.

[0332] In some embodiments of this application, when a lithium metal negative electrode sheet is used, the preparation method is as follows: lithium foil or lithium metal alloy is coated onto the current collector by single-sided rolling, and then cut into negative electrode sheets.

[0333] For example, the alkali metal battery in this application embodiment is a sodium metal battery. When a sodium metal negative electrode sheet is used, its preparation method is as follows: sodium foil or sodium metal alloy is coated onto the current collector by single-sided rolling, and then cut into negative electrode sheets.

[0334] Of course, in other embodiments, the alkali metal battery of this application embodiment can also be constructed as a negative electrode-free battery, that is, there is no alkali metal in the negative electrode sheet. The prepared battery is called a negative electrode-free battery. By setting the interface modification layer, the active metal (alkali metal) can be uniformly deposited on the surface of the interface modification layer, thereby improving the cycle performance of the battery.

[0335] It's understandable that a "negative electrode-free battery" refers to a battery where no negative electrode active material is added during the battery manufacturing stage. However, a negative electrode current collector is still present. A negative electrode-free battery is simply a special type of alkali metal battery (such as lithium metal batteries or sodium metal batteries), not one that truly lacks a negative electrode. In actual operation, the negative electrode still contains an active metal (such as lithium metal or sodium metal). The negative electrode in a negative electrode-free battery includes a bare negative electrode current collector (such as copper). Taking a lithium battery as an example, during charging, active metal ions such as Li+ are released from the positive electrode and deposited on the negative electrode current collector, forming a lithium negative electrode. During subsequent battery discharge, the deposited lithium metal dissolves and is re-intercalated into the positive electrode.

[0336] According to some embodiments of this application, the electrolyte includes a solvent, which is configured as at least one of an ether solvent or an ester solvent.

[0337] First, it should be noted that this application does not impose specific restrictions on the type of electrolyte; it can be selected according to requirements. For example, the electrolyte can be liquid, gel, or completely solid.

[0338] It is understood that ether solvents refer to organic solvents containing ether groups, and ester solvents refer to organic solvents containing ester groups. Ether solvents and ester solvents have good compatibility with the hydrogen storage metal of the embodiments of this application, and hydrogen gas is generated during the cycling process of the alkali metal battery, which is absorbed by the hydrogen storage metal, reducing the internal pressure of the alkali metal battery and extending the life of the alkali metal battery.

[0339] According to some embodiments of this application, the ether solvent 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.

[0340] The aforementioned ether solvents are compatible with various alkali metal batteries, especially alkali metal batteries, and have good compatibility with the hydrogen storage metal of the present application embodiments. During the cycling process of the alkali metal battery, hydrogen gas is generated, which is absorbed by the hydrogen storage metal, reducing the internal pressure of the alkali metal battery and extending the life of the alkali metal battery.

[0341] In some embodiments of this application, the ester 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, or diethyl sulfone.

[0342] In some embodiments of this application, the hydrogen storage metal includes zirconium alloys, magnesium alloys, titanium alloys, vanadium alloys, or La. x Ni y M z At least one of the following, wherein M includes at least one of Zr, Mn, Mg, Zn, Al, Ti, Fe, Cu, Co, Y, Ca or Bi, 0 < x ≤ 2, 0 ≤ y ≤ 7, 0 ≤ z ≤ 3.

[0343] As an example, x can be 0.1-1.9, 0.3-1.7, 0.5-1.5, 0.8-1.3, 1-1.2, etc., and in some other embodiments of this application, 0.3≤x≤1.

[0344] y can be 1-6.9, 2-6, 3-5, etc. In some other embodiments of this application, 1≤y≤5.

[0345] z can be 0.1-2.9, 0.5-2.5, 1-2, etc., and in some other embodiments of this application, 0≤z≤1.

[0346] Among the aforementioned elements, Ti and Co can improve the lifespan and kinetics of hydrogen storage metals, Mg can enhance the hydrogen absorption capacity of hydrogen storage metals, Mn and Al can construct the framework of hydrogen storage metals and reduce costs, Y can reduce the hydrogen absorption plateau pressure of hydrogen storage metals, Fe, Ca and Bi can increase the hydrogen desorption plateau pressure of hydrogen storage metals, and Fe can increase the hydrogen absorption plateau pressure of hydrogen storage metals, while Cu can increase the hydrogen absorption rate of hydrogen storage metals.

[0347] In other embodiments of this application, M includes at least one of Al, Mn, Mg, Fe, Y, or Bi.

[0348] The aforementioned hydrogen storage metals have the characteristics of rapid hydrogen absorption, large hydrogen absorption capacity, wide hydrogen absorption boundary, and small volume expansion. They have excellent hydrogen absorption capacity, can absorb hydrogen gas generated by the battery, reduce the internal pressure of the alkali metal battery, reduce the risk of thermal runaway of the alkali metal battery, and extend the life of the alkali metal battery.

[0349] It is understandable that zirconium alloys refer to alloys containing zirconium, magnesium alloys refer to alloys containing magnesium, titanium alloys refer to alloys containing titanium, and vanadium alloys refer to alloys containing vanadium.

[0350] In some embodiments of this application, the titanium alloy includes at least one of TiNi, Ti2Ni, TiFe, or TiMn2. The above-mentioned titanium alloy has excellent hydrogen absorption capacity, which can absorb hydrogen gas generated by the battery, reduce the internal pressure of the alkali metal battery, reduce the risk of thermal runaway of the alkali metal battery, and extend the life of the alkali metal battery.

[0351] In some embodiments of this application, the magnesium alloy includes at least one of Mg2Ni, Mg2Cu, Mg2Co, Mg2Al, Mg2Cr or Mg2Te. The above-mentioned magnesium alloy has excellent hydrogen absorption capacity, which can absorb hydrogen gas generated by the battery, reduce the internal pressure of the alkali metal battery, reduce the risk of thermal runaway of the alkali metal battery, and extend the life of the alkali metal battery.

[0352] In some embodiments of this application, the zirconium alloy includes at least one of ZrV2, ZrCr2, or ZrMn2. The aforementioned zirconium alloy has excellent hydrogen absorption capacity, which can absorb hydrogen gas generated by the battery, reduce the internal pressure of the alkali metal battery, reduce the risk of thermal runaway of the alkali metal battery, and extend the life of the alkali metal battery.

[0353] In some embodiments of this application, the vanadium alloy includes V3TiNi. 0.56 M1 m The vanadium alloy with the above chemical formula has excellent hydrogen absorption capacity. It can absorb hydrogen gas generated by the battery, reduce the internal pressure of the alkali metal battery, reduce the risk of thermal runaway of the alkali metal battery, and extend the life of the alkali metal battery.

[0354] In some embodiments of this application, the hydrogen storage metal includes LaNi. 3.5 M2 x1 M3 y1 M4 z1 Where x1 is 0.2-0.6, y1 is 0-1, z1 is 0.3-0.9, x1+y1+z1=1.5, M2 includes at least one of Mn or Fe, M3 includes at least one of Zr, Ti or Y, and M4 includes at least one of Al, Mg, Ca or Bi.

[0355] As an example, x1 can be 0.2-0.59, 0.3-0.5, 0.4-0.45, etc., y1 can be 0-0.9, 0.1-0.8, 0.2-0.7, 0.3-0.6, 0.4-0.5, etc., and z1 can be 0.3-0.8, 0.4-0.7, 0.5-0.6, etc.

[0356] Specifically, lanthanide alloys have stable crystal structures and do not undergo other side reactions when reacting with hydrogen. Furthermore, the differences in atomic radii and electronegativity of different elements in the aforementioned hydrogen storage metals affect the unit cell volume of the hydrogen storage metal and the interaction force between hydrogen and metal atoms. Based on the differences in atomic radii and electronegativity of different elements, and through the combined action with transition metal atoms, the embodiments of this application can increase the hydrogen absorption capacity of the hydrogen storage metal, reduce the initial hydrogen absorption pressure, and improve the hydrogen release kinetics performance.

[0357] As an example, doping with transition metal M2 can reduce the hysteresis of hydrogen storage metals, while M3 and M4 can reduce the hydrogen absorption pressure of hydrogen storage metals, making it easier for them to absorb hydrogen. For instance, the doping element Ti has a particularly significant effect on improving the activation performance of hydrogen storage metals because Ti reacts with hydrogen before other phases during activation to form the TiH2 phase, causing cracks in the hydrogen storage metal and making it easier for hydrogen to enter the interior, effectively reducing the activation energy of the hydrogen storage metal. Through the combined effect of the above elements, the hydrogen storage capacity of the alloy can be increased, the initial hydrogen absorption pressure can be reduced, and the hydrogen release kinetics can be improved, making it easier for the hydrogen storage metal to absorb hydrogen and less likely to release it. This reduces the hydrogen content in the alkali metal battery, lowers the internal pressure of the alkali metal battery, and extends the battery's lifespan.

[0358] In some embodiments of this application, the hydrogen storage metal includes La. 0.5 Ni 4.5 Y 0.5 LaNi 3.5 Mn 0.2 YBi 0.3 LaNi 3.5 Mn 0.6 Y 0.4 Bi 0.5 LaNi 3.5 Mn 0.2 Y 0.4 Bi 0.9 LaTi 3.5 Fe 0.4 Zr 0.5 Bi 0.6 LaTi 3.5 Fe 0.4 Zr 0.5 Mg 0.6 LaNi 4.26 Al 0.08 Mg0.16 Or La 0.43 Y 0.57 Ni 4.5 Al 0.08 Mn 0.3 At least one of the above-mentioned hydrogen storage metals. The aforementioned hydrogen storage metals have excellent hydrogen storage capacity, low hydrogen absorption plateau pressure and high hydrogen release plateau pressure, which can effectively absorb hydrogen generated during the cycling process of alkali metal batteries, reduce the internal pressure of alkali metal batteries, and extend the life of alkali metal batteries.

[0359] Specifically, among the aforementioned hydrogen storage metals, at least one of Y or Fe elements is used, which can reduce the hydrogen absorption plateau pressure of the hydrogen storage metal. The molar ratio of La-site elements to other elements is less than 1:5. The high content of La-site elements results in a large amount of hydrogen absorption and a lower hydrogen absorption plateau pressure for the hydrogen storage metal.

[0360] This application does not limit the preparation method of the above-mentioned hydrogen storage metal. As an example, the preparation method of the above-mentioned hydrogen storage metal may be: mixing the metal elements corresponding to each element of the hydrogen storage metal in the molar ratio shown in the chemical formula, heating and melting under air-isolated conditions, and cooling to obtain the hydrogen storage metal.

[0361] Example 1

[0362] Preparation of hydrogen storage alloys:

[0363] Rare earth metals La, Ni, Mn, Y, and Bi were selected.

[0364] According to the molar ratio, the weighed bulk metal is placed in a zirconia crucible according to the designed process. The vacuum induction melting furnace is evacuated to a vacuum level of 1×10⁻⁶ before heating. -3 The pressure was increased to above 100 MPa; then, 0.05 MPa of inert argon gas was introduced into the furnace as a protective gas; the heating temperature was adjusted to 1500℃; the liquid alloy was held at the molten state for 5 minutes; then, the uniformly mixed liquid metal was poured into a copper mold, cooled to room temperature in the furnace, and removed to obtain the master alloy ingot LaNi. 3.5 Mn 0.2 YBi 0.3 The hydrogen storage alloy has a volume average particle size (Dv50) of 10 μm and a BET specific surface area of ​​1 g / cm³. 2 Its saturated aqueous solution has a pH of 10 at 25℃ and a tap density of 5 g / cm³. 3 The compacted density is 6 g / cm³. 3 .

[0365] The hydrogen storage alloy and the binder polytetrafluoroethylene (PTFE) were mixed at a mass ratio of 95:5, deionized water was added and stirred to disperse and form a slurry. The slurry was then coated onto a 20μm thick copper foil. After both sides were coated, the foil was dried, cold-pressed, slit, and sheeted to obtain a 100mm×20mm hydrogen storage alloy sheet (total thickness of 1.02mm, with a single-sided hydrogen storage alloy layer thickness of 0.5mm).

[0366] 1. Preparation of positive electrode sheet

[0367] Sodium-ion battery positive electrode active material (sodium iron pyrophosphate, residual alkali content of 0.5%), conductive agent (conductive carbon black), and binder (polyvinylidene fluoride) are mixed in a ratio of 90:5:5. Then, solvent (N-methylpyrrolidone, NMP) is added and stirred to disperse the mixture, thus preparing a positive electrode slurry. The positive electrode slurry is then coated onto Al foil using a double-sided, double-cavity coating device. After double-sided coating, the coating is dried, cold-pressed, slit, and the positive electrode sheet is obtained.

[0368] 2. Preparation of negative electrode sheet

[0369] Conductive carbon nanotubes and binder sodium carboxymethyl cellulose were added to water to form a slurry. The slurry was coated on a Cu foil with a thickness of 13 μm to form an interface modification layer, which was used as a Na deposition current collector. The single-sided coating thickness of the interface modification layer was 3 μm.

[0370] 3. Preparation of electrolyte

[0371] In an argon-filled glove box with a water content of <1ppm, NaPF6 was added to ethylene glycol dimethyl ether and stirred until homogeneous, resulting in an electrolyte with a NaPF6 concentration of 1.0 mol / L.

[0372] 4. Separating membrane

[0373] A polyethylene film with a thickness of 12 μm.

[0374] 5. Preparation of secondary batteries

[0375] The positive electrode, separator, and negative electrode are stacked in sequence, with the separator positioned between the anode and cathode to provide isolation. The electrode assembly 20 is then wound up and placed in the housing 12. Simultaneously, a hydrogen-absorbing alloy sheet is fixed to the underside of the top cover, adjacent to the tab 21, occupying the lower plastic position. After drying, electrolyte is injected at a rate of 4 g / Ah, leaving a residual space of 0.3 mL / Ah inside the housing 12. After formation and settling processes, a secondary battery is produced through further assembly, electrolyte injection, formation aging, and other steps.

[0376] The preparation methods of sodium-ion batteries in Examples 2-22 and Comparative Examples 1-3 are the same as those in Example 1, except that the process of preparing the hydrogen storage alloy is different. Examples 2-5 and 7-8 are adjusted according to the different elements and ratios of the hydrogen storage alloy compared to Example 1, as shown in Table 1.

[0377] In Comparative Example 1, no hydrogen storage alloy is prepared, and no hydrogen storage alloy is set in the secondary battery. In Comparative Example 2, the hydrogen absorption platform pressure of the hydrogen storage alloy set in the battery is not within the scope of this application. In Comparative Example 3, the residual space inside the shell 12 is not within the scope of this application.

[0378] Table 1

[0379]

[0380]

[0381] In Table 1, the hydrogen absorption pressure refers to the pressure at which the hydrogen storage alloy begins to absorb hydrogen, which is the minimum hydrogen absorption pressure.

[0382] The pressure-concentration isotherm (PCT) curve of the hydrogen storage alloy prepared in Example 1 was measured twice, with parallel sample 1 and parallel sample 2 used for the two measurements. The detailed test procedures for the two measurements are as follows:

[0383] The following measurements were taken using the H2PCT-1153 3-channel fully automated hydrogen storage material performance testing system (Yangzhou Yinghui Zhiyue):

[0384] Pressure sensors: 2 full-range absolute pressure sensors (0-10MPa) and 1 sensor (0-15MPa), with an accuracy of 0.04%FS; Temperature sensors: RT-100℃, RT-300℃, RT-500℃; The furnace can be programmed to heat up; The temperature sensors are placed outside the sample chamber; The sample chamber volume is (H15mm×12mm); The sample chamber and test pipeline are connected via quick connectors.

[0385] PCT curves and hydrogen absorption / desorption kinetics tests were conducted on the hydrogen storage material. Cylinder capacities: three 1000ml cylinders and three 150ml cylinders. The entire pipeline can withstand a pressure of 1×10⁻⁶. -6 The hydrogen pressure was -15 MPa. An Edwards vacuum pump (equipped with a hose, exhaust gas is discharged outdoors) was used. Test results are as follows: Figure 24 As shown, the hydrogen absorption plateau pressure of the hydrogen storage alloy in Example 1 is 0.2 MPa, and the minimum hydrogen absorption pressure is 0.008 MPa.

[0386] The hydrogen storage alloy sheet prepared in Example 1 was subjected to ion-polished cross-sectional morphology (CP) images obtained using a ZEISS Sigma 300 scanning electron microscope. Figure 25As can be seen, the hydrogen storage alloy sheet 100 includes a substrate 101 and a hydrogen storage alloy layer 102 disposed on the substrate.

[0387] The internal pressure of the secondary batteries prepared in Example 1 and Comparative Example 1 was measured using a built-in pressure sensor. The changes in internal pressure over time were obtained. Figure 26 As can be seen, the internal pressure of the battery in Example 1 of this application is always below 0.1 MPa, which is at a low level, while the internal pressure of the battery in Comparative Example 1, which did not add a hydrogen storage alloy, increases significantly over time.

[0388] The internal pressure of gas generation and thermal runaway performance of the secondary batteries of Examples 1-22 and Comparative Examples 1-3 were characterized, and the characterization results are shown in Table 2.

[0389] 1. Cyclic Gas Generation Internal Pressure Test: Arrange the pipes along the sealing nail welding holes of the secondary battery prepared above. The pipe diameter is the same as that of the sealing nail holes. Connect the oil gauge along the end of the pipe. Clamp the battery with two aluminum plates. Set the initial clamping force to 3000N. Calibrate three times, with an interval of 15 minutes between each time. Then charge and discharge the battery at 1C / 1C. The temperature of all battery bodies should be monitored and the oil gauge pressure should be recorded.

[0390] 2. Thermal runaway performance test:

[0391] (1) Before testing, fully charge the secondary battery according to the following procedure: charge to 4V at 0.33C.

[0392] (2) Record the battery's main voltage, internal resistance, and weight; inspect the appearance and take photos.

[0393] (3) Place the secondary battery in a high-temperature chamber using a 15mm steel clamp, raise the temperature from RT to 100℃ at 5℃ / min and hold for 1 hour, then raise the temperature at 5℃ / min until the battery body runs out of control, and hold for 30 minutes at 5℃ every 30 minutes.

[0394] (4) Monitoring video, voltage of the battery body, temperature of the positive terminal, negative terminal, center of the large surface, barcode of the battery body, and explosion-proof port.

[0395] (5) Measure the voltage, internal resistance, and weight; inspect the appearance and take photos.

[0396] (6) Provide an experimental report. If the secondary battery does not catch fire or explode, it passes the thermal runaway test. The results are shown in Table 2.

[0397] Table 2

[0398]

[0399]

[0400] As can be seen from Table 2, in Examples 1-22 of this application, based on the alkali metal battery...

[0401] The pressure, residual space, and partial pressure of hydrogen within the casing 12 can be considered when adding a specific hydrogen storage metal to an alkali metal battery. This can reduce the internal pressure of the alkali metal battery and decrease the risk of thermal runaway. Compared to Examples 1-22, the alkali metal battery in Comparative Example 1 does not use a hydrogen storage metal, the hydrogen absorption platform pressure of the hydrogen storage metal in the battery of Comparative Example 2 is outside the range of this application, and the residual space inside the casing 12 of Comparative Example 3 is outside the range of this application. Therefore, the internal pressure of the alkali metal battery is higher, and the risk of thermal runaway is higher.

[0402] like Figure 2 As shown, this application proposes a battery device 200, including: the battery cell 100 in the above embodiment.

[0403] According to the battery device 200 of the present application embodiment, a battery cell 100 is provided inside the housing 600, and a gas storage structure 30 is integrated inside the battery cell 100. The internal pressure of the battery cell 100 is more stable, and less hydrogen is emitted into the housing 600 during operation. This not only improves the service life of the battery device 200, but also improves the safety and reliability of the battery device 200 and reduces safety hazards.

[0404] like Figure 3 As shown, this application provides an electrical device 300, including: the battery device 200 in the above embodiment.

[0405] See appendix Figure 2 The battery device 200 has a housing 600, and battery cells 100 can be arranged in an array within the housing 600. In embodiments where the battery cells 100 are configured as square batteries in the vertical direction of the housing 600, the battery cells 100 can be arranged with end caps 11 facing upward within the housing 600, and the gas storage structure 30 can be disposed between the end caps 11 and the electrode assembly 20, or disposed within the end caps 11. Alternatively, the battery cells 100 can be arranged with their battery sides facing upward within the housing 600, and the gas storage structure 30 can be disposed between the first side plate and the electrode assembly 20, or between the first side plate defining the second wall 10b near the end caps 11 and the electrode assembly 20. Alternatively, the battery cells 100 can be arranged with their battery sides facing upward within the housing 600, and the gas storage structure 30 can be disposed between the second side plate and the electrode assembly 20, or between the second side plate defining the second wall 10b near the end caps 11 and the electrode assembly 20.

[0406] Of course, the battery cell 100 can also be constructed as a cylindrical battery, with the axis of the cylindrical battery parallel to the vertical direction, and a gas storage structure 30 can be set inside the end cap 11 located on the top of the cylindrical battery.

[0407] The following reference Figures 5-23 The battery cell 100 of the embodiments of this application will be described in detail.

[0408] First embodiment:

[0409] like Figure 5 , Figure 6 , Figure 7 , Figure 8 and Figure 9 As shown, in the first embodiment, the battery cell 100 is constructed as a square battery, the second wall 10b leads out the electrode terminal 13 and is defined by the end cap 11, the third wall 10c is the side of the battery and the large surface of the battery, the first insulating member 40a is the lower plastic and the second insulating member 40b is the insulating sheet.

[0410] The lower plastic has a accommodating cavity 41 in the limiting part 42 at both ends, and an exhaust channel facing the explosion-proof part 14 on the lower plastic. An electrode tab space is formed between the lower plastic and the electrode assembly 20. The electrode tab space includes a gap area b and a folded electrode tab area a. A gas storage structure 30 is set in the accommodating cavity 41, the exhaust channel, the gap area b and the folded electrode tab area a. A gas storage structure 30 is also set between the insulating sheet and the third wall 10c and between the insulating sheet and the electrode assembly 20.

[0411] Second embodiment:

[0412] like Figure 10 and Figure 11 As shown, in the second embodiment, the battery cell 100 is constructed as a square battery, the third wall 10c leads out the electrode terminal 13, and the second wall 10b is defined by the large surface of the battery. The third wall 10c is defined by the end cap 11. The first insulating member 40a is an insulating sheet, and the second insulating member 40b is a lower plastic.

[0413] The lower plastic has a accommodating cavity 41 in the limiting part 42 at both ends, and an electrode tab space is formed between the lower plastic and the electrode assembly 20. The electrode tab space includes a gap region b and a folded electrode tab region a. The gas storage structure 30 is provided in the accommodating cavity 41 and the gap region b adjacent to the second wall 10b. Gas storage structures 30 are also provided between the insulating sheet and the second wall 10b and between the insulating sheet and the electrode assembly 20.

[0414] like Figure 12 and Figure 13 As shown, in the third embodiment, the battery cell 100 is constructed as a square battery, the third wall 10c leads out the electrode terminal 13, and the second wall 10b is defined by the side of the battery. The third wall 10c is defined by the end cap 11. The first insulating member 40a is an insulating sheet, and the second insulating member 40b is a lower plastic.

[0415] The lower plastic has a accommodating cavity 41 in the limiting part 42 at both ends, and an electrode tab space is formed between the lower plastic and the electrode assembly 20. The electrode tab space includes a gap region b and a folded electrode tab region a. The gas storage structure 30 is provided in the accommodating cavity 41 and the gap region b adjacent to the second wall 10b. Gas storage structures 30 are also provided between the insulating sheet and the second wall 10b and between the insulating sheet and the electrode assembly 20.

[0416] like Figure 14 and Figure 15 As shown, in the fourth embodiment, the battery cell 100 is constructed as a square battery, the first wall 10a leads out the electrode terminal 13, the first insulating member 40a and the second insulating member 40b are both constructed as insulating sheets, and gas storage structures 30 are provided between the insulating sheet and the second wall 10b, between the insulating sheet and the third wall 10c, and between the insulating sheet and the electrode assembly 20, and the gas storage structure 30 between the third wall 10c and the electrode assembly 20 is located adjacent to the second wall 10b.

[0417] like Figure 16 and Figure 17 As shown, in the fifth embodiment, the battery cell 100 is constructed as a short-blade battery or a long-blade battery, the third wall 10c leads out the electrode terminal 13, the large surface of the battery defines the second wall 10b, the second insulating member 40b is constructed as lower plastic, and the first insulating member 40a is constructed as an insulating sheet.

[0418] The lower plastic has limiting portions 42 at both ends of its length. Each limiting portion 42 has a receiving cavity 41. The receiving cavity 41 has a baffle 411 extending along the width direction of the lower plastic. The baffle 411 divides the lower plastic into multiple cavities. One or more cavities adjacent to the second wall 10b are provided with a gas storage structure 30. Gas storage structures 30 are also provided between the second wall 10b and the insulating sheet, and between the insulating sheet and the electrode assembly 20.

[0419] like Figure 18 and Figure 19 As shown, in the fifth embodiment, the battery cell 100 is constructed as a short-blade battery or a long-blade battery, the third wall 10c leads out the electrode terminal 13, the side of the battery defines the second wall 10b, the second insulating member 40b is constructed as lower plastic, and the first insulating member 40a is constructed as an insulating sheet.

[0420] The lower plastic has limiting portions 42 at both ends of its length. Each limiting portion 42 has a receiving cavity 41. The receiving cavity 41 has a baffle 411 extending along the length of the lower plastic. The baffle 411 divides the lower plastic into multiple cavities. A gas storage structure 30 is provided in one or more cavities adjacent to the second wall 10b. Gas storage structures 30 are also provided between the second wall 10b and the insulating sheet, and between the insulating sheet and the electrode assembly 20.

[0421] like Figure 20As shown, in the sixth embodiment, the battery cell 100 is constructed as a short-blade battery or a long-blade battery, the third wall 10c leads out the electrode terminal 13, the side of the battery or the large surface of the battery defines the second wall 10b, and the first insulating member 40a is constructed as an insulating sheet.

[0422] Among them, a gas storage structure 30 is also provided between the second wall 10b and the insulating sheet, and between the insulating sheet and the electrode assembly 20.

[0423] like Figure 21 and Figure 22 As shown, in the seventh embodiment, the battery cell 100 is constructed as a cylindrical battery, the second wall 10b leads out the electrode terminal 13, and the end cap 11 defines the second wall 10b. The first insulating member 40a is constructed as a lower plastic.

[0424] The end cap 11 has multiple limiting parts 42, and each of the multiple limiting parts 42 is equipped with a gas storage structure 30.

[0425] Other configurations and operations of the battery cell 100, battery device 200, and power consumption device 300 according to the embodiments of this application are known to those skilled in the art and will not be described in detail here.

[0426] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0427] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery cell, characterized in that, include: Outer shell (10); An electrode assembly (20) is housed within the housing (10), and a gap is formed between the electrode assembly (20) and the housing (10); The electrolyte is contained within the housing (10), a portion of the electrolyte is immersed within the electrode assembly (20), and a portion of the electrolyte is contained within a portion of the gap; A gas storage structure (30) is housed within the outer casing (10), the gas storage structure (30) being at least partially located in the other part of the gap, and at least part of the gas storage structure (30) being a hydrogen storage metal.

2. The battery cell as described in claim 1, characterized in that, The outer casing (10) includes a first wall (10a) and a second wall (10b), which are disposed opposite to each other. The first wall (10a) supports the electrode assembly (20), and at least a portion of the gap is formed between the second wall (10b) and the electrode assembly (20). At least a portion of the gas storage structure (30) is disposed between the electrode assembly (20) and the second wall (10b).

3. The battery cell according to claim 2, characterized in that, A first insulating element (40a) is provided between the second wall (10b) and the electrode assembly (20); The gas storage structure (30) is disposed between the first insulating member (40a) and the second wall (10b), and / or, the gas storage structure (30) is disposed between the first insulating member (40a) and the electrode assembly (20).

4. The battery cell according to claim 3, characterized in that, The second wall (10b) faces the side surface of the first insulating member (40a), and / or the side surface of the first insulating member (40a) facing the second wall (10b) is connected to the gas storage structure (30), and / or the electrode assembly (20) faces the side surface of the first insulating member (40a), and / or the side surface of the first insulating member (40a) facing the electrode assembly (20) is connected to the gas storage structure (30).

5. The battery cell according to claim 3, characterized in that, An electrode space is formed between the first insulating member (40a) and the electrode assembly (20), the electrode space accommodating the electrode (21), and at least a portion of the gas storage structure (30) is provided in the electrode space.

6. The battery cell according to claim 5, characterized in that, The electrode space includes: a folded electrode region (a) accommodating the electrode (21) and a void region (b) located around the folded electrode region (a), at least a portion of the gas storage structure (30) is disposed in the folded electrode region (a), and / or the void region (b).

7. The battery cell according to claim 6, wherein, The gas storage structure (30) is provided in the gap between adjacent tabs (21) in the tab region (a) and / or in the gap between the tab (21) and the outer shell (10).

8. The battery cell according to claim 3, characterized in that, The first insulating member (40a) has a receiving cavity (41) which is open to the side facing the second wall (10b) and / or to the side facing the electrode assembly (20) to receive the gas storage structure (30), and the receiving cavity (41) is in communication with the gap.

9. The battery cell according to claim 8, characterized in that, The first insulating member (40a) includes a limiting portion (42) that protrudes toward the electrode assembly (20), and the receiving cavity (41) is formed in the limiting portion (42).

10. The battery cell according to claim 3, characterized in that, The second wall (10b) is provided with an explosion-proof element (14), which is configured to break when the pressure inside the housing (10) reaches a set condition to release the gas inside the housing (10). The first insulating element (40a) has a connecting portion for connecting the internal space of the housing (10) with the explosion-proof element (14), and at least a portion of the gas storage structure (30) is disposed in the connecting portion.

11. The battery cell according to claim 10, characterized in that, The connecting portion is constructed as a connecting groove (c) formed on the first insulating member (40a), the connecting groove (c) extending along the side surface of the first insulating member (40a) facing the electrode assembly (20) to the side surface of the first insulating member (40a) away from the electrode assembly (20).

12. The battery cell according to claim 3, characterized in that, The gas storage structure (30) includes: a shell (31) and a gas storage material (32) filled in the shell (31), at least a portion of the gas storage material (32) is a hydrogen storage metal, the gas storage material (32) is configured as granules or powder, the shell (31) has vent holes formed on it, and the vent hole diameter is smaller than the particle size of the gas storage material (32), the shell (31) is connected to the second wall (10b), the first insulating member (40a) or the electrode assembly (20).

13. The battery cell according to claim 12, characterized in that, The cover shell (31) has a connecting adhesive layer on at least one side surface, which is connected to at least one of the following: the surface of the second wall (10b) facing the first insulator (40a), the surface of the first insulator (40a) facing the second wall (10b), the side surface of the first insulator (40a) facing the electrode assembly (20), and the side surface of the electrode assembly (20) facing the second wall (10b).

14. The battery cell according to claim 3, characterized in that, The gas storage structure (30) includes: a gas storage material (32), at least a portion of which is a hydrogen storage metal, the gas storage material (32) being configured as granules or powder, and the gas storage material (32) being coated on at least one of the following: the surface of the second wall (10b) facing the first insulator (40a), the surface of the first insulator (40a) facing the second wall (10b), the side surface of the first insulator (40a) facing the electrode assembly (20), and the side surface of the electrode assembly (20) facing the second wall (10b).

15. The battery cell according to claim 3, wherein, The gas storage structure (30) includes: a gas storage material (32), at least a portion of which is a hydrogen storage metal. The gas storage structure (30) is constructed in a sheet or block shape, and the gas storage material is disposed on at least one of the following: the surface of the second wall (10b) facing the first insulating member (40a), the surface of the first insulating member (40a) facing the second wall (10b), the side surface of the first insulating member (40a) facing the electrode assembly (20), and the side surface of the electrode assembly (20) facing the second wall (10b).

16. The battery cell according to any one of claims 3-15, characterized in that, The first wall (10a) or the second wall (10b) is provided with an electrode terminal (13), and the electrode assembly (20) is provided with a tab (21) on the side facing the electrode terminal (13), or the electrode assembly (20) is provided with a tab (21) on the side adjacent to the electrode terminal (13).

17. The battery cell according to any one of claims 3-15, characterized in that, The second wall (10b) is provided with electrode terminals (13), the first insulating member (40a) is made of plastic, and the outer shell (10) is a cylinder or prism.

18. The battery cell according to claim 3 or 4, characterized in that, The first wall (10a) is provided with electrode terminals (13), the first insulating element (40a) is constructed as an insulating sheet, and the outer shell (10) is a cylinder or prism.

19. The battery cell according to claim 3 or 4, characterized in that, The outer shell (10) is provided with a third wall (10c), which is connected to the first wall (10a) and the second wall (10b) respectively. Electrode terminals (13) are provided on the third wall (10c). The first insulating member (40a) is constructed as an insulating sheet, and the outer shell (10) is a prism.

20. The battery cell according to claim 2, characterized in that, The outer casing (10) is provided with a third wall (10c), which is connected to the first wall (10a) and the second wall (10b) respectively, and at least part of the gas storage structure (30) is disposed between the third wall (10c) and the electrode assembly (20).

21. The battery cell according to claim 20, characterized in that, A second insulating element (40b) is provided between the third wall (10c) and the electrode assembly (20), and the gas storage structure (30) is disposed between the second insulating element (40b) and the third wall (10c), and / or, the gas storage structure (30) is disposed between the second insulating element (40b) and the electrode assembly (20).

22. The battery cell according to claim 21, characterized in that, The third wall (10c) has a side surface facing the second insulating member (40b), and / or, the side surface of the second insulating member (40b) facing the third wall (10c) is connected to the gas storage structure (30), and / or, the electrode assembly (20) has a side surface facing the second insulating member (40b), and / or, the side surface of the second insulating member (40b) facing the electrode assembly (20) is connected to the gas storage structure (30).

23. The battery cell according to claim 21, characterized in that, The second insulating member (40b) has a receiving cavity (41) which is open to the side facing the third wall (10c) and / or to the side facing the electrode assembly (20) to receive the gas storage structure (30), and the receiving cavity (41) is in communication with the gap.

24. The battery cell according to claim 23, characterized in that, The second insulating member (40b) includes a limiting portion (42) that protrudes toward the electrode assembly (20), and the receiving cavity (41) is formed in the limiting portion (42).

25. The battery cell according to claim 21, characterized in that, An electrode space is formed between the second insulating member (40b) and the electrode assembly (20), the electrode space accommodating the electrode (21), and at least a portion of the gas storage structure (30) is provided in the electrode space.

26. The battery cell according to claim 25, characterized in that, The electrode space includes: a folded electrode region (a) that accommodates the electrode (21) and a void region (b) located around the folded electrode region (a), with at least a portion of the gas storage structure (30) disposed in the void region (b).

27. The battery cell according to any one of claims 20-26, characterized in that, The gas storage structure (30) located between the third wall (10c) and the electrode assembly (20) is disposed adjacent to the second wall (10b), and the maximum distance between it and the second wall (10b) is less than or equal to 5 mm.

28. The battery cell according to claim 21, characterized in that, The gas storage structure (30) includes: a shell (31) and a gas storage material (32) filled in the shell (31), at least a portion of the gas storage material (32) is a hydrogen storage metal, the gas storage material (32) is configured as granules or powder, the shell (31) has vent holes formed on it, and the vent hole diameter is smaller than the particle size of the gas storage material (32), the shell (31) is connected to the third wall (10c), the second insulating member (40b) or the electrode assembly (20).

29. The battery cell according to claim 28, characterized in that, The cover shell (31) has a connecting adhesive layer on at least one side surface, which is connected to at least one of the following: the surface of the third wall (10c) facing the second insulator (40b), the surface of the second insulator (40b) facing the third wall (10c), the side surface of the second insulator (40b) facing the electrode assembly (20), and the side surface of the electrode assembly (20) facing the third wall (10c).

30. The battery cell according to claim 21, characterized in that, The gas storage structure (30) includes: a gas storage material (32), at least a portion of which is a hydrogen storage metal, the gas storage material (32) being configured as granules or powder, and the gas storage material (32) being coated on at least one of the surface of the third wall (10c) facing the second insulating member (40b), the surface of the second insulating member (40b) facing the third wall (10c), a side surface of the second insulating member (40b) facing the electrode assembly (20), and a side surface of the electrode assembly (20) facing the third wall (10c).

31. The battery cell according to claim 21, characterized in that, The gas storage structure (30) includes: a gas storage material (32), at least a portion of which is a hydrogen storage metal. The gas storage structure (30) is constructed in a sheet or block shape, and the gas storage material is disposed on at least one of the following: the surface of the third wall (10c) facing the second insulating member (40b), the surface of the second insulating member (40b) facing the third wall (10c), the side surface of the second insulating member (40b) facing the electrode assembly (20), and the side surface of the electrode assembly (20) facing the third wall (10c).

32. The battery cell according to any one of claims 20-26, characterized in that, The third wall (10c) is provided with an electrode terminal (13), and the electrode assembly (20) is provided with a tab (21) on the side facing the electrode terminal (13), or the electrode assembly (20) is provided with a tab (21) on the side adjacent to the electrode terminal (13).

33. The battery cell according to any one of claims 21-26, characterized in that, The third wall (10c) is provided with electrode terminals (13), the second insulating member (40b) is made of plastic, and the outer shell (10) is a prism.

34. The battery cell according to claim 21, characterized in that, Electrode terminals (13) are provided on the first wall (10a) and / or the second wall (10b), the second insulating member (40b) is constructed as an insulating sheet, and the outer shell (10) is a prism.

35. The battery cell according to claim 1, characterized in that, The battery cell (100) is configured as an alkali metal battery.

36. The battery cell according to claim 35, characterized in that, The electrode assembly (20) includes a negative electrode sheet, which includes a negative current collector and an active material layer disposed on at least one side of the negative current collector, the active material layer including an elemental active metal.

37. A battery device, characterized in that, include: The battery cell (100) according to any one of claims 1-36.

38. An electrical device, characterized in that, include: The battery device (200) according to claim 37.

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